Qualification: 
Ph.D, MSc
sreedevikmenon@am.amrita.edu

Dr. Sreedevi K. Menon received her Bachelors and Masters degree from Mahatma Gandhi University, Kerala India. She completed her Ph. D. degrees and Cochin University of Science and Technology, Kerala, India in the area of Microwave Engineering in 2008.

She has one international and one national patent in her credit. She was awarded with Senior Research Fellowship (SRF) by the Council for Scientific and Industrial Research (CSIR), Government of India. She has worked in projects funded by Department of Science and Technology, Vikram Sarabhai Space Centre, Polarizone Technologies and Wireless People, Malayasia during her tenure of work as a research associate at Cochin University of Science and Technology. She joined the Department of Electronics and Communication Engineering at Amrita School of Engineering, Amritapuri Campus, India, in July 2010. She has authored/co-authored more than 100 International Journals and conference proceedings.

Publications

Publication Type: Conference Paper

Year of Publication Title

2019

M. Muraleedharan and Dr. Sreedevi K Menon, “Isolation Enhancement of Two Element Array using Microstrip Resonator”, in 2019 3rd International Conference on Trends in Electronics and Informatics (ICOEI), Tirunelveli, India, India, 2019.[Abstract]


In an antenna array the isolation between individual elements is crucial to enhance reflection and radiation properties. This paper presents a simple and efficient method to enhance isolation between the array elements without disturbing the antenna performance. This is achieved by the introduction of planar resonators in between the array elements which acts as an open circuit for the field thus reducing mutual coupling between the patches enhancing isolation. A novel meander line resonator is proposed in this paper for improvement of isolation. An isolation of 26 dB is obtained in a 2 element array at 2.45 GHz using the proposed resonator. Detailed study of electric field and current distribution gives understanding about the working of the proposed resonator for reducing mutual coupling between the array elements. Initially simulations are carried out in HFSS software and then the prototype of the optimized design is fabricated and validated using Vector Network Analyser.

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2019

, S, B. Nair, and Dr. Sreedevi K Menon, “Miniaturization of Monopole Antenna with Modified Ground for Wi-Fi Applications”, in 4thInternational Conference on Devices, Circuits and Systems (ICDCS), Coimbatore, 2019.

2018

C. Anupriya and Dr. Sreedevi K Menon, “Open circuited microstrip resonators for passive RFID applications”, in 2018 2nd International Conference on Inventive Systems and Control (ICISC), Coimbatore, India, 2018.[Abstract]


This paper presents open circuited transmission lines electromagnetically coupled with microstrip line for RFID applications. Two simple configurations of transmission line is considered for band stop response and extended as multi-resonator system for passive RFID tag. The proposed resonators provide compact resonators with good transmitter and receiver characteristics. The resonators optimized by HFSS is fabricated and tested using Vector Network Analyzer.

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2018

B. S.D., George, B., and Dr. Sreedevi K Menon, “Parametric study of stub loaded loop resonator”, in 2018 4th International Conference on Devices, Circuits and Systems (ICDCS), 2018.

2018

D. Mohan, Jwala, A., Sreekumar, M., Krishnan, T. B., and Dr. Sreedevi K Menon, “Realization of Band Stop Filter using Perturbed Microstrip Line”, in 2018 Second International Conference on Inventive Communication and Computational Technologies (ICICCT), Coimbatore, India, 2018.[Abstract]


This paper presents a microstrip line loaded with open loop resonators (OLRs) for filter applications. The filter characteristics is achieved by including open loop resonator (OLR) as etched pattern on the microstrip line (MSL), thus making it a Perturbed Microstrip Line (PML). The effect of increasing the number of perturbations in the MSL is also analyzed. With a dielectric constant of 4.4, the bandwidth and frequency of the design is measured to experimentally confirm the validity of the result. The effectiveness of the proposed PML filter as passive 3 bit RFID tag is also studied. The proposed band stop filter can be widely used in communication system and space technology, especially mobile and satellite communication due to its better performance and compactness.

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2018

U. Krishnan, Muralidharan, A., Krishnan, B., and Dr. Sreedevi K Menon, “Isolation Enhancement of Patch Antenna Array Using Open Loop Resonator”, in 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI), 2018.

2018

S. Muralidharan and Dr. Sreedevi K Menon, “CPW fed Compact Dual Band Monopole Antenna for Wi-Fi Applications”, in 2018 3rd International Conference on Communication and Electronics Systems (ICCES), 2018.

2018

R. Deepak and Dr. Sreedevi K Menon, “Design and Analysis of Compact Bandstop Filter using Perturbed Microstrip Line”, in 2018 IEEE MTT-S International Microwave and RF Conference (IMaRC), Kolkata, India, India, 2018.[Abstract]


A perturbation or disturbance in the microstrip line manipulates the current flow through the transmission line thus modifying its performance as a filter. This modified microstrip line - Perturbed Microstrip Line (PMSL) provides bandstop filter characteristics in the frequency spectrum. The perturbation is provided as a Complementary Spiral Resonator (CSR). The paper includes analysis of this system and also design equations are furnished. The proposed filter is fabricated and validated for the performance.

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2018

Meenu L and Dr. Sreedevi K Menon, “Study on the Effect of Feeding Mechanism in the Frequency Response of OLR”, in 2018 2nd International Conference on Inventive Systems and Control (ICISC), 2018.[Abstract]


Planar resonator structures play a vital role in wireless communication systems. The characteristics of resonators depend upon its structure and its feeding mechanism. Each variation in the geometric structure and the feeding mechanism leads to the change in the characteristics of the entire system. In this paper, there is a detailed analysis of planar square open loop resonator (OLR) with different structured electromagnetically coupled feeding techniques. The design analyses of each resonator structures are done at 2.45GHz. Depending on the response needed and compactness either one of the five energizing techniques will be used

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2018

K. A, S, A., and Dr. Sreedevi K Menon, “Compact Low Cost Passive RFID Tag for Object Tracking”, in International Conference on Advances in Computing, Communications and Informatics (ICACCI 2018), Banglore, 2018.

2018

Betsy George, Bhuvana, N. S., and Dr. Sreedevi K Menon, “Compact band pass filter using triangular open loop resonator”, in 2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), Singapore, Singapore, 2018.[Abstract]


Recent developments in wireless communication challenges microwave filters with more demanding requirements such as small size, light weight, high performance and low cost. Microstrip resonator have the higher performance than the conventional filtering technique for microwave devices. A triangular open loop resonator energized using electromagnetic (EM) and edge coupling is presented in this paper. Microstrip line is modified as a triangular open-loop resonator that introduces additional capacitance and inductance by re-orientation of electromagnetic field, there by selecting the operating frequencies. Depending on the type of coupling and position of the feed used the operating frequency of the filter changed for the same dimensions. EM and edge coupling is given to the resonator, when its gives band pass filters at 2.45 GHz and the effect of each coupling techniques are studied in detail. Better size reduction is observed for EM coupling than the edge coupling. The filters characteristics are analyzed in substrate FR4 epoxy by using ANSYS High Frequency Structure Simulator (HFSS) software. The design equations for the resonator predicts the frequency with less than 2% error with the simulated frequency. The optimized triangular open loop resonators are fabricated and validated using Keysight ENA 5080A Vector network Analyser. The simulated and measured of the resonator filter are comparable for center frequency, bandwidth, return loss and attenuation.

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2018

Betsy George, Nair, S. B., and Dr. Sreedevi K Menon, “Investigations on edge coupled metamaterial filters”, in 2017 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET), Chennai, India, 2018.[Abstract]


Artificially engineered materials, like metamaterials can be used to enhance the performance of devices. Split-ring resonators (SRRs) is the most widely used metamaterial at microwave regime. In this paper, edge coupled metamaterial filter using SRR with band stop characteristics in the frequency spectrum is proposed. Exhaustive simulations are conducted to understand the properties of the filter. The effects of the geometrical parameters on the resonance frequency are investigated. The proposed filter prototypes are tested using Vector Network Analyser and thus simulated results are validated.

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2018

Meenu L, S. Aiswarya, and Dr. Sreedevi K Menon, “Asymmetric coplanar waveguide fed monopole antenna with perturbed ground plane”, in 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), St. Petersburg, Russia, 2018.[Abstract]


Present work proposes an Asymmetric Coplanar (ACPW) fed antenna providing wide band and omnidirectional radiation. Gain enhancement is achieved by the introducing perturbations on the shorted ground plane. The proposed antenna offers a 2 :1 VSWR bandwidth of 741 MHz at 5.2 GHz with the enhanced gain of 6.4 dBi. The parametric analysis and optimization of the antenna is done by using ANSYS HFSS. Optimized prototype is analyzed experimentally using Keysight E5080A Vector Network Analyzer. The proposed antenna will have wide range of applications in different wireless communication systems

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2018

V. M. Jayakrishnan and Dr. Sreedevi K Menon, “Circular microstrip patch assisted planar crossover for GPS application”, in 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), St. Petersburg, Russia, 2018.[Abstract]


For efficient monitoring and tracking of vehicles, aircraft or ships GPS (Global Positioning System) satellite based navigation system plays an inevitable role. For long range GPS communication and tracking, high gain antennas usually array antennas are preferred. Realized using butler matrix phased array antennas are potential candidate for providing long range communication providing directional beam. Butler matrix provides equal amplitude to the antennas by means of hybrid coupler, necessary beam orientation using phase shifter and ensures signal purity when transmission lines overlap by crossover circuit. Thus crossover will mitigate the GPS tracking of signal when transmission lines overlap each other maintaining high SNR. This paper focuses on the investigations of an L band planar crossover realised using microstrip technology. The crossover characteristics like transmission and isolation are analysed in detail. For enhancing the isolation between the decoupled ports, parent crossover is further modified maintaining good transmission between coupled ports. The analysis is done using ANSYS HFSS and the optimised crossover is fabricated on FR4 substrate and measurements are taken by using Keysight ENA 5080A Vector Network Analyser. The simulated and measured results are in good agreement with each other. This proposed crossover is the possible solution for long range wireless communication and GPS Applications.

