1. Microwave passive devices

2. Microsrtrip antennas

3. Metamaterials

4. RFIC & RF MEMS

1. Student author award at IEEE Applied Electromagnetic conference (AEMC) Dec. 2009, Kolkata

Teaching

1. 8 years

Research

1. 4.5 Years

Industry

1. 1 year

1. Life member-ISTE

2. Member-IEEE

1. Chair, IEEE AP-S, Madras Chapter, 2018

2. Reviewer - IEEE Microwave and Wireless Components Letters

3. Reviewer - IEEE Transaction on Antennas and Wave Propagation

4. Reviewer - IEEE Transactions on Circuits And Systems II (TCAS II)

5. Reviewer - IET Electronics Letters

6. Reviewer - Progress in Electromagnetic Research

7. Reviewer - International Journal of Electronics and Communication

8. Reviewer - Radio Engineering

9. Reviewer - International Journal of Ultra Wideband Communication

1. RF and Microwave Circuit Design

2. Electromagnetic Interference and Compatibility

3. Electronic Manufacturing and Packaging

4. Data Networks

5. Antenna Theory and Design

6. Analog and Digital Communication

7. Microprocessor and Microcontrollers

8. Digital Signal Processing and Architecture

1. Adeline Melita, Chandu D S and S. S. Karthikeyan , A Compact Dual-band Frequency Selective Surface for Gain Enhancement of a Dual-band Antenna, Springer- Optical and Wireless Technologies, pp. 607-614, 2018

1. D. S. Chandu and S. S. Karthikeyan, "Broadband circularly polarized printed monopole antenna with protruded L-shaped and inverted L-shaped strips", Microwave and Optical Technology Letters, Vol. 60, no. 1, pp. 242–248, 2018.

2. Rusan Kumar Barik, Rajender, R and S. S. Karthikeyan, "A Miniaturized Wideband Three-Section Branch-Line Hybrid With Harmonic Suppression Using Coupled Line and Open-Ended Stub ", IEEE Microwave and Wireless Components Letters, Vol. 27, no. 12, pp. 1059-1061, 2017.

3. Rusan Kumar Barik and S S Karthikeyan, "Design of dual/tri-frequency impedance transformer with ultra-high transforming ratio", Vol. 9, no. 10, pp. 1951-1960, 2017.

4. Idury Satya Krishna, Rusan Kumar Barik, SS Karthikeyan, "A dual-band crossover using cross-shaped microstrip line for small and large band ratios", International Journal of Microwave and Wireless Technologies, Vol. 9, no. 8, pp. 1629-1635, 2017.

5. R. K. Barik and S. S. Karthikeyan, "Dual-Frequency Impedance Transformer Using Coupled-Line For Ultra-High Transforming Ratio", Radio Engineering, Vol. 26, no. 4, pp. 1067-1074, 2017.

6. Rusan Kumar Barik and S. S. Karthikeyan, "A novel quad-band impedance transformer with ultra-high transforming ratio", International Journal of Electronics and Communication, Vol. 78, pp. 157–161. Aug. 2017.

7. Rusan Kumar Barik and S. S. Karthikeyan,"A novel design of ultra‐high impedance transforming ratio quad‐band matching network", Microwave and Optical Technology Letters, Vol. 59, no. 8, pp. 2021-2026, 2017.

8. K.V. Phanikumar and S. S. Karthikeyan, “Highly compact wideband double-section rat-race hybrid with harmonic suppression using series and shunt stepped impedance transmission lines”, International Journal of Microwave and Wireless Technologies, Vol. 9, no. 4, pp. 797-803, 2017.

9. Rusan Kumar Barik, K.V. Phanikumar and S. S. Karthikeyan, “Design of a Dual-Band Microstrip Branch-Line Balun Using T-Shaped Coupled Lines”, Microwave and Optical Technology Letters, Vol. 59, no. 5, pp. 1197-1202, 2017.

10. Idury Satya Krishna, Rusan Kumar Barik, S. S. Karthikeyan and Priyanka Kokil, “A Miniaturized Harmonic Suppressed 3 dB Branch Line Coupler Using H-shaped Microstrip Line”, Microwave and Optical Technology Letters, Vol. 59, no. 4, pp. 913-918, 2017.

