S. Pradhan, R. K. Barik, P. K. Bishoyi, S. Karthikeyan, and D. Chandu, “A novel dual-band matching network using modified t-shaped line and its application,” in 2017 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET), 2017, pp. 919–923.

K. V. Phani Kumar, R. K. Barik, I. S. Krishna, and S. Karthikeyan, “Design of compact 180° hybrid coupler for unequal power division ratio using slow wave structures,” in 2017 Twenty-third National Conference on Communications (NCC), 2017, pp. 1–5.

I. S. Krishna, R. K. Barik, and S. S. Karthikeyan, “Analysis and design of a planar crossover for dualfrequency applications,” in 2017 14th IEEE India Council International Conference (INDICON), 2017, pp. 1–5.

I. S. Krishna, R. K. Barik, and S. S. Karthikeyan, “A miniaturized wideband bandpass filter based on 3?/4 resonator loaded with stepped impedance,” in 2017 Twenty-third National Conference on Communications (NCC), 2017, pp. 1–5.

D. S. Chandu, R. K. Barik, and S. S. Karthikeyan, “Triple-band circularly polarized antenna on a two-layered high impedance surface with two in-phase reflection bands,” in 2017 47th European Microwave Conference (EuMC), 2017, pp. 600–603.

G. Kumari, R. K. Barik, P. Saxena, and S. S. Karthikeyan, “Compact substrate integrated waveguide power divider with slot-loaded ground plane for dual-band applications,” in 2018 IEEE MTT-S International Microwave and RF Conference (IMaRC), 2018, pp. 1–4.

D. Tharani, R. K. Barik, Q. S. Cheng, K. Selvajyothi, and S. Karthikeyan, “A compact wideband siw power divider with csrr and slots for ku and k band applications,” in 2019 IEEE MTT-S International Microwave and RF Conference (IMARC), 2019, pp. 1–4.

G. Kumari and R. K. Barik, “Compact out-of-phase wideband substrate integrated waveguide based power divider loaded by slots for ku and k band applications,” in 2019 International Conference on Communication and Signal Processing (ICCSP), 2019, pp. 0396–0399.

Y. Yu, Q. S. Cheng, and R. K. Barik, “Implementation of project-based learning in teaching an antenna and wave propagation course,” in 2020 IEEE International Conference on Teaching, Assessment, and Learning for Engineering (TALE), 2020, pp. 698–703.

N. C. Pradhan, K. Sholampettai Subramanian, R. K. Barik, and Q. S. Cheng, “Design of a compact siw diplexer with square cavities for c-band applications,” in 2020 URSI Regional Conference on Radio Science ( URSI-RCRS), 2020, pp. 1–4.

S. Kiran Kumar Dash, Q. S. Cheng, R. K. Barik, N. Charan Pradhan, and K. Sholampettai Subramanian, “A compact substrate integrated self-diplexing antenna for wifi and ism band applications,” in 2020 50th European Microwave Conference (EuMC), 2021, pp. 232–235.

N. C. Pradhan, K. S. Subramanian, R. K. Barik, P. Dalal, and Q. S. Cheng, “Design of compact shielded qmsiw based self-diplexing antenna for high-isolation,” in 2022 IEEE Wireless Antenna and Microwave Symposium (WAMS), 2022, pp. 1–4.

R. K. Barik, K. V. Phani Kumar, and S. S. Karthikeyan, “Compact wideband 3db branch line coupler with multiple symmetric pi section,” in 2015 European Microwave Conference (EuMC), 2015, pp. 275–278.

R. K. Barik and S. S. Karthikeyan, “Design of a novel dual-band impedance transformer using coupled lines,” in 2015 IEEE Applied Electromagnetics Conference (AEMC), 2015, pp. 1–2.

R. K. Barik, P. K. Bishoyi, and S. S. Karthikeyan, “Design of a novel dual-band impedance transformer,” in 2015 IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), 2015, pp. 1–4.

R. K. Barik, R. Siddiqui, K. Phani Kumar, and S. Karthikeyan, “Design of a novel dual-band low noise amplifier incorporating dual-band impedance transformer,” in 2016 International Conference on Signal Processing and Communications (SPCOM), 2016, pp. 1–5.

R. K. Barik, D. S. Chandu, and S. S. Karthikeyan, “Broadband coupled-line matching network for two dissimilar port reference impedances,” in 2017 47th European Microwave Conference (EuMC), 2017, pp. 89–92.