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2018

Meenu L, S. Aiswarya, and Dr. Sreedevi K Menon, “Compact Monopole Antenna with Metamaterial ground plane”, in Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), 2017, Singapore, 2018.[Abstract]


An antenna is an integral component in a wireless communication system. The choice of the antenna geometry of these systems depends on the preferred specifications. Depending upon the variation in the geometry and feeding technique, the performance of the antenna can be modified. For any communication system design an antenna with a better transmission range, improved reflection and radiation characteristics at the designed frequencies is desired. An asymmetric coplanar strip fed antenna is designed and analyzed in this paper. This structure gives better performance compared to microstrip and coplanar waveguide (CPW) fed omni-directional antennas. The proposed antenna is compact with reduced complexity, providing appreciable gain. A monopole antenna system with a metamaterial ground plane on the same plane is proposed. This antenna operates in the 2.45 GHz Wi-Fi band. The radiating element and the metamaterial ground plane are optimized for the best performance of the antenna system. For optimum performance of the antenna, open loop resonator is also studied as the ground plane. Miniaturization is achieved with metamaterial ground plane without changing the characteristic of the monopole antenna structure. The monopole antenna with the metamaterial ground plane is found to be compact with resonance at 2.45 GHz offering a 2 : 1 VSWR bandwidth of 217 MHz. The radiation pattern of the designed antenna is omni-directional with a gain of 3.124 dBi at the resonant frequency. The antenna is designed and optimized using ANSYS HFSS 14. The optimized antennas are fabricated using FR4 substrate and are experimentally validated using Vector Network Analyzer E5080A.

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2017

M. Ranjith, S. Aiswarya, and Dr. Sreedevi K Menon, “High isolation diplexer for rf circuits using loop resonators”, in 2017 International Conference on Advances in Computing, Communications and Informatics (ICACCI), Udupi, India, 2017.[Abstract]


A high isolation Diplexer with Pentagonal Open Loop Resonators (P-OLR) is presented in this paper. The Diplexer contains two resonators providing pass bands in the desired frequency, thus attaining significant size reduction. The P-OLR offers several design freedoms, such as the pass band frequency can be adjusted by properly tuning its geometrical parameters and its bandwidth can be controlled through changing the coupling coefficients between the T-shaped feed and the resonator. To verify the designed method a P-OLR diplexer operating at the Wi-Fi bands is successfully designed and fabricated on FR4 epoxy. The maximum insertion loss of two pass bands is 1.5 dB and the isolation between channels at the pass bands higher than 25 dB.

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2017

A. S. Mol, S. Aiswarya, and Dr. Sreedevi K Menon, “Study of an electromagnetically coupled resonator energized using U-shaped microstrip feed”, in 2017 International Conference on Advances in Computing, Communications and Informatics (ICACCI), Udupi, India, 2017.[Abstract]


Resonators can be energized using different feeding mechanisms. The effect of U-shaped Microstrip feed electromagnetically coupled to an open loop resonator is presented in this paper. The proposed feeding mechanism induces a band-stop response for the resonator. The band-stop filter optimized by simulation is fabricated and tested using Keysight E 5080 A Vector Network Analyzer. The measured results shows the filter to have resonance at 2.7 GHz with 430 MHz bandwidth. A simplified equivalent circuit model for the proposed design is also presented. The results obtained by simulation, equivalent circuit and experiment are in consensus with each other. This feeding technique can be used to energize other type of resonators as well.

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2017

J. Rajendran and Dr. Sreedevi K Menon, “An equivalent circuit model for a compact OLRR based notch filter”, in 2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), Singapore, Singapore, 2017.[Abstract]


In this paper, a simple, equivalent circuit model for characterizing an open loop rectangular resonator (OLRR) based notch filter is proposed. The OLRR is placed within a U-shaped microstrip line assuring effective coupling between the OLRR and the transmission line. OLRR exhibits electric and magnetic coupling, when placed in close proximity to microstrip line. If the electric and magnetic coupling could be modelled using inductors and capacitors, a more accurate model considering the effect of coupling gap and width of the feed line could be developed. The circuit model is based on methods used to model spiral inductors in monolithic microwave integrated circuits. The S parameters of the filter and the equivalent circuit model are simulated. The simulation results are compared with that of measured results and the results are in good agreement in the frequency range 2 GHz to 6 GHz. The geometric parameters are varied and the resonant frequency of the filter (fr) is compared with that predicted by the equivalent circuit model (feq). The average deviation Δf, the difference of fr and feq is a few 100 MHz. Results reveal that the proposed equivalent model can be used to predict the notch frequency of the filter accurately.

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2017

S. Aiswarya, Sreerag, C., Aravind, A., and Dr. Sreedevi K Menon, “Microstrip multiple resonator assisted passive RFID tag for object tracking”, in 2017 2nd International Conference on Communication and Electronics Systems (ICCES), Coimbatore, India, 2017.[Abstract]


Radio Frequency Identification (RFID) tag using microstrip resonator for object tracking is presented in this paper. The passive tag is realized using half wave open circuited Microstrip lines. Effective use of each resonator as 4 bit RFID tag is demonstrated. The resonators are optimized by HFSS and is validated by measurements of the realized prototypes. The tag design is completed with inclusion of an omni-directional antenna as transmitter and receiver along with the resonators. The range of the proposed tag is also measured experimentally in indoor environment.

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2017

S. Aiswarya, Ranjith, M., and Dr. Sreedevi K Menon, “Passive RFID tag with multiple resonators for object tracking”, in 2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), Singapore, Singapore, 2017.[Abstract]


A comparative study of the realization of 4 bit passive chipless resonator for RFID tag section using 4 resonators and 8 resonators is discussed in this paper. The designed 4 bit passive chipless RFID resonator tag can detect up to 15 objects. Basic resonator is a complementary spiral with direct coupling to the microstrip line (MSL), operating in the L band region. A 4 bit resonator structure using 4 complementary spirals and 8 complementary spirals are designed. The resonance obtained depends upon the length, width and gap of the spiral structure. The 4 bit resonator structure using 8 complementary spirals is twice the duplication of the 4 bit resonator using 4 complementary spirals. The operating frequencies of both the structures are almost the same. The 4 bit resonator structure using 8 complementary spirals gives the amplified version of the signal provided by 4 complementary spirals thus adding range and security to the system. Both the 4 bit spiral resonator structures were simulated using ANSYS HYSS 14. The optimized resonators are fabricated on FR4 substrate and simulated results are validated using Keysight E5080A ENA Vector Network Analyser.

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2017

Dr. Sreedevi K Menon and Donelli, M., “Compact CPW filter with modified signal line”, in 2017 IEEE Applied Electromagnetics Conference (AEMC), Aurangabad, India, 2017.[Abstract]


The design and implementation of a Coplanar Waveguide (CPW) band rejection filter with modified signal line is presented in this paper. In particular, the modification is created as a spiral etched in the signal line which perturbs the surface current on the line, providing additional capacitance and inductance that reflects as the band stop characteristics in the frequency spectrum. A filter prototype has been designed fabricated, numerically and experimentally assessed. The obtained results, as well as the agreement between numerical and experimental are quite good

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2017

Betsy George, Sreeja.S.D, B., and Dr. Sreedevi K Menon, “Energy Harvesting using Metamaterial Filters”, in 2017 International Conference on Intelligent Sustainable Systems (ICISS), 2017.[Abstract]


In modern scenario, energy production without pollution at low cost is a critical task. This paper presents an efficient way to harvest energy from the unused received microwave signals. In communication systems, band stop filters are generally used to reject the unwanted signals to get a better signal to noise ratio. The rejected signals can be converted into useful DC power with the help of energy harvesting systems. The DC power generated thus can be utilized to maintain the power requirements of the receiver system or more attractively for the remotely placed wireless sensor systems where powering the system is crucial. For rejecting the signals an edge coupled metamaterial filter with cover type feed is proposed in this paper. With the help of a Vector Network Analyzer, the proposed filter prototypes are tested and the simulated results are validated

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2017

M. L. Liya, Jayakrishnan, V. M., and Dr. Sreedevi K Menon, “Investigations on Microstrip Patch as Band Pass Filter”, in 2017 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET), 2017.[Abstract]


Effective utilization of microstrip patch antennas as filter is studied in this paper. Microstrip antennas of square geometry is extended as band pass filter. The parent filter is modified with Sierpinski fractals for enhancement of characteristics. The proposed filters are optimized for performance using ANSYS HFSS. Prototypes of the optimized filters are tested and the measured results are found to be in good agreement with the simulated one.