11. Chandu D S and S S Karthikeyan, “A Novel Broadband Dual Circularly Polarized Microstrip-Fed Monopole Antenna”, IEEE Transactions on Antennas and Propagation, Vol. 65, no. 3, pp. 1410 - 1415, 2017.

12. K.V. Phanikumar and S. S. Karthikeyan, “Miniaturised quadrature hybrid coupler using modified T-shaped transmission line for wide-range harmonic suppression”, IET Microwaves, Antennas & Propagation Vol. 10, no. 14, pp. 1522-1527, 2016.

13. Rusan Kumar Barik, K.V. Phanikumar and S. S. Karthikeyan, “Design of a Quad-Band Branch Line Balun Using Extended Pi-Shaped Coupled Lines”, IEEE Microwave and Wireless Components Letters, Vol. 26, no. 10, pp. 771-773, 2016.

14. Rusan Kumar Barik, K.V. Phanikumar and S. S. Karthikeyan, “A compact wideband harmonic suppressed 10 dB branch line coupler using cascaded symmetric PI sections”, Microwave and Optical Technology Letters, Vol. 58, no. 7, pp. 1610-1613, 2016.

15. K.V. Phanikumar and S. S. Karthikeyan, “A novel two section branch line coupler employing different transmission line techniques”, International Journal of Electronics and Communication, Vol. 70, no. 5, pp. 738-734, 2016.

16. K. V. Phanikumar and S. S. Karthikeyan, “Wideband three section branch line coupler using triple open complementary split ring resonator and open stubs”, International Journal of Electronics and Communication, Vol. 69, no. 10, pp. 1412-1416, 2015.

17. K. V. Phanikumar and S. S. Karthikeyan, “A compact 1:4 lossless t-junction power divider using open complementary split ring resonator”, Radio Engineering, Vol. 24, no. 3, pp. 717-721, 2015.

18. S. S. Karthikeyan and Rakhesh Singh Kshetrimayum, “Compact and Wide Stop band Lowpass Filter Using Open Complementary Split Ring Resonator and Defected Ground Structure”, Radio Engineering, Vol. 24, no. 3, , pp. 708-711, 2015.

19. S. S. Karthikeyan and R. S. Kshetrimayum “Compact, harmonic suppressed power divider using open complementary split-ring resonator”, Microwave and Optical Technology Letters (MOTL), Vol. 53, pp. 2897-2899, 2011.

20. S. S. Karthikeyan and R. S. Kshetrimayum “Size miniaturized rat-race coupler using open complementary split ring resonator”, IEICE Transaction on Electronics, Vol. E94-C, pp. 1601-1604, 2011.

21. S. S. Karthikeyan and R. S. Kshetrimayum, “Compact, Deep and Wide Rejection Bandwidth Lowpass Filter using Open Complementary Split Ring Resonator, Microwave and Optical Technology Letters (MOTL), Vol. 53, pp. 845-848, 2011.

22. S. S. Karthikeyan and R. S. Kshetrimayum “Composite right/left handed transmission line based on open slot split ring resonator”, Microwave and Optical Technology Letters (MOTL), Vol. 52, pp. 1729-1731, 2010.

23. S. S. Karthikeyan and R. S. Kshetrimayum, Notched UWB bandpass filter using Complementary Single Split Ring Resonator”, IEICE Electronics Express (ELEX), Vol. 7, pp. 1290-1295, 2010.

24. S. S. Karthikeyan and R. S. Kshetrimayum, "Compact Wideband Bandpass Filter using Open Slot Split Ring Resonator and CMRC," Progress In Electromagnetics Research Letters (PIERL), Vol. 10, pp. 39-48, 2009.

25. S. S. Karthikeyan and R. S. Kshetrimayum, "Harmonic suppression of parallel coupled microstrip line bandpass filter using CSRR," Progress In Electromagnetics Research Letters (PIERL), Vol. 7, 193-201, 2009.

