Qualification: 
M.Tech, BE
Email: 
nb_sabarish@cb.amrita.edu
Phone: 
9443713945

Sabarish Narayanan B. joined the Department of Electronics and Communication Engineering, Amrita School of Engineering, Coimbaotore, as Lecturer in 2002, and is currently serving as Assistant Professor in the same Department since 2009.

He received his undergraduate degree in Engineering (B.E) in Electronics and Communication from Bharathiar University, Coimbatore, in 2002, and post graduation (M.Tech) in Radio Frequency and   Microwave Engineering from IIT Kharagpur in 2007. Currently, along with his academic teaching, he is pursuing Doctoral studies in the area of developing Low Cost Electromagnetic Absorbers.

The main areas of his teaching domain and research pertain to Electromagnetic Theory and applications, Sustainable Engineering and Agriculture Electronics. 

He has to his credit research papers in international journals like “Electromagnetics, Applied Mechanics and Materials and International Journal of Nanoscience, ten papers in reputed international conferences like International Conference on Electromagnetic Interference and Compatibility (INCEMIC) and International Conference on Advanced Nanomaterials and Nanotechnology (ICANN), and eight papers in various National Conferences in the aforementioned subject areas. Nine of his publications are indexed in Scopus.

He has to his credit two completed industrial projects, in collaboration with Honeywell Technology Solutions Madurai (2009) and Shree Chithra Tirunal Institute for Medical Science and Technology (SCTIMST) –Trivandrum (2010) respectively. Sabarish was a resource person for the IEEE International Workshop on Electromagnetics in March 2013, and for the Faculty Development Programme on Transmission Lines and Waveguides, organized by Anna University in 2011, and IETE FDPs on Electromagnetic Fields.

He was actively involved in the European Research and Educational Collaboration with Asia (EURECA) program, guiding under graduate and post graduate projects from 2008-2010.  He was a reviewer for the IEEE Transactions on Electromagnetic Compatibility in the year 2013.

He was instrumental in obtaining funding to the tune of Rs.5 Lakhs from ISRO, DRDO, WIPRO and CTS for conducting the National Conference series Recent Trends in Communication, Computation and Signal Processing (RTCSP) during the year 2009, 2010, 2011, 2013 and 2014.

Sabarish Narayanan B is an associate member of the Indian Society for Technical Education (ISTE), life member of the Institute of Electronics and Telecommunication Engineers (IETE), India and Life Member of Society of EMC Engineers (India).

Research Expertise

Major Research Areas

  • EM characterization of materials for Electronic Applications
  • Development of Low Cost Materials for Electromagnetic Absorber
  • Development of EM based techniques for Agricultural Applications  and Food Engineering
     

Academic Projects 

S.No. Project Title UG/PG Outcome/Scopus Indexed paper
1. Analyses of EM Shielding Effectiveness of Blister Pack Loaded Cement Composites UG: May 2015 – June 2016 Filing of Patent - Underway
2. Microwave Characterization of Ecosand for EMI tolerant Constructions UG : May 2014 –June 2015 Paper in Applied Mechanics and Materials-2015
3. Characterization of EM Properties of Fly Ash UG: May 2010- June 2011 Paper in Applied Mechanics and Materials – 2012
4. Adaptive Algorithms for Digital Beam forming in Smart Antennas UG: May 2010- June 2011 Paper in ICRTIT 2011
5.  Analysis of Reflective Type Phase Shifter for Millimeter Wave Application PG: May 2010- June 2011 Paper in  ICSCCN 2011
6. Analysis of Planar Multilayered Dielectric Structures As Electromagnetic Absorbers For Shielding Applications UG: May 2008- June 2009 Paper in Electromagnetics –Taylor and Francis 2011 (SCI indexed)

Laboratory Facilities

The Radio Frequency and Microwave laboratory was established in the year 1996. The lab is equipped with full-fledged X band wave guide bench with Klystron and Gunn based microwave sources and Scalar power meter. Together with the waveguide peripherals including directional couplers, magic tees, circulators, tuners provide an excellent set up for the students to get a real time feel of wave propagation concepts and its applications. A complete VHF antenna measurement system was commissioned in the year 2004 with a variety of antennas including dipoles, monopoles, yagi uda and loop structures. The lab has five personal computer systems to provide exposure to the students in the area of electromagnetic simulation employing software.Apart from catering to  the regular academic laboratory requirements, students are exposed to innovative experiments involving radar cross section and microwave material characterization. Over the last three years, the lab has undertaken rigorous research and development activities in the area of electromagnetic characterization of fly ash and development of antennas on cylindrical substrates. This has resulted in a good number of publications in reputed international journals including Electromagnetics (Taylor and Francis), Applied Mechanics and Materials, and international conferences like INCEMIC. Over the next three years, it is proposed to have a fully developed microwave instrumentation for exploring the possibility of undertaking external funded projects and consultancy activities in the area of electromagnetic material characterization and developing EM based Non destructive Testing techniques for Agricultural and Food products.   Presently an Anechoic Chamber for frequency range above 1 GHz is under construction.