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2017

Betsy George, A, S. Mol, and Dr. Sreedevi K Menon, “Microstrip Resonator as Microfluidic Sensor for Blood-Glucose Monitoring ”, in 2nd International Conference on Communication and Electronics Systems (ICCES 2017), 2017.

2017

Betsy George, ,, and Dr. Sreedevi K Menon, “Compact Bandpass Filter Using Triangular Open-Loop Resonator”, in Electromagnetics Research Symposium (PIERS), Singapore, 2017.

2017

Meenu L and Dr. Sreedevi K Menon, “Reducing Electromagnetic radiation Hazards Using Resonators”, in 2017 IEEE International Conference on Smart Technologies and Management for Computing, Communication, Controls, Energy and Materials (ICSTM), 2017.[Abstract]


Summary form only given. Strong light-matter coupling has been recently successfully explored in the GHz and THz [1] range with on-chip platforms. New and intriguing quantum optical phenomena have been predicted in the ultrastrong coupling regime [2], when the coupling strength Ω becomes comparable to the unperturbed frequency of the system ω. We recently proposed a new experimental platform where we couple the inter-Landau level transition of an high-mobility 2DEG to the highly subwavelength photonic mode of an LC meta-atom [3] showing very large Ω/ωc = 0.87. Our system benefits from the collective enhancement of the light-matter coupling which comes from the scaling of the coupling Ω ∝ √n, were n is the number of optically active electrons. In our previous experiments [3] and in literature [4] this number varies from 104-103 electrons per meta-atom. We now engineer a new cavity, resonant at 290 GHz, with an extremely reduced effective mode surface Seff = 4 × 10-14 m2 (FE simulations, CST), yielding large field enhancements above 1500 and allowing to enter the few (<;100) electron regime. It consist of a complementary metasurface with two very sharp metallic tips separated by a 60 nm gap (Fig.1(a, b)) on top of a single triangular quantum well. THz-TDS transmission experiments as a function of the applied magnetic field reveal strong anticrossing of the cavity mode with linear cyclotron dispersion. Measurements for arrays of only 12 cavities are reported in Fig.1(c). On the top horizontal axis we report the number of electrons occupying the topmost Landau level as a function of the magnetic field. At the anticrossing field of B=0.73 T we measure approximately 60 electrons ultra strongly coupled (Ω/ω- ||

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2016

S. Nikhila, Mohandas, P., Durga, P., and Dr. Sreedevi K Menon, “Asymmetric Coplanar Waveguide-Fed Monopole Antenna with SRR in the Ground Plane”, in Proceedings of the Second International Conference on Computer and Communication Technologies, New Delhi, 2016.[Abstract]


In this paper, a compact Asymmetric Coplanar Waveguide (ACPW)-fed monopole antenna with Split Ring Resonator (SRR) in the ground plane is presented. Inclusion of SRR in the ground plane of ACPW offers a considerable bandwidth enhancement. SRR and Complementary SRR (CSRR) in the ground plane of ACPW are analyzed and bandwidth enhancements of 37.4 and 21.5 % at 2.52 GHz are obtained respectively, in comparison with ACPW-fed monopole antenna. The antennas offer an omni-directional pattern. Peak Gain of the antenna is found to be ~2 dBi for all the configurations in the frequency band of interest.

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2016

N. S. Bhuvana and Dr. Sreedevi K Menon, “OLR-filtenna for Wi-Fi applications”, in 2016 Progress in Electromagnetic Research Symposium (PIERS), Shanghai, China, 2016.[Abstract]


Microstrip open loop resonators with annular or square configuration are widely used in the design of filters and antennas. In this paper a new compact microstrip OLR based filters are designed and analyzed. This filter configuration is extended to work as a filter antenna. Proposed filtenna consists of a microstrip open loop resonator (OLR) based narrow band pass filter and antenna which operates at 2.45 GHz. Filtenna is designed on Fr4 substrate with OLR and microstrip patch on a plane and a uniform ground plane on other face of the substrate. The combination of OLR and microstrip gives a high Q band pass response and offers better coupling characteristics. The tuning of the antenna operating frequency is achieved by changing the operating band of the filter. The optimum performance is achieved when the antenna resonant frequency encompasses with the band pass frequency of the filter. The electrical property of the proposed structure is investigated analyzed and optimized numerically by using the method of moments in ANSYS High Frequency Structure Simulator (HFSS).

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2016

V. Jayakrishnan and Dr. Sreedevi K Menon, “Modified circular patch antenna based crossover for beamforming applications”, in 2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT), 2016.

2016

S. Joseph, P, R. Lal, and Dr. Sreedevi K Menon, “Substrate integrated waveguide based antenna with bi-directional radiation for radar applications”, in 2016 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET), Chennai, India, 2016.[Abstract]


The paper presents a novel substrate integrated waveguide (SIW) based antenna with bi-directional radiation. The peak gain of the antenna is 5dBi in both the beams. The beams are placed 180° with each other having a half power beam width in both the lobes. Bidirectional radiation is achieved by incorporating slots in specific orientation on SIW. The reported antenna finds its applications in radars, mobile communication, satellite communication, etc.

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2016

V. S. A. Krishna, Sadasivam, S., Sreeram, P. R., and Dr. Sreedevi K Menon, “Analysis and design of direct coupled metamaterial filters for wireless communication”, in 2016 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT), Kumaracoil, India, 2016.[Abstract]


The paper presented analysis the effect of direct coupling on metamaterial based resonators. Split ring resonator (SRR) and Open loop resonator (OLR) offering band stop characteristics are studied using Keysight ADS. The resonator parameters are optimized for performance a 2.45 GHz Wi-Fi band enabling it for Wireless communication applications. The paper also furnishes design equations for the proposed filters.

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2016

A. S. Mol and Dr. Sreedevi K Menon, “Electromagnetically coupled band pass filter with multiple hairpin resonators”, in 2016 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT), Kumaracoil, India, 2016.[Abstract]


This paper introduces electromagnetically coupled hairpin resonator with band pass response in the frequency spectrum. The filter is optimized for low pass band insertion loss, high band stop rejection and good frequency selectivity. The influence of multiple resonators in the filter characteristics is also analyzed. The proposed filters are suitable for wireless communication systems.

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2016

P. G and Dr. Sreedevi K Menon, “Microstrip patch based high isolation planar crossover for beamforming applications”, in 2016 IEEE International WIE Conference on Electrical and Computer Engineering (WIECON-ECE), Pune, India, 2016.[Abstract]


In this paper, a microstrip patch is extended to form planar crossover by suitably choosing the feed locations for orthogonal polarizations. The overlap is modified as a hexagonal patch which offers an isolation of -35 dB at 2.4 GHz. Crossover is a part of butler matrix, which is finds applications in beamforming networks. The proposed crossover is compared for reflection and transmission characteristics and compactness with rectangular and circular crossover at same frequency.

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2016

R. Lal P and Dr. Sreedevi K Menon, “High gain Substrate Integrated Waveguide based slot antenna using Circular Cavity Array”, in 2016 IEEE International WIE Conference on Electrical and Computer Engineering (WIECON-ECE), Pune, India, 2016.[Abstract]


The paper deals with design and analysis of a Substrate Integrated Waveguide (SIW) based antenna by providing an Array of Circular Cavity. The cavity is allowed to radiate by providing Half-Ring Shaped Slots on the surface. Based on the analysis, a Peak Gain of 10.5dBi is obtained at a frequency of 19.6GHz for a 4 element array.

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2016

A. Shruthi and Dr. Sreedevi K Menon, “Design and analysis of modified Log Periodic Dipole Antenna with enhanced gain”, in 2016 Progress in Electromagnetic Research Symposium (PIERS), Shanghai, China, 2016.[Abstract]


Advanced wireless communication applications demands antennas with enhanced radiation properties over a wide bandwidth. Log Periodic Dipole Antenna array (LPDA) is a new class of antennas that provide constant radiation properties over a wide bandwidth. In this paper, modified planar log periodic antennas are proposed which assure an enhanced gain of 15 dBi at 2.45 GHz. Two designs of LPDA are analysed which provide provide enhanced gain and highly directive radiation pattern over a bandwidth 1 GHz to 9 GHz.

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2016

N. C. Babu and Dr. Sreedevi K Menon, “Analysis of hexagonal Split Ring Resonator”, in 2016 Progress in Electromagnetic Research Symposium (PIERS), Shanghai, China, 2016.[Abstract]


Split Ring Resonator (SRR) is found to be an effective filter at microwave frequencies. Different geometries of SRR can be designed to provide filter characteristics in frequency spectrum. In this paper a novel hexagonal SRR which provides band pass characteristics is presented. Different geometric parameters that influence the filter characteristics are analyzed in detail to derive at the optimum design at 2.45 GHz. The electrical property of the proposed filter is investigated in ANSYS High Frequency Structure Simulator (HFSS).

