Qualification: 
Ph.D, M.Tech
s_natarajamani[at]cb[dot]amrita[dot]edu
Phone: 
+91 422 2685000 Ext. 5726

Natarajamani S. received the B. E. and M. E. degrees from Anna University, India, in 2005 and 2007, respectively, Ph. D. from National Institute of Technology-Rourkela, India, in 2014. He is presently working as an Assistant Professor in the Department of Electronics and Communication Engineering, School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India. His current research interest includes Planar Antennas and Microstrip Bandpass Filter for Wireless Application.

Education

  • 2014: Ph. D.- Full Time Institute Fellowship - Microwave Engineering
    National Institute of Technology, Rourkela
  • 2007: M. E. in Communication Systems
    Anna University, Chennai

Professional Experience

Year Affiliation
July 2015 - Present Assistant Professor, Department of Electronics and Communication Engineering, School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore
Domain : Teaching, Research and Projects

Academic Responsibilities

SNo Position Class / Batch Responsibility
1. Class Adviser 2016 - 20 - Approve all designated educational transactions
- Maintain an up-to-date Advising Portfolio
2. Time-Table Coordinator 2017-19 UG & PG Timetable Preparation/Semester

Undergraduate Courses Handled

  1. Radio frequency engineering
  2. Antenna system and design
  3. Transmission lines and waveguide.
  4. Microstrip devices and circuits

Post-Graduate / PhD Courses Handled

  • Modeling and Simulation of communication systems

Specialized Courses Developed

Course Name Specialization Programme Outcome
Radio frequency engineering Microwave Engineering PSO1 - Understand important and unique engineering issues at radio frequencies POS2- To analyse the parameters of radio frequency systems design.
Antenna system and design Microwave Engineering POS1- Understand the basic operation of how are the electromagnetic fields radiated POS2- Design and analyse some selected type of antenna

Participation in Faculty Development / STTP / Workshops /Conferences

SNo Title Organization Period Outcome
1. Workshop on Antenna Design and Analysis using ESI’S CEM Solution Tool Anna University Coimbatore December 3 - 4, 2015 Elective Course and Research
2. National Seminar on Electromagnetics: Fundamentals, Relevance and Application Bharathiar Univesity-Coimbatore March 8 - 9, 2018 Elective Course and Research

Academic Research – PhD Guidance

SNo Name of the Scholar Specialization / Title Duration / Registration Status / Year
1. G Prabha Linear array for Direction of Arrival(DOA) and Adaptive Beamforming July 2014 Research work ongoing.
2. Jagadeesh Chandra Prasad R Reconfigurable Antenna July 2017 Course work completed
3. Rekha G Nair Microstrip Power Divider July 2018 Course on going
4. T Poornima Microstrip Bandpass Filter July 2018 Course on going

Academic Research – PG Projects

SNo Name of the Scholar Programme Specialization Duration Status
1. Adarsh J M.Tech Communication and Signal Processing 2015-17 Completed
2. Rohit Kumar K M.Tech Communication and Signal Processing 2015-17 Completed
3. Sushmeetha R R M.Tech Communication and Signal Processing 2016-18 Completed
4. Salini Joy M.Tech Communication and Signal Processing 2016-18 Completed
5. Divya Bharathi S M.Tech Communication and Signal Processing 2016-18 Completed
6 Bhimavarapu Sri Harshavardhan M.Tech Communication and Signal Processing 2017-19 Ongoing

Sanctioned Projects

SNo Title Agency Amount Duration Status
1. Automated structural evolution and performance optimization of RF bandpass filters- An Evolutionary algorithmic design approach ISRO Rs.1270000/- Two years Ongoing

Products Developed

SNo Product Name / Domain Description Resource Industry if any
1. Microstrip Patch antenna Circular polarization patch antenna for WLAN application UG/PG Projects Nil
2. Dual Band Microstrip Bandpass Filter Metamaterial based microstrip bandpass filter UG/PG Projects Nil

Publications

Publication Type: Conference Proceedings

Year of Publication Title

2017

J. Prakash, Vijay, R., and Dr. Natarajamani S., “MIMO Antenna for Mobile Terminals with Enhanced Isolation in LTE Band”, 2017 International Conference on Advances in Computing, Communications and Informatics (ICACCI). pp. 2231-2234, 2017.[Abstract]