26. R. S. Kshetrimayum, S. S. Karthikeyan and D. Dey, “Bandgap determination of triangular lattice EBGs in the ground plane”, International Journal of Electronics and Communication, Vol. 63, no. 8, pp. 699-702, 2009.

27. R. S. Kshetrimayum, S. Kallapudi and S. S. Karthikeyan, “Stop Band Characteristics for Periodic Patterns of CSRRs in the Ground Plane and its Applications in Harmonic Suppression of Band Pass Filters”, International Journal of Microwave and Optical Technology, Vol. 3, no. 2, pp. 88-95, 2008.

28. R. S. Kshetrimayum, S. Kallapudi and S. S. Karthikeyan, “Stopband Characteristics for Periodic Patterns of CSRRs in the Ground Plane”, IETE Technical Review, Vol. 24, no 6, pp 449-460, 2007.

1. Idury Satya Krishna, Rusan Kumar Barik, and S. S. Karthikeyan, "Analysis and Design of a Planar Crossover for Dual-Frequency Applications", IEEE INDICON, IIT Roorkee, Dec. 2017.

2. Chandu DS, Rusan Kumar Barik, and S S Karthikeyan, “Triple-Band Circularly Polarized Antenna on a Two-Layered High Impedance Surface With Two In-Phase Reflection Bands," In Proc. of 47th European Microwave Conference (EuMC), Nuremberg, Germany, Oct. 2017.

3. Rusan Kumar Barik, Chandu DS, and S S Karthikeyan, “Broadband Coupled Line Matching Network for Two Dissimilar Port Reference Impedances," In Proc. of 47th European Microwave Conference (EuMC), Nuremberg, Germany, Oct. 2017.

4. Soumyakanta Pradhan, Rusan Kumar Barik, Pradyumna Kumar Bishoyi, Karthikeyan S S and D S Chandu, "A Novel Dual-Band Matching Network Using Modified T-Shaped Line and Its Application", in Proc. of International Conference on Wireless Communications, Signal Processing and Networking, Chennai, 2017.

5. Adeline Melita, Chandu DS and S. S. Karthikeyan, “Gain Enhancement of a Microstrip Patch Antenna Using a Novel Frequency Selective Surface,” in Proc. of NCC-2017, IIT Madras.

6. Idury Satya Krishna, Rusan Kumar Barik, and S. S. Karthikeyan, “'A Miniaturized Wideband Bandpass Filter Based on 3λ/4 Resonator Loaded with Stepped Impedance,” ,” in Proc. of NCC-2017, IIT Madras.

7. K.V.Phani Kumar, Rusan Kumar Barik, Idury Satya Krishna and S. S. Karthikeyan, “'Design of Compact 1800 Hybrid Coupler for Unequal Power Division Ratio Using a High Slow Wave Structure,” in Proc. of NCC-2017, IIT Madras.

8. Chandu DS, S. Pradhan and S. S. Karthikeyan, “A wideband substrate integrated waveguide slotted array antenna with multimode and multidirectional characteristics”, in Proc. Annual IEEE INDICON, IISc Bangalore, 2016

9. Rusan Kumar Barik, R Siddiqui, K.V.Phani Kumar, S. S. Karthikeyan, “Design of a novel dual-band low noise amplifier incorporating dual-band impedance transformer”, in Proc. International Conference on Signal Processing and Communication (SPCOM), IISc Bangalore, 2016.

10. Chandu DS, S. Pradhan and S. S. Karthikeyan, “SIW Based Modified Slotted Array Antenna with Circular Polarization for X, Ku and K Band Communications”, in Proc. European Microwave Conference (EuMC), London, 2016.

11. Rusan Kumar Barik, K.V. Phanikumar and S. S. Karthikeyan, “Compact wideband 3dB branch line coupler with multiple symmetric PI section”, in Proc. European Microwave Conference (EuMC), Paris, 2015.