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2016

N. C. Babu and Dr. Sreedevi K Menon, “Design of a Open loop resonator based filter Antenna for WiFi applications”, in 2016 3rd International Conference on Signal Processing and Integrated Networks (SPIN), Noida, India, 2016.[Abstract]


In this paper, an Open loop resonator based filter Antenna is presented. The proposed antenna is a combination of Square open loop resonator with a rectangular patch. The filter is designed to have a pass band at 2.45GHz. The influence of geometric parameters on filter characteristics is studied in detail. The antenna is placed as a second resonator, thus combining filtering and radiating functions. As the antenna resonant frequency encompasses with the filter band pass, the antenna characteristics are not altered. The proposed structure is of reduced size and cost effective as two components are combined together. The variation of filter and antenna characteristics with geometric parameters are analyzed and optimized results are obtained.

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2016

D. M. Vijayan and Dr. Sreedevi K Menon, “Direction of arrival estimation in smart antenna for marine communication”, in 2016 International Conference on Communication and Signal Processing (ICCSP), 2016.[Abstract]


A communication link between fishing vessels or with the sea shore using Wi-Fi is explored in this paper. For effective communication a high gain antenna is mounted at the sea shore which acts as base station (BS). Although narrow band directional antenna used in the Base Station (BS) ensures the connectivity for a long distance, the coverage will be poor without any steering mechanism, as the antenna beam is fixed in a particular direction. The proposed smart antenna with adaptive beamforming and multiple access technique can ensure the coverage without losing connectivity at long distance. The main objective is to find the Direction of Arrival (DoA) of the received signal from the fishing vessel moving at a constant velocity for adaptive steering of the antenna beam. The DoA parameter gives the phase and amplitude of the signal transmitted from the fishing vessel. The same phase and amplitude help to calculate the beam forming vectors in the smart antenna and it adaptively steers the beam towards fishing vessel. This paper describes how DoA estimation can apply to a beam forming Wi-Fi antenna array which is used for marine communication, and give a mathematical model of DoA estimation. More »»

2016

V. M. Jayakrishnan and Dr. Sreedevi K Menon, “Circular patch antenna based planar crossover”, in 3rd International Conference on Signal Processing and Integrated Networks, SPIN 2016, 2016, pp. 250-254.[Abstract]


In this paper, a planar crossover derived from circular patch with two orthogonal sets of feed is presented. The electrical length of the microstrip circular patch antenna is increased by incorporating slots at the center achieving area reduction and better isolation in comparison with parent crossover. The proposed crossovers are analyzed using ANSYS HFSS, and an isolation better than -22 dB and transmission ∼0 dB is observed at the frequency range of operation. The proposed crossover is the potential candidate for Butler Matrix in Beamforming applications. © 2016 IEEE.

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2016

K. C. Jayakrishnan, S. Nair, B., and Dr. Sreedevi K Menon, “Analysis of Metamaterial based band pass filter”, in 3rd International Conference on Signal Processing and Integrated Networks, SPIN 2016, Noida, India, 2016, pp. 232-235.[Abstract]


In this paper, Metamaterials based microstrip filter is presented. Two configurations - Open Loop Resonator (OLR) filter and Split Ring Resonator (SRR) is used to design a band pass filter. Resonators are energized using direct coupling and the effect of the geometrical parameters on the filter characteristics are analyzed in detail. The proposed filter is a potential candidate for filter antenna applications. © 2016 IEEE.

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2016

D. M. Vijayan, M, A., and Dr. Sreedevi K Menon, “Patch loaded CPW fed monopole antenna”, in 2016 3rd International Conference on Signal Processing and Integrated Networks (SPIN), 2016, pp. 246-249.[Abstract]


The effect of patch loading on Coplanar Waveguide (CPW) fed monopole antenna is analyzed in this paper. For gain enhancement, different geometrically shaped patches are loaded on the monopole antenna. The pentagonal shaped patch is found to offer better gain in comparison with other geometries studied. The gain enhancement is obtained without deteriorating other antenna characteristics. More »»

2016

V. M. Jayakrishnan, Dr. Sreedevi K Menon, J., M., and J., J., “Realization of Butlermatrix for Beamforming in Phased Array System”, in Procedia Computer Science, 2016, vol. 93, pp. 223-229.[Abstract]


In phased array system for producing multi-beams, equal power with different phase has to be fed to the antenna system. The necessary phase difference is provided by a digital circulatory or by a transmission line modified as butler matrix. In this paper a 4 x 4 butler matrix using microstrip line is realized for adequate phase difference. Butler matrix consist of a 3 dB coupler, crossovers and phase shifter. 3 dB coupler ensures equal power is fed to the antenna system while crossover maintains signal purity whenever transmission lines overlap. Phase shifter provides necessary phase shift need for beam formation in desired direction. Each of these devices is analyzed separately using ANSYS HFSS and optimized design is fabricated and tested. The optimized designs of individual components is combined together to realize the butler matrix. © 2016 Published by Elsevier B.V.

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2015

G. Lalu, Lekshmy, B. S., Narayanan, G., and Dr. Sreedevi K Menon, “Design and development of on-chip coplanar strip open loop resonator filter”, in 2015 2nd International Conference on Signal Processing and Integrated Networks (SPIN), Noida, India, 2015.[Abstract]


In this paper, a compact on chip band stop filter (BSF) using open loop resonator (OLR) integrated on silicon substrate is proposed. The BSF can be fabricated using the CMOS process without any additional steps thus making the filter cost effective in fabrication. The effect of additional layers in the filter characteristics is also presented. The proposed filter has a bandwidth of 4.3 GHz and has a stopband attenuation of -30 dB. The filter is 8.6×4×0.525 mm3 in size and can be fabricated using simple CMOS process flow.

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2015

M. T. Mehta, A, N. K., Rajan, V., Pillai, R., and Dr. Sreedevi K Menon, “Planar crossover for beamforming networks using Sierpenski gaskets”, in 2015 International Conference on Control Communication Computing India (ICCC), Trivandrum, India, 2015.[Abstract]


In this paper, a planar symmetric 4 port crossover formed from a square patch antenna with two sets of orthogonal feeds is presented. The operating frequency of the crossover is decided by the square patch. Electrical length of patch antenna is varied by summing various slots with alternative designs and sizes achieving frequency shift to lower side. The slots introduced are of different geometries like square, circle and diamond which are based on the Sierpenski gasket with a 3 phase of iteration in. This results in isolation better than 21 dB, transmission 0dB for third iteration at the operating frequency. The proposed design can be used in beam forming networks and butler matrix.

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2015

S. A, S, B. Nair, and Dr. Sreedevi K Menon, “ACPW fed onchip band stop filter for filtenna applications”, in 2015 IEEE Applied Electromagnetics Conference (AEMC), Guwahati, India, 2015.[Abstract]


Revolutionary growth in communication systems leads to the need for low cost, miniaturized RF microwave components. In Radio Frequency Integrated Circuit (RFIC), stacking of oxide layers, which is inevitable during the fabrication process, has great effect on the performance of the designed component. In this paper, the effect of incorporating gate oxide layer in filter characteristics is analysed. The filter is realized using Asymmetric coplanar waveguide with Defected Ground Structures (DGS). The reflection and transmission characteristics of the proposed filter are analysed with each additional layers, and the best design is fabricated.

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2015

B. S Nair, Das, A. T., and Dr. Sreedevi K Menon, “On chip ACPW fed monopole antenna”, in 2nd International Conference on Signal Processing and Integrated Networks (SPIN), 2015 , 2015.[Abstract]


The increasing demand of communication systems has emphasized on low cost and small RF/Microwave transceiver. In this paper a compact Asymmetric Coplanar Waveguide (ACPW) fed monopole antenna is designed and fabricated on high resistivity silicon (HR-Si). Being uni-planar in nature the proposed antenna is a potential candidate for Microwave Monolithic Integrated Circuits (MMIC). For transreceivers fabricated on silicon chip using CMOS technology, this antenna doesn't need additional steps in process flow for fabrication. ACPW fed monopole antenna provides impedance bandwidth of 250 MHz at 1.8 GHz with a gain of ~ 2 dBi in the entire band with an Omni directional radiation pattern.

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2015

B. S. Lekshmy, Lalu, G., Narayanan, G., and Dr. Sreedevi K Menon, “Analysis of dual-band hairpin resonator filter”, in 2nd International Conference on Signal Processing and Integrated Networks, SPIN 2015, 2015, pp. 655-658.[Abstract]


In this paper, analysis of a dual-band filter using hairpin resonator is presented. By geometrical modifications of a hairpin resonator, bands stop and band pass characteristics are observed in the frequency spectrum. The variations of the geometrical parameters have been studied in detail and optimized for best filter performance. © 2015 IEEE.

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2015

J. Jesmi Alphonsa, R. Anand, and Dr. Sreedevi K Menon, “A coplanar Pentagonal Antenna for wireless communication”, in 2nd International Conference on Signal Processing and Integrated Networks, Noida, India, 2015.[Abstract]


Investigation of a coplanar pentagonal antenna is presented in this paper. The antenna offers a bandwidth of 9.48 % at 2.53 GHz with a gain of 4.39 dBi. The antenna has an omnidirectional radiation pattern. The advantage of coplanar antenna is that active circuitry can be mounted easily making it applicable for Monolithic Microwave Integrated Circuit applications (MMIC). The results are compared with a Bow-Tie antenna with the same substrate at same frequency.