A MIMO antenna system comprising of two antenna elements is proposed for utilization in Long Term Evolution (LTE) frequencies for mobile terminals. The antenna element is a coupled fed printed monopole capable of functioning at LTE 2300 on a printed circuit board. The antennas are located symmetrically on the top side of the circuit board. The substrate used here is FR4 which possesses a relative permittivity of 4.4 as well as a loss tangent of 0.02. In order to reduce the mutual coupling between the antennas, a decoupling structure consisting of a ground branch is introduced which extends into the non-grounded region below the substrate. The overall dimensions of the system are 65 × 90 × 0.8 mm3, with each antenna element having an area of 24 × 14 mm2. The isolation achieved over the frequency band for the antennas leads to an envelope correlation coefficient value which is less than 0.01.

More »»

2010

Dr. Natarajamani S., .S.K, B., and .S.K, P., “Compact Slot Antenna for UWB Application and Band-Notch Design”, IEEE 5th International Conference on Computational Intelligence and computer networks. pp. 11-15, 2010.[Abstract]


—A simple and compact coplanar waveguide (CPW)-fed ultra wide band antenna is presented. The UWB antenna consists of a rectangular patch, which is etched onto an FR4 printed circuit board(PCB) with an overall size of 30mmX35mmX0.76mm. The simulation show that the UWB antenna achieves good impedance matching, consistent gain, and consistent group delay over an operating bandwidth. The correlation between the mode-based field distribution is discussed. Extended from the UWB antenna, four notch (5- 6GHz) designs are also presented as a desirable feature for UWB application.

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2010

M. .P, Dr. Natarajamani S., and .S.K, B., “Inverted U-Shaped Dielectric Resonator Antenna for WLAN”, IEEE International Conference on Communication Control and Computing Technology, india. 2010.[Abstract]


A Dielectric resonator antenna design is presented for Wireless Local Area Network (WLAN) applications. By using a dielectric resonator with an inverted U-shape cross section and optimized rectangular patch adhered in between the dielectric resonator as a feeding mechanism, an impedance bandwidth of about 15.7% and covering a frequency range of 5.1 to 5.97 GHz is achieved and resonating at 5.5GHz. The proposed antenna is suitable for wireless local area networks (WLAN) applications in 5-6 GHz frequency range. This U Shaped DRA exceeds the bandwidth requirements for the IEEE 802.11a wireless local area network (WLAN) applications (5.15-5.35 GHz and 5.725-5.825 GHz) within a 2:1 VSWR. Parametric studies of the antennas with CST microwave based design data and simulated results are presented here.

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2010

Dr. Natarajamani S., .S.K, B., and .S.K, P., “Compact CPW-fed Dual-Band Antenna for WLAN/UWB Application”, IEEE International Conference on Communication Control and Computing Technology. pp. 5-8, 2010.[Abstract]


This paper proposes a compact planar single band and dual-band antenna for Wideband local area (WLAN)I ultra wideband (UWB) applications. The antenna consists of eUiptical metal patch and a son coplanar waveguide (CPW) transmission line. By etching C-shaped slot in the patch for dual-band antenna (2.4SGHzl3.1-10.6GHz). The proposed antenna is successfully designed and simulated. It shows that broadband matched impedance, stable radiation patterns, constant gain and consistent group delay over an operating bandwidth

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2010

Dr. Natarajamani S., .S.K, B., and .S.K, P., “A Compact Wide band Patch Antenna for WLAN Application”, IEEE second International Conference on Computing, Communication and Networking Technologies. pp. 1-4, 2010.

2009

Dr. Natarajamani S., .S.K, B., and .R.K, M., “Design of Multi slotted and Multi frequency patch Antenna”, IEEE Applied Electromagnetic Conference, India. pp. 1-3, 2009.[Abstract]


Design of Low profile single feed dual band microstip antenna operated at Wi-Fi/Wi-Max system is presented. It is demonstrated that by cutting slots into radiating edges of microstip patch antenna, a dual frequency response is achieved. The antenna was studied by means of numerical simulation. The return losses at 2.45 GHz, 3.4 GHz are -21.5dB, -13.2 dB respectively. Its bandwidth of 35MHz extends from 2.435GHz to 2.47GHz at the lower band. Its radiation patterns are also studied.