12. Chandu DS, S.S. Karthikeyan, K.V.P. Kumar, “Reduction of mutual coupling in a two element patch antenna array using sub-wavelength resonators”, in Proc. National Conference on Communication (NCC), IIT Bombay, 2015.(Received the travel grant from NI)

13. Rusan Kumar Barik and S.S. Karthikeyan, “Design of a novel dual-band impedance transformer using coupled lines”, in Proc. IEEE Applied Electromagnetic Conference (AEMC), IIT Guwahati, 2015.

14. Purushothaman. B, K.V. Phani Kumar, and S. S. Karthikeyan, “Dual-Band Bandstop Filter Using Single Tri-section Stepped Impedance Open Stub”, in Proc. International Conference on Microwave and Photonics, ISM Dhanbad, 2015.

15. P K Bishoyi, S. S. Karthikeyan, “Design of a two stage Ku band low noise amplifier for satellite applications”, in Proc. International Conference on Communications and Signal Processing (ICCSP),, 2015.

16. R. K. Barik, P. K. Bishoyi, S. S. Karthikeyan, “Design of a Novel Dual-band Impedance Transformer”, in Proc. IEEE International Conference on Electronics, Computing and Communication, IIIT Bangalore, 2015.

17. K. V. P. Kumar, S. S. Karthikeyan, “A compact and high performance band-stop filter using open complementary split ring resonator”, in Proc. National Conference on Communication, IIT Delhi, 2013.

18. K. V. Phanikumar and S. S. Karthikeyan, “A novel design of rat race coupler using defected microstrip structure and folding technique”, in Proc. IEEE Applied Electromagnetic Conference (AEMC), KIIT Bhubaneshwar, 2013. (Finalist of student paper competition)

19. M. Arulvani; S. S. Karthikeyan; N. Neelima, “Investigation of process variation on register files in 65nm technology”, in Proc. International Conference on Emerging Trends in VLSI, Embedded System, Nano Electronics and Telecommunication System, 2013.

20. S. S. Karthikeyan and M. Arulvani, “Double negative metamaterial design using open split ring resonator”, IEEE Students Technology Symposium (TechSym). 2010.

21. S. S. Karthikeyan, M. B. Manapati and R. S. Kshetrimayum, “Reduction of specific absorption rate in human tissues using split ring resonators”, in Proc. IEEE Applied Electromagnetics Conference (AEMC), Kolkatta, 2009. {Student Author Award for S. S. Karthikeyan}

22. S. S. Karthikeyan and R. S. Kshetrimayum, “Slot split ring resonators and its applications in performance enhancement of microwave filter”, in Proc. IEEE Applied Electromagnetics Conference (AEMC), Kolkatta, 2009. . {Student Author Award for S. S. Karthikeyan}

23. S. S. Karthikeyan and R. S. Kshetrimayum, “Performance Enhancement of Microstrip Bandpass Filter using CSSRR”, in Proc. International Conference on Advances in Computing, Control, and Telecommunication Technologies, Trivandrum. pp. 67-70. 2009. Citations: 6

24. R. S. Kshetrimayum, S. S. Karthikeyan and V. K. Meduru, “ANN for fast and accurate design of spiral inductors”, in Proc. National Conference on Communications (NCC), pp. 54-58. 2009.

25. R. S. Kshetrimayum, V. K. Meduru and S. S. Karthikeyan, “ANN for fast and accurate determination of resonant frequency and quality factor for CSSRR in ground plane”, in Proc. Annual IEEE India Conference (INDICON), Bangalore, 2007.

26. R. S. Kshetrimayum, V. K. R. Cholletti and S. S. Karthikeyan, “Novel wide stopband filter using CSRR and open stubs”, in Proc. Annual IEEE India Conference (INDICON), India, 2007.

27. R. S. Kshetrimayum, D. Dey and S. S. Karthikeyan, “Performance comparison of micromachined patch antenna with EBGs and soft structure substrate”, in Proc. Annual IEEE India Conference (INDICON), Bangalore, 2007.

28. R. S. Kshetrimayum, R. Pillalamarri and S. S. Karthikeyan, “Single printed monopole antenna and notched antenna with triangular tapered feed lines for triband and pentaband applications”, in Proc. Annual IEEE India Conference (INDICON), India, 2007.