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2011

Dr. Sreedevi K Menon and , “ Survey and Measurements on Digital Microwave Communication in Southern Railways Emerging trends in VLSI, Embedded and Nano Technologies”, in NCEVENT 2011, 2011.

2011

Dr. Sreedevi K Menon and , “ Survey and Measurements on Digital Microwave Communication in Southern Railways”, in International Conference on Communication and Electronics Information (ICCEI 2011), 2011.

2011

Dr. Sreedevi K Menon, Sasikumar, S., .Lalu, G., .Nair, V., and P, A. A., “Design and Development of on Chip Open Loop Resonator Filter”, in International Conference on Microwaves, Antennas, Propagation & Remote Sensing ICMARS-2011, 2011.

2010

Dr. Sreedevi K Menon and .Mohanan, P., “Design of a Coplanar waveguide filter with DGS ground plane”, in IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE 2010), 2010.

2005

M. N. Suma, Dr. Sreedevi K Menon, Bijumon, P. V., Sebastian, M. T., and Mohanan, P., “Experimental investigation on rectangular dielectric resonator antenna excited by conductor backed coplanar waveguide”, in 2005 IEEE Antennas and Propagation Society International Symposium, Washington, DC, USA, 2005.[Abstract]


The radiation and resonance characteristics of a rectangular dielectric resonator antenna excited by a conductor backed coplanar waveguide are presented in this paper. The effect of CPW dimensions on the performance of the antenna configuration is experimentally studied. The position and orientation of the dielectric resonator on the feed line is optimized for maximum bandwidth and gain. The present design offers a bandwidth of 7.9% with broad beamwidth and low cross polarization discrimination better than -35 dB.

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2005

Dr. Sreedevi K Menon, Lethakumary, B., Aanandan, C. K., Vasudevan, K., and Mohanan, P., “A novel EBG structured ground plane for microstrip antennas”, in 2005 IEEE Antennas and Propagation Society International Symposium, Washington, DC, USA, 2005.[Abstract]


A simple electromagnetic band gap (EBG) structure consisting of cross-shapes etched in the ground plane of microstrip transmission line is presented. Microstrip antenna characteristics on employing this EBG structure as ground plane are also studied.

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2004

Dr. Sreedevi K Menon, “Session A: Antenna”, in ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004., Nanjing, China, 2004.[Abstract]


Presents the table of contents of the proceedings

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2004

S. Mridula, Paul, B., Dr. Sreedevi K Menon, Aanandan, C. K., Vasudevan, K., Mohanan, P., Bijumon, P. V., and Sebastian, M. T., “Wideband rectangular dielectric resonator antenna for W-LAN applications”, in National radio science meeting, 2004.

Publication Type: Journal Article

Year of Publication Title

2019

M. Donelli, Manekiya, M., and Dr. Sreedevi K Menon, “Compact microstrip reconfigurable filter based on spiral resonators”, Microwave and Optical Technology Letters, vol. 61, pp. 417-424, 2019.[Abstract]


In this work, the design of a reconfigurable stop-band filter based on a set of spiral microstrip resonators is proposed. In particular, a set of spiral resonators able to reject different Wi-Fi channels are activated or deactivated by means of electronic switches based on pin diodes. A filter prototype composed of five resonating elements and coupled with a microstrip was fabricated and experimentally assessed. Good performances have been verified experimentally, with reference to the filter reject capabilities. The numerical and experimental results are in good agreement. © 2018 Wiley Periodicals, Inc.

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2018

K. Susan Johnson and Dr. Sreedevi K Menon, “Compact CPW Fed Dual Band Omni directional Antenna with Modified Signal Strip”, 2018 Second International Conference on Advances in Electronics, Computers and Communications (ICAECC), pp. 1-4, 2018.[Abstract]


A dual band planar monopole antenna energized using Coplanar Waveguide (CPW) is presented in this paper. The dual band characteristic is achieved by modifying the signal strip of CPW as two different monopoles. The newly developed antenna is resonating at two different frequencies, 2.4GHz and 5.2GHz, making it suitable for Wi-Fi applications. The properties of the antenna such as return loss, gain and radiation pattern are analyzed and optimized using ANSYS HFSS and validated by measurement. The simple structure is the attracting feature of the designed antenna.

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2018

J. Rajendran and Dr. Sreedevi K Menon, “A multiband self-complementary SRR loaded dipole antenna”, Microwave and Optical Technology Letters, vol. 60, pp. 1842-1847, 2018.[Abstract]


Abstract In this article, a novel self-complimentary, split ring resonator-loaded dipole antenna (SCSDA) is proposed, which could be used in L and S bands. The proposed antenna consists of U-shaped dipoles loaded with split ring resonators. Along with the dipoles, SRRs excites additional resonances yielding multi-band operation. The measured average gain is 7 dBi across the bandwidth for the antenna. The measured results confirm that SCSDA is a multiband antenna and can be a good candidate for L and S band applications.

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2018

G. D. Gupta, Dey, G., Mg, S., Ramalingam, B., Shameer, K., Thottacherry, J. Jose, Kalappurakkal, J. Mathew, Howes, M. T., Chandran, R., Das, A., Dr. Sreedevi K Menon, Parton, R. G., Sowdhamini, R., Thattai, M., and Mayor, S., “Correction: Population Distribution Analyses Reveal a Hierarchy of Molecular Players Underlying Parallel Endocytic Pathways.”, PLoS One, vol. 13, no. 9, p. e0204770, 2018.[Abstract]


Single-cell-resolved measurements reveal heterogeneous distributions of clathrin-dependent (CD) and -independent (CLIC/GEEC: CG) endocytic activity in Drosophila cell populations. dsRNA-mediated knockdown of core versus peripheral endocytic machinery induces strong changes in the mean, or subtle changes in the shapes of these distributions, respectively. By quantifying these subtle shape changes for 27 single-cell features which report on endocytic activity and cell morphology, we organize 1072 Drosophila genes into a tree-like hierarchy. We find that tree nodes contain gene sets enriched in functional classes and protein complexes, providing a portrait of core and peripheral control of CD and CG endocytosis. For 470 genes we obtain additional features from separate assays and classify them into early- or late-acting genes of the endocytic pathways. Detailed analyses of specific genes at intermediate levels of the tree suggest that Vacuolar ATPase and lysosomal genes involved in vacuolar biogenesis play an evolutionarily conserved role in CG endocytosis.

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2018

P. Rönmark, Jagorstrand, B., Safioti, G., Dr. Sreedevi K Menon, and Bjermer, L., “Comparison of correct technique and preference for Spiromax®, Easyhaler® and Turbuhaler®: a single-site, single-visit, crossover study in inhaler-naïve adult volunteers.”, Eur Clin Respir J, vol. 5, no. 1, p. 1529536, 2018.[Abstract]


Many patients do not use inhalers correctly. Inhalers associated with good technique have the potential to improve symptom control and are often preferred by patients. Inhaler-naïve, adult volunteers were randomized to use empty Spiromax®, Easyhaler®, and Turbuhaler® dry powder inhalers (DPIs) in one of six possible sequences in this single-site, single-visit, crossover study conducted in Sweden. Randomization was stratified by age and gender. Participants attempted to use each device intuitively (no instructions) and after reading the instructions for use from the patient information leaflet. Device preference was surveyed after using all devices. Mastery of device handling (i.e. dose preparation) or inhalation was defined as having no healthcare-professional-observed errors. The primary endpoint was mastery of device handling after reading the instructions. More participants mastered device handling with Spiromax vs Easyhaler or Turbuhaler, both intuitively (44%, 0%, and 10%, respectively) and after reading the instructions (99%, 56%, and 81%, respectively). Fewer participants had ≥1 device-handling error with Spiromax than with the other devices. The percentage of participants still showing inhalation errors after reading the instructions ranged between 21% for Spiromax and 40% for Easyhaler. After reading instructions, mastery of handling and inhalation was numerically lower among older (aged >60 years) vs younger participants across all devices. Most participants preferred Spiromax for device handling (59%) and intuitiveness/ease of use (61%). These findings highlight that important differences exist between DPI devices, which could have implications for disease control when selecting a device for a patient.

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2018

M. Manekiya, Donelli, M., Kumar, A., and Dr. Sreedevi K Menon, “A Novel Detection Technique for a Chipless RFID System Using Quantile Regression”, Electronics, vol. 7, p. 409, 2018.[Abstract]


This work presents a novel approach for improving the detection capabilities of a chipless Radio Frequency Identification (RFID) system based on quantile regression. The main drawback of chipless RFID systems is the limited response of the tags due to the low-quality factor of the resonators, used to encode the information in the tag. The detection becomes very challenging especially for real-time data when noise is present. This work proposes the use of quantile regression to enhance the system performance. A chipless RFID system prototype has been fabricated (as a proof of concept) and experimentally assessed. The obtained results are quite satisfactory in the potentialities of the proposed methodology.