Flexible Low Weight Absorber Prototypes Developed in the Lab

 

 

Opportunities for projects UG/PG

EM Characterization of Materials for Low Cost Absorbers

  • Analysis of Fly ash for Absorber applications
  • Investigate the scope of employing ash from Steel Industry, cement industry and Iron Smelters
  • Foundry Sand analysis for Microwave properties
  • Cement based Composites for EMI mitigation at Structural Level
  • Analysis of Agricultural Products for Possible electronic Applications
     

Developing Non Destructive Testing Techniques for Food and Agricultural industry

  • Theoretical Analysis of Liquid Mixtures for analyzing Milk Quality
  • Developing Capacitance based testing Schemes for Sugarcane
  • EM based Testing techniques for Coconut
  • Analysis of Solid/Liquid Mixtures – Pesticide Detection in Mango Pulp
     

Funded Projects

Project Title : Development of Electromagnetic Absorbers using Low Profile Composites for Strategic Applications
Amount : Rs. 3 Lakhs
Agency : Amrita Vishwa Vidyapeetham (Internal Seed Grant)
Grant Duration:  August 2016 – July 2017

Teaching

  1. Applied Electromagnetic Theory
  2. Transmission Line Theory
  3. Radio Frequency Engineering
  4. Antenna Systems and Design
  5. Electronic Devices and Circuits
     

Publications

Publication Type: Conference Proceedings

Year of Publication Publication Type Title

2016

Conference Proceedings

S. Narayanan B, R, K., and Dr. Jayakumar M., “Microwave Absorber Characterization of Fly Ash Based Planar Composites”, International Conference on Material Science and Technology (ICMTECH 2016). New Delhi, 2016.

2014

Conference Proceedings

A. U, .Nagabalaji, S., .Nydhruv, L., ,, K.S, P. Shakthi, .Vaidyalingam, K., and B, S. Narayanan, “Theoretical Investigations on Determining the Relative Permittivity of Ecosand”, International Conference on Environment & Sustainable Technologies (iCEST 2014). Manipal Institute of Technology, p. 13, 2014.

2012

Conference Proceedings

S. Narayanan B, Ramalingam, S., and .Jayakumar, M., “A Novel Analytical Model for Wave Propagation through High Frequency Circuit Substrates for analysis of Wireless Interconnects”, Twelfth International Conference on Electromagnetic Interference and Compatibility (INCEMIC 2012). pp. 507-510, 2012.

2011

Conference Proceedings

A. .K.S, .G, G., P, G. Kashyap, Nair, R. Unny, R, S., and B, S. Narayanan, “Theoretical Investigation of Relative Permittivity of Fly Ash for Potential Electronic Applications”, International Conference on Microwaves, Antennas and Remote Sensing (ICMARS). Institute of Radio Science India and URSI, pp. 178-180, 2011.

2011

Conference Proceedings

S. Sasikumar and B, S. Narayanan, “Analysis Reflective Type Phase Shifter for Millileter Wave Application”, International Conference on Signal Processing, Communication and Networking Technologies(ICSCCN2011). IEEE, pp. 342-346, 2011.[Abstract]


Phase Shifters are the most important component in phased array antenna system. The antenna system that we are using for millimeter wave communication is phased arrays. Phased array antennas are used to improve the gain and directivity and this can be made possible by the use of phase shifters. In this paper we have designed reflective type phase shifters and plotted its performance. The operating frequency is 60GHz and we have obtained some phase shifts at this frequency range. Here we have used varactor and inductor as reflective load. For the first design using inductor, we got a phase shift 84.510 and for the second design using varactor the phase shift is 90.40-122.30. More »»

2011

Conference Proceedings

A. Shivam Prasad, Vasudevan, S., R, S., K, S. Ram, G, S., S, S., and B, S. Narayanan, “Kalman based Noramlised LMS Algorithm for Digital Beam Forming”, Third National Conference on Communication Networks. Vidya Academy of Science and Technology,Thrissur, 2011.