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Publication Type: Journal Article

Year of Publication Title

2014

Dr. Natarajamani S., “Some Studies on Designs of Planar Antennas for UWB Applications”, 2014.[Abstract]


In Ultra-Wideband (UWB) wireless system, considerable research efforts have been put into the design of UWB antennas and communication systems. These UWB antennas are essential for providing wireless wideband communications based on the use of very narrow pulses on the order of nanoseconds, covering a very wide bandwidth in the frequency domain and over very short distance at very low power densities. Also it is well known that, in traditional narrow-band communications, multiple antenna systems offer attractive aspects in wireless communication by means of Multiple-Input Multiple-Output (MIMO) techniques. These techniques either give out high channel capacities through spatial multiplexing, or offer an increase of link robustness. The present work deals with four new compact broadband antennas, suitable for portable applications are designed and characterized, namely- octagon shaped monopole, semicircular disk monopole, semi-octagon shaped diversity, semi-circular diversity. The performances of these designs have been studied using standard simulation tools used in industry or academy and experimentally verified. One of the major contributions of the thesis lies in the analysis of the frequency and time-domain response of the designed UWB antennas to confirm their suitability for portable pulsed-UWB system. A technique to avoid narrow band interference by etching narrow slot resonators on the antenna is also proposed and their effects on a nano-second pulse have been investigated. More »»

2013

Dr. Natarajamani S., Behera, S. Kumar, and Patra, S. Kumar, “Planar Ultrawideband Fractal Antenna with 3.4/5.5 GHz Dual Band-Notched Characteristics”, International Journal of Signal and Imaging Systems Engineering, vol. 6, 2013.[Abstract]


A simple and compact coplanar waveguide (CPW)-fed ultra wideband (UWB) antenna is presented. The proposed antenna consists of a circular patch with triangular slot, which is etched onto FR4 Printed Circuit Board (PCB) with overall size of 39.2 × 43.5 × 1.6 mm3. The simulated and measurement results shown that the antenna achieves goo impedance matching, consistent gain and stable radiation patterns. Extended UWB antenna with notch band (3.3–3.6 GHz & 5–6 GHz) design are also presented as a desirable feature for UWB application.

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2013

Dr. Natarajamani S., Behera, S. K., and Patra, S. K., “Planar ultra-wideband fractal antenna with 3.4 and 5.5 GHz dual band-notched characteristics”, International Journal of Signal and Imaging Systems Engineering, vol. 6, no. 1, pp. 46-51, 2013.[Abstract]


A simple and compact coplanar waveguide (CPW)-fed ultra wideband (UWB) antenna is presented. The proposed antenna consists of a circular patch with triangular slot, which is etched onto FR4 Printed Circuit Board (PCB) with overall size of 39.2 × 43.5 × 1.6 mm³. The simulated and measurement results shown that the antenna achieves good impedance matching, consistent gain and stable radiation patterns. Extended UWB antenna with notch band (3.3-3.6 GHz & 5-6 GHz) design are also presented as a desirable feature for UWB application. More »»

2013

Dr. Natarajamani S., Behera, S. K., and Patra, S. K., “A Compact planar diversity antennas for ultra wideband application with band notched function”, Microwave and optical technology letters ( Willey Publication), vol. 55, 2013.[Abstract]


A compact two-element diversity planar antenna for ultra-wideband (UWB) application with band-notch function is proposed. By adapting two symmetrical rectangular patches with three bevels cutting in the edge of the radiators, the antenna provides wideband impedance matching characteristics over the desired frequency range. The wideband isolation can be achieved through uniform branch length ratio used in the ground plane. Measured S-parameters show that the antenna is able to cover the entire UWB band from 3.1–10.6 GHz and good isolation of less than -25 dB. Also it has a band-notch function to avoid overlap with the 3.5 GHz WiMAX band. The radiation pattern, realized gain, envelope correlation, and pulse handling capacity are measured. From the results, it is observed that the proposed diversity antenna can be suitable for UWB application. More »»

2013

Dr. Natarajamani S., Behera, S. Kumar, and Patra, S. Kumar, “A triple band-notched planar antenna for UWB applications”, Journal of Electromagnetic Waves and Applications, vol. 27, pp. 1178-1186, 2013.[Abstract]


A compact planar microstrip-fed ultra wideband antenna for triple bands is presented and analyzed. The proposed antenna consists of semi-circular shaped radiating patch with two I-shaped stubs. It provides a wide bandwidth of 3.05–11.7 GHz. A pair of spiral loop resonators merges with radiating patch to create the first notched band in 3.3–3.7 GHz for the WiMAX system. In addition, integrated microstrip resonators are coupled with ground to generate the second- and third-notched bands in 5.2–5.4 GHz for lower WLAN and 5.7–6 GHz for upper WLAN, respectively. Experimental results of the proposed antenna exhibit good radiation pattern, stable gain, and consistent group delay performances. The time domain behavior of the antenna with and without resonator is analyzed. More »»