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2018

P. Dhumale, Dr. Sreedevi K Menon, Chiang, J., and Püschel, A. W., “The loss of the kinases SadA and SadB results in early neuronal apoptosis and a reduced number of progenitors.”, PLoS One, vol. 13, no. 4, p. e0196698, 2018.[Abstract]


The neurons that form the mammalian neocortex originate from progenitor cells in the ventricular (VZ) and subventricular zone (SVZ). Newborn neurons are multipolar but become bipolar during their migration from the germinal layers to the cortical plate (CP) by forming a leading process and an axon that extends in the intermediate zone (IZ). Once they settle in the CP, neurons assume a highly polarized morphology with a single axon and multiple dendrites. The AMPK-related kinases SadA and SadB are intrinsic factors that are essential for axon formation during neuronal development downstream of Lkb1. The knockout of both genes encoding Sad kinases (Sada and Sadb) results not only in a loss of axons but also a decrease in the size of the cortical plate. The defect in axon formation has been linked to a function of Sad kinases in the regulation of microtubule binding proteins. However, the causes for the reduced size of the cortical plate in the Sada-/-;Sadb-/- knockout remain to be analyzed in detail. Here we show that neuronal cell death is increased and the number of neural progenitors is decreased in the Sada-/-;Sadb-/- CP. The reduced number of progenitors is a non-cell autonomous defect since they do not express Sad kinases. These defects are restricted to the neocortex while the hippocampus remains unaffected.

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2017

Dr. Sreedevi K Menon, “Microstrip Patch Antenna Assisted Compact Dual Band Planar Crossover”, Electronics, vol. 6, p. 74, 2017.[Abstract]


In Microwave Monolithic Integrated Circuits, crossovers maintain signal purity when transmission lines overlap with each other. A simple crossover for dual band applications, particularly suitable for the development of smart antennas, is presented in this paper. Derived from conventional patch antenna, the proposed crossovers are easy to design and fabricate, thus reducing the overall complexity. Design is verified for a dual band crossover at 2.4/5.23 GHz on FR4 (Fiberglass Reinforced) epoxy and tested using Keysight E5080 A Vector Network Analyser. The results obtained by simulation and measurement are in agreement. The proposed crossovers find application in a Butler matrix for phased array and smart antenna systems.

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2017

A. K. Singavi, Dr. Sreedevi K Menon, Kilari, D., Alqwasmi, A., Ritch, P. S., Thomas, J. P., Martin, A. L., Oxencis, C., Ali, S., and George, B., “1140PDPredictive biomarkers for hyper-progression (HP) in response to immune checkpoint inhibitors (ICI) – analysis of somatic alterations (SAs)”, Annals of Oncology, vol. 28, 2017.[Abstract]


Background: Pseudo-progression associated with ICI has been well described. HP - characterized by paradoxically accelerated tumor growth rate (TGR) - while on ICI is increasingly being recognized. Preliminary data have reported murine double minute (MDM2/MDM4) amplification as a possible predictive biomarker for HP based on pre-treatment next generation sequencing (NGS) of tumor tissue. We sought to identify patients that hyper-progressed at our institution, characterize the SAs in those patients (pts) and conversely, estimate the incidence of HP in pts with such SAs.Methods: HP was defined as: 1. progression at first restaging on ICI 2. Increase in tumor size \> 50\%, 3. \>2-fold increase in TGR. Data were obtained by interrogating our institutional electronic medical record and molecular database (MDB). Next Generation Sequencing (NGS -Foundation Medicine, Cambridge MA) was performed on pre-treatment tumor tissue; DNA was extracted, NGS was performed on hybrid-capture, adaptor ligation based libraries to a mean coverage depth of \> 600 for up to 315 genes plus 47 introns from 19 genes frequently rearranged in cancer.

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2016

V. M. Jayakrishnan and Dr. Sreedevi K Menon, “Ring Based Planar Crossover for Beamforming Networks”, Procedia Technology, vol. 25, pp. 629 - 634, 2016.[Abstract]


A crossover maintains signal integrity when transmission lines overlap. In this paper, a microstrip patch is used to design the overlapping region thus providing desired isolation and transmission between desired ports. Square and Circular patch configurations for crossovers are analysed using ANSYS HFSS. The basic microstrip patch is further modified by introducing fractals enhancing the electrical length and improving the crossover characteristics.

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2016

J. Rajendran and Dr. Sreedevi K Menon, “On the miniaturization of log periodic Koch dipole antenna using split ring resonators”, Progress in Electromagnetics Research Letters, vol. 63, pp. 107-113, 2016.[Abstract]


In this paper, a printed split ring resonator (SRR) loaded log-periodic Koch dipole antenna (SLPKDA) is proposed. Koch-shaped dipoles when being loaded with split ring resonator (SRR) yielded a compact antenna, still preserving the radiation properties of log-periodic dipole antenna (LPDA). Measurement results show that the proposed antenna has a wide bandwidth, good impedance match and gain of 4 dBi over the band of frequencies from 0.9 GHz to 2.5 GHz. Both vertical and horizontal dimension reductions are achieved by loading Koch dipoles with SRR.

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2016

R. P. Lal, Warrier, P. M., Dr. Sreedevi K Menon, Bhateja, V., Udgata, S. K., and Mandal, J. K., “Substrate integrated waveguide based 4-port crossover for beam-forming applications”, Advances in Intelligent Systems and Computing, vol. 434, pp. 129-135, 2016.[Abstract]


In this paper an effective crossover is designed using Substrate Integrated Waveguide (SIW) technology. Reflection, transmission and isolation of the crossover is studied along with the electric field to substantiate the effectiveness of the crossover. At the operating frequency, an isolation better than 35 dB is achieved between the decoupled ports with a transmission of *1 dB through the coupled ports. © Springer India 2016.

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2016

M. Mehta, Naveen, K. A., Rajan, V., Pillai, R. R., Dr. Sreedevi K Menon, M.A., B., S., D., and S.S., D., “Planar crossover using microstrip patch antenna for beamforming networks”, Advances in Intelligent Systems and Computing, vol. 394, pp. 411-415, 2016.[Abstract]


In this paper, a simple planar design for a symmetric four-port crossover is presented. The proposed crossover is derived from a microstrip patch antenna with a set of two orthogonal feeds. Electrical length of the microstrip patch antenna is increased by incorporating slots achieving a frequency shift to the lower side. The slot in the patch antenna is derived from fractal geometry, which allows three stages of iteration. Isolation better than –15 dB and transmission 0 dB is observed in the frequency range of interest. The proposed crossover is a potential candidate for Butler matrix in beamforming applications. © Springer India 2016.

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2015

P. Dhumalex, Dr. Sreedevi K Menon, Lutter, D., and Püschel, A., “Loss of Sad kinases results in different phenotypes during hippocampal and cortical development: P21-002-SH”, The Febs Journal, vol. 282, 2015.

2014

G. D. Gupta, Dey, G., Swetha, M. G., Ramalingam, B., Shameer, K., Thottacherry, J. Jose, Kalappurakkal, J. Mathew, Howes, M. T., Chandran, R., Das, A., Dr. Sreedevi K Menon, Parton, R. G., Sowdhamini, R., Thattai, M., and Mayor, S., “Population distribution analyses reveal a hierarchy of molecular players underlying parallel endocytic pathways.”, PLoS One, vol. 9, no. 6, p. e100554, 2014.[Abstract]


Single-cell-resolved measurements reveal heterogeneous distributions of clathrin-dependent (CD) and -independent (CLIC/GEEC: CG) endocytic activity in Drosophila cell populations. dsRNA-mediated knockdown of core versus peripheral endocytic machinery induces strong changes in the mean, or subtle changes in the shapes of these distributions, respectively. By quantifying these subtle shape changes for 27 single-cell features which report on endocytic activity and cell morphology, we organize 1072 Drosophila genes into a tree-like hierarchy. We find that tree nodes contain gene sets enriched in functional classes and protein complexes, providing a portrait of core and peripheral control of CD and CG endocytosis. For 470 genes we obtain additional features from separate assays and classify them into early- or late-acting genes of the endocytic pathways. Detailed analyses of specific genes at intermediate levels of the tree suggest that Vacuolar ATPase and lysosomal genes involved in vacuolar biogenesis play an evolutionarily conserved role in CG endocytosis.