2011

Conference Proceedings

S. R, K.Vardhan, S., V.C, H. Haran, P, G. Kashyap, R, L., G, G., and B, S. Narayanan, “Radio Planning for GSM Networks – A Case Study”, ELECTRON - Technical Report of Department of ECE, Special Issue, Third National Conference on Recent Trends in Communication, Computation and Signal Processing (RTCSP’11), vol. 3. pp. 332-335, 2011.

2010

Conference Proceedings

V. Gopal K, .U.Radhagayathri, K., ,, Parimalam, B., B, S. Narayanan, and Namboori, P. K., “Computational Bio-Mems Analysis of Molecular Motors as Targets for Cancer Therapy”, ELECTRON - Technical Report of Department of ECE, Special Issue, Second National Conference on Recent Trends in Communication, Computation and Signal Processing, vol. 2. pp. 185-188, 2010.

2010

Conference Proceedings

A. Iyyapan, Mariaapan, A., M, N. Kumar, P, S., R, K. Prasad, R, S., and B, S. Narayanan, “Electromagnetic Analysis of Carbon Nano Tube Surfaces for Salisbury Screen”, Eleventh International Conference on Electromagnetic Interference and Compatibility (INCEMIC 2010). pp. 173-180, 2010.

2009

Conference Proceedings

A. S, B, V., K, S., Krishnan, S., P, S., Karthika, R., and B, S. Narayanan, “Design of Planar Multi Layered Dielectric Structures using Binomial Matching Technique”, ELECTRON - Technical Report of Department of ECE, Special Issue, Proceedings of First National Conference on Recent Trends in Communication and Signal Processing (RTCSP’09), vol. 1. pp. 71-77, 2009.

2008

Conference Proceedings

S. Narayanan B, Ghosh, B., and Ghosh, S., “Antenna factor computation for planar antenna using surface integral equation”, 10th International Conference on Electromagnetic Interference & Compatibility, 2008. INCEMIC 2008. , vol. 21. IEEE, pp. 329-334, 2008.[Abstract]


A novel technique to compute the antenna factor of a planar antenna, using surface integral equation is presented. The experimental nature of conventional antenna factor determining methods demand, that the actual experiment be carried under the same conditions under which the EMC antenna calibration was carried out. Antenna Factor data computed through analytical techniques aids in eliminating this constraint. A probe fed rectangular patch is considered. Antenna factor computation requires the knowledge of current density induced in the probe for various external fields. Scattering analysis is carried out. The basic equivalence concept of replacing the conducting surfaces with surface electric currents and dielectric surfaces with surface electric and surface magnetic currents is adopted. The integral equations are formulated using appropriate boundary conditions. The conventional Method of Moments solution procedure is adopted to determine the surface current values. The induced probe current density, computed over a range of frequencies, aid in calibrating the rectangular patch for its antenna factor. More »»

2008

Conference Proceedings

Dr. Jayakumar M., Dr. Ramanathan R., and B, S. Narayanan, “Air Substrate Based Shorted Rectangular Patch for Air Borne Vehicles”, International Conference on Aerospace Science and Technology (INCAST -2008). National Aerospace Laboratories, Bangalore, p. 139, 2008.

2008

Conference Proceedings

A. S, K, S., Krishnan, S., P, S., B, V., B, S. Narayanan, and Karthika, R., “Analysis and Performance of Planar Multi Layered Electromagnetic Absorbers for Shielding Applications”, National Symposium on Instrumentation (NSI 33). Vishakhapatnam, pp. 35-36, 2008.

2008

Conference Proceedings

S. Narayanan B, “Analysis of Wide Band Nature of Microstrip Antennas”, Proceedings of the Fourth National Conference on Recent Trends in Communication Techniques (NATCON -08). Nagercoil, pp. 151-154, 2008.

Publication Type: Journal Article

Year of Publication Publication Type Title

2015

Journal Article

S. Naveenaa, Sruthi, S., and B, S. Narayanan, “Microwave Characterization of Ecosand for Electromagnetic Interference (EMI) Shielded Construction”, Applied Mechanics and Materials, vol. 813-814, pp. 263-266, 2015.[Abstract]


Experimental study on microwave attenuation of ecosand is presented. Ecosand is a by-product of cement industry, and presents good alternative for natural river sand. Ecosand is a composite mixture, primarily containing silica and alumina. Microwave characterization provides good value enhancement for ecosand, encouraging its utilization in construction of EMI shielded buildings including safety vaults, server chambers and critical defense installations. Wave guide based studies on virgin ecosand and ecosand fly ash mixtures are conducted. Varying proportions of ecosand - flyash mixtures are considered. Reflected and transmitted power levels are measured. The preliminary results provide satisfactory EMI characteristics for a 60-40 ecosand-fly ash mixture. Further experiments on shielding effectiveness measurement of cement mortar composite, incorporating ecosand-fly ash mixture can provide effective conclusions on the microwave attenuation characteristics, and its subsequent utilization for EMI tolerant constructions.