2011

P. Mahender, Dr. Natarajamani S., and .K.Behera., S., “H-Shaped Dielectric Resonator Antennafor UWB application”, 2011.[Abstract]


The design of Ultra wideband dielectric resonator antenna with low dielectric constant is presented in this article. The antenna consists of H-Shape dielectric resonator (DR) fed by Microstrip line and a slotted ground. Parametric studies, time domain analysis of the antenna are presented. The parameters are designed and simulated using CST Microwave studio. The constant group delay, path loss and the calculated correlation factor shows that the antenna is well suited for UWB applications. More »»

2011

Dr. Natarajamani S., Behera, S. K., and Patra, S. K., “A triple band-notched planar monopole antenna for ultra-wide band applications”, Microwave and optical technology letters (Willey Publication), vol. 54, no. 2, pp. 539–543, 2011.[Abstract]


This article presents the compact planar antenna with 3.5/5.5/8.2 GHz triple band-notched characteristics. The antenna consists of an octagon shape patch with 50 Ω transmission line. By etching two C-shaped slots in the patch and adding pair of L-shaped resonator coupled to the radiating patch, band-rejected filtering properties in the WiMAX/WLAN/ITU bands are achieved. The proposed ultrawide band (UWB) antenna is optimized to operate in the frequency band from 3 to 11 GHz for VSWR < 2. Measured results confirm that the antenna is suitable for UWB applications because of its compact size and high performance. More »»

Publication Type: Conference Paper

Year of Publication Title

2012

A. K Reddy, Dr. Natarajamani S., and Behera, S. K., “Antipodal vivaldi antenna UWB antenna with 5.5 GHz band-notch characteristics”, in International Conference on Computing, Electronics and Electrical Technologies [ICCEET] , 2012.[Abstract]


This paper presents a compact antipodal Vivaldi antenna for UWB allocation with band dispersion characteristics. The main purpose of this design is the reduction of three parameter such as transient distortion, reflection co-efficient & surface wave loss. The proposed antenna has the capability to operate over the bandwidth
3-11GHz at return loss< -10 dB, except the bandwidth of 5-6GHz for WLAN .By cutting Q- shaped slot in the radiating patch frequency band notch created. The
antenna is successfully designed and simulated, it showing broadband matched impedance, stable gain and radiation pattern over a operating bandwidth.

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2011

Dr. Natarajamani S., .K.Behera, S., and .K.Patra, S., “Planar UWB Fractal Antenna with Band-Notched Characteristics”, in International Conference on Electronic Systems (ICES-2011), 2011.

2011

Dr. Natarajamani S., .S.K, B., and .S.K, P., “A Planar UWB antenna with Band notch characteristics”, in International Conference on Electronic Systems, 2011.

2010

Dr. Natarajamani S., Behera, S. K., and Patra, S. K., “Planar ultrawideband antenna with 5.5GHz band dispensation characteristics”, in 2010 Annual IEEE India Conference (INDICON), 2010.[Abstract]


A compact and simple design of a CPW-fed planar antenna for ultra-wideband application with a band-notch characteristic is presented. The proposed antenna consists of a rectangular metal patch on a printed circuit board fed by a 50Ω coplanar waveguide (CPW) with an overall size of 32×30×1.6mm3. By cutting a C-shaped slot in the rectangular radiating patch, a frequency band notch will be created. The proposed antenna yields an impedance bandwidth of 3.1-10.6GHz with VSWR≤2, except the bandwidth of 5-6GHz for WLAN. The bandwidth and central frequency of the notched band can be adjusted with ease by proper selection of C-shaped slot. The parameters simulated by CST Microwave Studio. The antenna is successfully designed and simulated. Showing broadband matched impedance, stable gain and radiation patterns over an operating bandwidth. More »»

2009

Dr. Natarajamani S., .S.K, B., .S.K, P., and .R.K, M., “CPW-FED Octagon shape slot Antenna for UWB Application”, in IEEE 5th International conference on Microwaves, Antenna Propagation and Remote Sensing, India., 2009.

Faculty Research Interest: