Qualification: 
M.Tech, B-Tech
aiswaryas@am.amrita.edu

Aiswarya S. currently serves as a Research Assistant at the Amrita Center for Wireless Networks and Applications, Amrita Vishwa Vidyapeetham

Education

  • 2014 - 2016: M.Tech. (Wireless Networks and Applications)
    Amrita Vishwa Vidyapeetham, Amritapuri
  • 2010 - 2014: B.Tech. (Electronics and Communication Engineering)
    Valia Koonambaikulathamma College of Engineering and Technology, Thiruvananthapuram, Kerala
     

Publications

Publication Type: Journal Article

Year of Publication Title

2019

P. Rajitha, Shammika, P., S. Aiswarya, Gopikrishnan, A., Dr. Jayakumar Rangasamy, and Dr. Sabitha M., “Chaulmoogra oil based Methotrexate Loaded Topical Nanoemulsion for the Treatment of Psoriasis”, Journal of Drug Delivery Science and Technology, vol. 49, pp. 463 - 476, 2019.[Abstract]


Chaulmoogra oil based methotrexate loaded nanoemulsion was prepared via emulsification technique using tween 80 and ethanol as surfactants. The formulation was characterized by FTIR and TEM. The prepared nanoemulsion has an average particle size of 34 nm with negative surface charge and has pH compatible to skin. Rheological studies revealed the shear thinning non-Newtonian visco-elastic behavior of the formulation as explained by the Herschel Bulkley model. The formulation was cytocompatible towards mouse dermal fibroblast L929 cells when tested by MTT assay and was stable in refrigerator for the tested period of 3 months. The in-vitro release mechanism of methotrexate from formulation followed zero order release kinetics with non Fickian diffusion mechanism. The ex-vivo skin permeation studies done by Franz diffusion cell apparatus using porcine skin revealed the improved skin permeation and retention of drug in deep skin layers when compared with control drug solution. The in vivo anti-psoriatic studies done on imiquimod psoriatic model revealed superior anti-psoriatic efficacy, with effective skin retention and lesser serum and tissue accumulation when compared with orally administered methotrexate tablet.

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Publication Type: Conference Paper

Year of Publication Title

2018

S. N. Rao, Raj, D., Parthasarathy, V., S. Aiswarya, Dr. Maneesha V. Ramesh, and Rangan, V., “A Novel Solution for High Speed Internet Over the Oceans”, in IEEE INFOCOM 2018 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), 2018.[Abstract]


The cellular network range over the oceans is limited to about 15 km from the shore in most places. The service providers do not have any incentive to extend the coverage further. However, marine fishermen who routinely spend 5 to 7 days at the ocean on a single fishing trip are severely impacted by this. They go as far away as 120 km from the shore on some occasions and are completely cut off from the land during their fishing trips. Also, they are generally poor and need an economical solution to stay connected. We have developed and successfully prototyped an affordable solution based on a multi-level auto-reconfigurable backhaul infrastructure network. It uses long range (LR) Wi-Fi and extends the connectivity to 60 km and beyond over the oceans using heterogeneous networks and relay nodes. Multiple field trials involving up to four boats over the Arabian Sea have yielded consistent and repeatable results even under rough sea states. Additional experiments conducted over the backwaters by scaling up the network further have also yielded positive results. This work provides a detailed description of the architected solution and the results obtained. More »»

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

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

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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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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