More »»

2012

Journal Article

V. N. Sreenivas, Karthik, D., Kumar, V. Aravinth, Sidharth, V. D., Sundaram, T. M., Sarkar, S., and B, S. Narayanan, “Determination of complex permittivity of fly ash for potential electronic applications”, Applied Mechanics and Materials, vol. 110-116, pp. 4292-4296, 2012.[Abstract]


Disposal of fly ash obtained from thermal power plants is a major environmental concern. Fly ash contains large proportions of silica and ferrites. Investigation of its prospects as an electronic material provides scope for enhanced fly ash utilization. This involves measurement of relative permittivity and loss tangent. Experiments are carried out at X band frequencies in TE 10 mode using standard klystron waveguide setup. Shorted Waveguide Method is used to determine the complex permittivity. The complex transcendental equation obtained is solved using Genetic Algorithm. Experimental results are compared with theoretical estimates based on Landau Lifshitz Looyenga (LLL) equation. © (2012) Trans Tech Publications, Switzerland.

More »»

2011

Journal Article

Sa Pandi, B, S. Narayanan, and McGinn, V. Pa, “Analysis and design of planar multi-layered parabolic absorber for low-power applications”, Electromagnetics, vol. 31:6, pp. 448-459, 2011.[Abstract]


This article presents a detailed electromagnetic analysis of planar multi-layered dielectric structures for low-power industrial applications. Adopting the analogy between the multi-section transmission line transformers and planar multi layered dielectrics, the material properties of each layer are determined. Design of a novel planar multi-layered absorber, namely the parabolic absorber, has been proposed in the article. The transformer is designed using commercially available low-loss dielectric materials for a frequency of 10 GHz. The feasibility of the absorber is analyzed for both normal and oblique incidences. © 2011 Taylor & Francis Group, LLC.

More »»

2011

Journal Article

K. V. Gopal, Premkumar, P., Gopakumar, D., P. K. Krishnan Namboori, and B, S. Narayanan, “Insilico modeling and simulation of magnetic nanoparticles for the biological cell isolation technique”, International Journal of Nanoscience, vol. 10, no. 1-2, pp. 323-327, 2011.[Abstract]


Magnetic nanoparticles (MNPs) can be used in a wide variety of biomedical applications like contrast agents for magnetic resonance imaging, magnetic labeling, controlled drug release, hyperthermia, and in cell isolation. Most of these applications need distinct and controllable interactions between the MNPs and living cells and can be made possible by a proper functionalization technique. This paper describes a computational approach for the identification of magnetic nanoparticles for the development, design, and demonstration of a novel, incorporated system for selective and rapid removal of biological, chemical, and radioactive biohazards from human body. The attraction between an external magnetic field and the MNPs facilitate separation of a wide variety of biological materials. This principle can be used for the isolation and aggregation of wandering cancer cells from the blood or the bone marrow to make a proper and early diagnosis of leukemia. Similarly, toxins, kidney stones, and other unwanted particles in the human body can be easily diagnosed and removed by the same technique. Nanoparticle-sized iron oxides have been studied in this work by computational modeling and molecular dynamic (MD) simulation techniques. Structural, thermodynamic, and magnetic properties have been formulated. In this work, nanoparticles of size varying from 0.5 to 2.5 nm have been analyzed. Cell isolation ability of the nanoparticles has been compared based on the computational results. MNPs are biologically activated and permitted to bind with the targeted cells through various pathways, thereby allowing certain cellular compartments to be specifically addressed. Once the cells are identified, the preferred cellular compartments can be magnetically isolated and removed with the help of an external magnetic field. Out of the iron oxides analyzed in this work, 1.1 nm Fe 3O 4 is found to be most interacting with leukemia protein. Hence, leukemia cells can be effectively targeted, separated, and removed using Fe 3O 4 of the suggested dimension. © 2011 World Scientific Publishing Company.

More »»

2010

Journal Article

P. K. Krishnan Namboori, Vasavi, C. S., K Gopal, V., Gopakumar, D., Ramachandran, K. I., and B, S. Narayanan, “Thermal Analysis of Nanofluids Using Modeling and Molecular Dynamics Simulation”, AIP Conference Proceedings, vol. 1276, pp. 407-412, 2010.

2008

Journal Article

S. Narayanan B, Ghosh, B., and Ghosh, S., “Antenna Factor Computation for Planar Antenna Using Surface Integral Equation(Journal)”, Electromagnetic Compatibility Journal, vol. 21, pp. 6-10, 2008.