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2010

A. B. Kakade, Ghosh, B., and Dr. Sreedevi K Menon, “Efficient technique for the analysis of coaxial probe-coupled hemispherical dielectric resonator antenna”, Microwave and Optical Technology Letters, vol. 52, pp. 1588-1591, 2010.[Abstract]


Abstract In this article, a fast and efficient technique for the analysis of a coaxial probe fed dielectric resonator antenna is presented, which is 100 times faster than the previously reported analysis.The method is implemented by manipulating the Green's function such that the source and field terms are decoupled. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1588–1591, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25272

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2006

P. V. Bijumon, Dr. Sreedevi K Menon, Suma, M. N., Lethakumary, B., Sebastian, M. T., and Mohanan, P., “Broadband elliptical dielectric resonator antenna”, Microwave and Optical Technology Letters, vol. 48, pp. 65-67, 2006.[Abstract]


Abstract A broadband low-loss elliptical dielectric resonator antenna (DRA) excited by using the microstrip-line technique is proposed. The effect of geometrical modifications of the microstrip feed line on the gain, bandwidth, and radiation performances of the antenna has also been investigated. The proposed antenna offers enhanced radiation characteristics compared to conventional microstrip-patch antennas. © Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 65–67, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21262

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2005

B. Lethakumary, Dr. Sreedevi K Menon, Francis, P., Aanandan, C. K., Vasudevan, K., and Mohanan, P., “Wideband microstrip antenna using hook-shaped feed”, Microwave and Optical Technology Letters, vol. 44, pp. 169-171, 2005.[Abstract]


In this paper, we introduce a novel feeding technique for bandwidth enhancement of a rectangular microstrip antenna. This antenna offers an impedance bandwidth of 22% without degrading the efficiency. The effect of the feed parameters upon patch characteristics such as resonant frequency, impedance bandwidth, and radiation pattern are studied in detail. The experimental results are verified using the FDTD results. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 169–171, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20578

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2005

P. V. Bijumon, Dr. Sreedevi K Menon, Suma, M. N., Sebastian, M. T., and Mohanan, P., “Broadband cylindrical dielectric resonator antenna excited by modified microstrip line”, Electronics Letters, vol. 41, pp. 385–387, 2005.[Abstract]


The impedance bandwidth of a high permittivity cylindrical dielectric resonator antenna excited by a microstrip line was significantly improved by modifying the feed geometry. The 10 dB return loss bandwidth is enhanced from 12 to 26% without much affecting the gain and other radiation properties of the antenna. Good agreement has been observed between the predicted and measured results.

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2005

M. N. Suma, Dr. Sreedevi K Menon, Bijumon, P. V., Sebastian, M. T., and Mohanan, P., “Rectangular dielectric resonator antenna on a conductor-backed co-planar waveguide”, Microwave and optical technology letters, vol. 45, pp. 154–156, 2005.[Abstract]


In this paper, we present an effective excitation of a rectangular dielectric resonator antenna (DRA) with a conductor-backed co-planar waveguide (CB-CPW). The radiation and resonance characteristics are found to vary, depending on the orientation of the DR on the coplanar feed line. The effect of finite and infinite ground planes of CB-CPW on the radiation characteristics of the rectangular DRA is studied. The orientation and position of the DR are optimized for maximum gain and bandwidth. The optimized antenna geometry offers ∼10.46 dBi gain and 7.5% bandwidth with low cross-polar radiation characteristics. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 154–156, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20754

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2005

Dr. Sreedevi K Menon, Menon, S., Lethakumary,, Bijumon,, Sebastian, M., and Pezholil, M., “L-strip-fed Wideband Rectangular Dielectric Resonator Antenna”, Microwave and Optical Technology Letters, vol. 45, 2005.[Abstract]


In this paper, the advantages of using L-shaped microstrip feed to excite a rectangular dielectric resonator antenna (DRA) by electromagnetic coupling are presented. This feeding technique enhances the bandwidth and gain of the antenna without affecting its size. The experimental results are validated using Fidelity software based on the finite-difference time-domain (FDTD) method. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 227–228, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20778

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2005

Dr. Sreedevi K Menon, Vasudevan, K., Aanandan, C. K., and Mohanan, P., “Compact asymmetric coplanar waveguide filter”, Electronics Letters, vol. 41, pp. 649–650, 2005.[Abstract]


The design and implementation of a novel asymmetric coplanar waveguide (ACPW) band rejection filter using defected ground structure (DGS) is presented. The proposed ACPW DGS technology provides bandgap characteristics with only one cell in the lateral ground plane. The equivalent circuit model of the proposed DGS unit section is described. Measurements of ACPW DGS showed good agreement with simulation and the proposed model.

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2005

Dr. Sreedevi K Menon, Vasudevan, K., Aanandan, C. K., and Mohanan, P., “Design and analysis of microstrip lines with EBG-backed ground planes of different geometrical shapes”, Microwave and Optical Technology Letters, vol. 46, pp. 544-546, 2005.[Abstract]


Abstract Propagation of electromagnetic waves through a microstrip line with 2D electromagnetic band gap (EBG) structures of different geometrical shapes in the ground plane is investigated in this paper. Using transmission-line theory, the design equations for EBG structures are calculated. The measured, numerical, and simulated results are in good agreement. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 544–5446 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21044

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2005

P. V. Bijumon, Dr. Sreedevi K Menon, Suma, M. N., Lethakumari, B., Sebastian, M. T., Mohanan, P., and , “T-strip-fed high-permittivity rectangular dielectric resonator antenna for broadband applications”, Microwave and optical technology letters, vol. 47, pp. 226–228, 2005.[Abstract]


A rectangular low-density, high-permittivity dielectric resonator antenna (DRA) excited by T-shaped microstrip feed offering a 2:1 VSWR bandwidth of ∼22% at 2.975 GHz is reported. The design methodology and experimental results of the antenna are discussed. The excellent gain and radiation performance of the proposed antenna projects it as a potential candidate for telecommunication applications. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 226–228, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21131

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2004

S. Mridula, Dr. Sreedevi K Menon, Mohanan, P., Bijumon, P. V., and Sebastian, M. T., “Characteristics of a microstrip-excited high-permittivity rectangular dielectric resonator antenna”, Microwave and optical technology letters, vol. 40, pp. 316–318, 2004.[Abstract]


The radiation characteristics of a microstrip-line-excited rectangular dielectric resonator antenna (DRA) are studied experimentally. The radiation characteristics and excitation of different modes are highly influenced by the orientation of the DR, feed line parameters, and finite size of the ground plane. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 316–318, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11366

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2004

B. Lethakumary, Dr. Sreedevi K Menon, Aanandan, C. K., Vasudevan, K., and Mohanan, P., “L-strip excited wideband rectangular microstrip antenna”, Microwave and Optical Technology Letters, vol. 42, pp. 173-175, 2004.[Abstract]


This paper presents the outcome of the experimental studies performed on L-strip-fed compact rectangular microstrip antenna. The effect of the feed parameters upon the characteristics of the antenna is studied in detail. The antenna offers an impedance bandwidth of nearly 20% and is suitable for broadband applications. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 173–175, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20243

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2004

Dr. Sreedevi K Menon, Lethakumary, B., Mohanan, P., Bijumon, P. V., and Sebastian, M. T., “Wideband cylindrical dielectric resonator antenna excited using an L-strip feed”, Microwave and Optical Technology Letters, vol. 42, pp. 293-294, 2004.[Abstract]


A broadband cylindrical dielectric resonator antenna (DRA) energized with an L-strip feed is presented. The novel exciting technique achieves a 2:1 VSWR bandwidth of 18%. The variation of bandwidth for different feed parameters is also studied. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 293–294, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20281

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2004

Lethakumary, Sreedevi,, Dr. Sreedevi K Menon, K, A. C., Kesavath, V., and Pezholil, M., “FDTD analysis of a symmetric T-STRIP fed wideband rectangular microstrip antenna”, Microwave and Optical Technology Letters, vol. 43, 2004.[Abstract]


A theoretical analysis of a symmetric T-shaped rnicrostripfed rectangular microstrip antenna using the finite-difference titnedoniain (FDTD) method is presented in this paper. The resonant frequency, return loss, impedance bandwidth, and radiation patterns are predicted and are in good agreement with the measured results

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2003

B. Lethakumary, Dr. Sreedevi K Menon, Aanandan, C. K., and Mohanan, P., “A wideband rectangular microstrip antenna using an asymmetric T-shaped feed”, Microwave and Optical Technology Letters, vol. 37, pp. 31-32, 2003.[Abstract]


An electromagnetically coupled T-shaped microstrip feed used to enhance the impedance bandwidth of a rectangular microstrip antenna is reported. The proposed antenna offers a 2:1 VSWR bandwidth of ∼36% with an increase in gain of 0.8 dB. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 31–32, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10815

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2002

S. M.N, Dr. Sreedevi K Menon, .V.Bijumon, P., .T.Sebastian, M., and .Mohanan, P., “A Broadband Cylindrical Dielectric Resonator Antenna Excited By Conductor Backed Coplanar Waveguide”, 2002.[Abstract]


The radiation and resonance characteristics of cylindrical dielectric resonator antenna excited by a conductor backed coplanar waveguide (CB-CPW) is presented in this paper. The proposed antenna configuration offers a 2:1 VSWR
bandwidth of 18 % with excellent gain and cross-polar level.

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2002

S. Mridula, Dr. Sreedevi K Menon, Lethakumary, B., Paul, B., Aanandan, C. K., and Mohanan, P., “Planar L-strip fed broadband microstrip antenna”, Microwave and Optical Technology Letters, vol. 34, pp. 115-117, 2002.[Abstract]


A broadband rectangular microstrip antenna utilizing an electromagnetically coupled L-strip feed is presented. Experimental study shows a 2:1 VSWR bandwidth of ≈ 10% and excellent cross-polarization performance with a radiation coverage almost as same as that of the rectangular microstrip antenna fed by conventional methods. The variation of bandwidth for different feed parameters is also studied. The proposed antenna is suitable for broadband communications. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 115–117, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10390.

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2002

Dr. Sreedevi K Menon, Lethakumary, B., Vasudevan, K., and Mohanan, P., “Wide band rectangular microstrip antenna using symmetric T-shaped feed”, Microwave and Optical Technology Letters, vol. 35, pp. 235-236, 2002.[Abstract]


Bandwidth enhancement of a rectangular microstrip antenna using a T-shaped microstrip feed is explored in this paper. A 2:1 VSWR impedance bandwidth of 23% is achieved by employing this technique. The far-field patterns are stable across the pass band. The proposed antenna can be used conveniently in broadband communications. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 235–236, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10566

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2002

P. V. Bijumon, Dr. Sreedevi K Menon, Sebastian, M. T., and Mohanan, P., “Enhanced bandwidth microstrip patch antennas loaded with high permittivity dielectric resonators”, Microwave and Optical Technology letters, vol. 35, pp. 327–330, 2002.[Abstract]


A novel technique for the bandwidth enhancement of conventional rectangular microstrip antenna is proposed in this paper. When a high permittivity dielectric resonator of suitable resonant frequency was loaded over the patch, the % bandwidth of the antenna was increased by more than five times without much affecting its gain and radiation performance. A much more improved bandwidth was obtained when the dielectric resonator was placed on the feedline. Experimental study shows a 2:1 VSWR bandwidth of more than 10% and excellent cross polarization performance with increased pass band and radiation coverage almost the same as that of rectangular microstrip antenna. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 327–330, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10597

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Publication Type: Conference Proceedings

Year of Publication Title

2018

Meenu L, S. Aiswarya, and Dr. Sreedevi K Menon, “Experimental Investigations on Monopole Loop Antenna with Dual Band Characteristics”, Wireless Communications, Signal Processing and Networking (WiSPNET), 2017 International Conference on. IEEE, Chennai, India, 2018.[Abstract]


A coplanar waveguide (CPW) fed rectangular loop antenna with dual frequency characteristics applicable Wi-Fi bands is presented. The studies to calculate the dependency of frequencies on the antenna structure is carried out using ANSYS HFSS. From this, the antenna is optimized to have an enhanced gain of ~ 8 dBi at 2.45 GHz and 3.83 dBi at 5.32 GHz. The radiation characteristics of the antenna are studied and the radiation pattern confirms the monopole characteristics at both the frequencies. The optimized antenna performance is confirmed by measurements using Vector Network Analyser. Since energized using coplanar waveguide the proposed antenna finds applications in Microwave Monolithic Integrated Circuits (MMIC) also.

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2017

Betsy George, Bhuvana;, N. S., and Dr. Sreedevi K Menon, “Design of Edge Coupled Open Loop Metamaterial Filters”, PIERS 2017. St. Petersburg, 2017.

2016

J. Rajendran and Dr. Sreedevi K Menon, “A Low-Cost Compact Wideband Printed Planar Log Periodic Sierpinski Antenna”, Progress in Electromagnetics Research Symposium (PIERS). 2016.[Abstract]


In this paper, sierpinski-shaped dipoles are introduced in a printed log-periodic dipole antenna design. A Log Periodic Sierpinski Antenna (LPSA) is developed and the characteristics studied. Antenna size is considerably reduced, still maintaining the overall performance characteristics. The results are compared with that of a standard printed LPDA. A set of shapes of LPSA are studied and the observations and characteristics analysed. A size reduction of approximately 50% is achieved by the LPSA when compared with ordinary printed LPDA. The antenna size is reduced considerably with little degradation in the radiation characteristics. This paper proposes two antenna prototypes viz. LPSA and LPS2A operating at L-band and higher frequency range. They are compact compared to the LPDA counterparts. The two antenna prototypes is to be fabricated on cheap FR-4 substrate. Return loss, radiation pattern and gain of the two antenna prototypes are studied. Simulations are carried out in Ansoft HFSS. The antennas are found to have stable radiation pattern. The results are compared with the LPDA counterpart and comparison of performance presented. The simulated results show that the proposed antenna prototypes have better and stable characteristics compared to LPDAs and could be used in L band and S band.

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2015

Anand R, Jose, J. Alphonsa, M, K. Anju, and Dr. Sreedevi K Menon, “Analysis of Dual Beam Pentagonal Patch Antenna”, International Conference on Computer and Communication Technologies. Hyderabad, India, 2015.

2015

R. Anand, Jose Jesmi Alphonsa, Anju M Kaimal, and Dr. Sreedevi K Menon, “Analysis of High Gain Dual Beam Pentagonal Patch Antenna Array”, 36th Progress In Electromagnetics Research Symposium. 2015.

2011

Dr. Sreedevi K Menon, Reddy, V., Nath, G., ,, and Kumar, V., “Electromagnetic Transducer”, Progress In Electromagnetics Research Symposium, PIERS 2011. Kuala Lumpur, 2011.

2004

Dr. Sreedevi K Menon, Lethakumary, B., Aanandan, C. K., Vasudevan, K., Nair, K. G., and Mohanan, P., “Bandwidth Enhancement of Microstrip Antenna Using Photonic Band Gap Structure”, National Symposium on Antennas and Propagation (APSYM 2004). Kochin, 2004.

2004

Dr. Sreedevi K Menon, Paul, B., Mridula, S., Aanandan, C. K., Mohanan, P., Bijumon, P. V., and Sebastian, M. T., “Time Domain Analysis of a Microstrip Line Excited Compact Rectangular Dielectric Resonator Antenna”, 20th Annual Review of Progress in Applied Computational Electromagnetics (ACES-04). Syracuse, NewYork, 2004.

2004

S. Mridula, Dr. Sreedevi K Menon, Paul, B., Aanandan, C. K., .Vasudevan, K., Mohanan, P., Bijumon, P. V., and Sebastian, M. T., “Experimental Investigations on a Microstrip Fed Compact Rectangular Dielectric Resonator Antenna”, International Conference on Computers and Devices for communication (CODEC – 04). Institute of Radio Physics and Electronics, University of Calcutta, 2004.

2004

Dr. Sreedevi K Menon, Aanandan, C. K., and Mohanan, P., “Rectangular Microstrip Antenna with PBG Structured Ground Plane”, 2004 IEEE Antennas and Propagation Society International Symposium. 2004.

2003

Dr. Sreedevi K Menon, Lethakumary, B., Aanandan, C. K., Vasudevan, K., and Mohanan, P., “ Wide Band Rectangular Microstrip Antenna”, First International Conference on Microwaves, Antennas, Propagation and Remote Sensing (ICMARS 2003 ). 2003.

2003

Dr. Sreedevi K Menon, Lethakumari, B., Aanandan, C. K., .Vasudevan, K., Mohanan, P., Bijumon, P. V., and Sebastian, M. T., “Microstrip Fed Compact Rectangular Dielectric Resonator Antenna”, First International Conference on Microwaves, Antennas, Propagation and Remote Sensing (ICMARS 2003 ). 2003.

2003

Dr. Sreedevi K Menon, Lethakumary, B., Aanandan, C. K., and Mohanan, P., “Rectangular Microstrip Antenna with PBG Structured Ground Plane”, First International Conference on Microwaves, Antennas, Propagation and Remote Sensing (ICMARS 2003 ). 2003.

2002

Dr. Sreedevi K Menon, Bijumon, P. V., Sebastian, M. T., and Mohanan, P., “Enhanced Bandwidth Rectangular Dielectric Resonator Antenna Using Microstrip Feed”, National Symposium on Antennas and Propagation (APSYM 2002). 2002.

2002

Dr. Sreedevi K Menon, Lethakumary, B., Aanandan, C. K., Vasudevan, K., and Mohanan, P., “FDTD Analysis of L-strip Fed Microstrip Antenna”, National Symposium on Antennas and Propagation (APSYM 2002). Kochin, 2002.

2002

Dr. Sreedevi K Menon, Lethakumary, B., Mohanan, P., Bijumon, P. V., and Sebastian, M. T., “Dielectric Resonator Loaded Microstrip Antenna”, Interactive Integrated Technological Advancement – Recent Trends (IITART). Trivandrum, 2002.

2002

Dr. Sreedevi K Menon, Lethakumary, B., Aanandan, C. K., Vasudevan, K., and .Mohanan, P., “Wide band Rectangular Microstrip Antenna using L-shaped Feed”, 2002 IEEE Antennas and Propagation Society International Symposium. Texas, 2002.

Publication Type: Thesis

Year of Publication Title

2012

Dr. Sreedevi K Menon, “Regulation of Neuronal Polarity by Sad Kinases”, 2012.

Publication Type: Patent

2003 International Patent Microwave dielectric ceramic composition, method of manufacture thereof and devices comprising the same , M. T. Sebastian, P. V. Bijumon, P. Mohanan and Sreedevi. K. Menon . PCT/IN02/00051. (US Patent).
2001 National Patent Development of novel cylindrical resonator antenna and other devices based on new microwave dielectric ceramic composition in the Ca5A2TiO12 system [A=Nb, Ta], M.T. Sebastian, P.V. Bijumon, P. Mohanan and Sreedevi. K. Menon. NF/482/2001.