2005

Journal Article

Ra Harikumar, Sukanesh, Ra, and B, S. Narayanan, “Fuzzy techniques and fuzzy aggregation operators for classification of epilepsy risk level using EEG signal parameters”, Modelling, Measurement and Control C, vol. 66, pp. 43-62, 2005.[Abstract]


The purpose of this paper is to identify a suitable fuzzy classification model for epilepsy risk level from EEG signals. The parametric values such as energy, positive and negative peaks, sharp spikes and events are derived in each epoch of the EEG signal channels. Fuzzy techniques are used to classify the epilepsy risk levels in each epoch for all the channels, the risk level patterns obtained are found to have low values of sensitivity, performance and quality value. In order to increase the classification rate, an optimization technique is used and a quality value of 11.9 is achieved when compared to the value 6.25 achieved in the previous case. A comparison of fuzzy techniques without and with optimization is studied. The focal epilepsy problem in normal fuzzy classification is solved using this new approach. A group of six patients with known epilepsy findings are used in this study. An analytic study is undertaken for classification based on fuzzy aggregation operators. The results obtained from fuzzy classification with optimization method and aggregation operators are almost at the same level. The number of samples may be increased to improve the classification rate. More »»

Publication Type: Conference Paper

Year of Publication Publication Type Title

2011

Conference Paper

A. S. Prasad, Vasudevan, S., Selvalakshmi, R., Ram, K. S., Subhashini, G., Sujitha, S., and B, S. Narayanan, “Analysis of adaptive algorithms for digital beamforming in Smart Antennas”, in Recent Trends in Information Technology (ICRTIT), 2011 International Conference on, Chennai, Tamil Nadu, 2011, pp. 64-68.[Abstract]


Smart Antennas have been gaining popularity in the recent times, as a means to enhance data rate. The reason behind this development is the availability of high-end processors to handle the complex computations involved. The major advantage of digital beamformer (smart antennas) is that phase shifting and array weighing can be performed on digital data rather than in hardware. This paper analyses the performance of three adaptive algorithms - Least Mean Square (LMS), Recursive Least Square (RLS) and Conjugate Gradient Method (CGM) for computing the array weights. In this paper digital beamforming is also performed using kalman based normalised Least Mean Square algorithm. This adaptive algorithm promises very high rate of convergence, highly reduced mean square error and low computational complexity compared to the existing adaptive algorithms. The weights obtained by the above algorithm are then used to steer the antenna array beam in the direction of interest, thereby enhancing SNR. One of the major requirements for Long Term Evolution (LTE), high datarate, can hence be achieved by smart antennas. More »»

2009

Conference Paper

V. K Gopal, Vasavi, C. S., B, S. Narayanan, Ramachandran, K. I., Gopakumar, D., and P. K. Krishnan Namboori, “Thermal Analysis of Nanofluids Using Modeling and Molecular Dynamics Simulation”, in International Conference on Artificial Neural Networks, 2009.

2009

Conference Paper

V. K Gopal, Premkumar, P., Krishnan, N. P. K., B, S. Narayanan, and Dr. Deepa Gopakumar O. S., “In-Silico Modeling and Simulation of Magnetic Nanoparticles for the Biological Cell Isolation Technique”, in International Conference on Artificial Neural Networks (ICANN), IIT, Guwahati, 2009.

2003

Conference Paper

R. Harikumar and B, S. Narayanan, “Fuzzy techniques for classification of epilepsy risk level from EEG signals”, in TENCON 2003. Conference on Convergent Technologies for the Asia-Pacific Region, 2003, vol. 1, pp. 209-213.[Abstract]


The aim of this paper is to develop a fuzzy classification model for epilepsy risk level analysis from EEG signals. The parametric values such as energy, positive and negative peaks, sharp spikes and events are derived in each epoch of the EEG signal channels. Fuzzy techniques are used to classify the risk level in each epoch for all the channels; the risk level patterns obtained are found to have a low percentage of performance and quality value. In order to increase the classification rate, an optimization technique is used and a quality value of 11.9 is achieved when compared to the value 6.25 achieved in the previous case. A comparison of fuzzy techniques with and without optimization is studied. The focal epilepsy problem in normal fuzzy classification is solved using this new approach. A group of six patients with known epilepsy findings are used in this study. Further research work can be carried out in the classification of epilepsy risk level of a diabetic neuropathy patient. An analytic study is to be undertaken for classification, based on fuzzy aggregation operators and fuzzy discriminators. The number of samples may be increased to improve the classification rate. More »»

Faculty Research Interest: 
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