R. K. Barik, Q. S. Cheng, and K. S. Subramanian, “An automatic design approach for microstrip line impedance transformer for triple-band application,” in 2019 IEEE Asia-Pacific Microwave Conference (APMC), 2019, pp. 207–209.

R. K. Barik, Q. S. Cheng, and S. Koziel, “Design and experimental validation of highly compact branch-line balun for quad-band applications,” in 2021 IEEE MTT-S International Wireless Symposium (IWS), 2021, pp. 1–3.

R. K. Barik, Q. S. Cheng, and S. Koziel, “Quad-band impedance transformer for extremely high load impedance matching with out-of-band spurious response suppression,” in 2021 IEEE MTT-S International Wireless Symposium (IWS), 2021, pp. 1–3.

R. K. Barik, X. Wu, X. Liu, and S. Koziel, “High-isolation compact frequency reconfigurable cavity-backed antenna based on dielectric fluids with self-diplexing property,” in 2024 IEEE MTT-S International Wireless Symposium (IWS), Be?ing, China, 2024.

R. K. Barik, X. Liu, and S. Koziel, “Highly compact microfluidically frequency-tunable self-duplexing antenna for sub 6-GHz 5G applications,” in URSI Atlantic Radio Science Conference (URSI AT-RASC), Gran Canaria, Spain, 2024, pp. 275–278.

K. Phani Kumar, R. K. Barik, and S. Karthikeyan, “A novel two section branch line coupler employing different transmission line techniques,” AEU - International Journal of Electronics and Communications, vol. 70, no. 5, pp. 738–742, 2016.

R. K. Barik, K. V. Phani Kumar, 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.

R. K. Barik, K. V. P. Kumar, 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.

I. Satya Krishna, R. K. Barik, and S. S. 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.

I. S. Krishna, R. K. Barik, S. Karthikeyan, and P. 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.

R. K. Barik, K. V. Phani Kumar, and 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.

R. K. Barik and S. Karthikeyan, “A novel quad-band impedance transformer with ultra-high transforming ratio,” AEU - International Journal of Electronics and Communications, vol. 78, pp. 157–161, 2017.

R. K. Barik and S. S. Karthikeyan, “Dual-frequency impedance transformer using coupled-line for ultrahigh transforming ratio,” Radioengineering, vol. 26, no. 4, pp. 1067–1074, 2017.

R. K. Barik and S. S. Karthikeyan, “Design of dual/tri-frequency impedance transformer with ultra-high transforming ratio,” International Journal of Microwave and Wireless Technologies, vol. 9, no. 10, pp. 1951–1960, 2017.

R. K. 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.

R. K. Barik, R. Rajender, and S. S. Karthikeyan, “A miniaturized wideband three-section branch-line hybrid with harmonic suppression using coupled line and open-ended stubs,” IEEE Microwave and Wireless Components Letters, vol. 27, no. 12, pp. 1059–1061, 2017.

R. K. Barik, T. S. Laxman Deep, and S. S. Karthikeyan, “An equal split triple-band wilkinson power divider employing extended cross-shaped microstrip line,” Microwave and Optical Technology Letters, vol. 60, no. 10, pp. 2488–2492, 2018.

R. K. Barik, I. S. Krishna, and S. S. Karthikeyan, “Design of a tri-band 180-degree directional coupler with spurious suppression based on extended pi-shaped microstrip line,” Microwave and Optical Technology Letters, vol. 60, no. 7, pp. 1612–1619, 2018.

T. Duraisamy, R. K. Barik, K. Sholampettai Subramanian, and S. Kamatchi, “A novel siw based dual-band power divider using double-circular complementary split ring resonators,” Microwave and Optical Technology Letters, vol. 61, no. 6, pp. 1529–1533, 2019.

T. Duraisamy, R. K. Barik, Q. S. Cheng, S. Kamakshy, and K. S. Subramanian, “Miniaturized siw filter using d-shaped resonators with wide out-of-band rejection for 5g applications,” Journal of Electromagnetic Waves and Applications, vol. 34, no. 18, pp. 2397–2409, 2020.

S. K. K. Dash, Q. S. Cheng, and R. K. Barik, “A compact substrate integrated waveguide backed selfquadruplexing antenna for c-band communication,” International Journal of RF and Microwave ComputerAided Engineering, vol. 30, no. 10, e22366, 2020.

R. K. Barik, Q. S. Cheng, N. C. Pradhan, and K. S. Subramanian, “Design of miniaturized siw filter loaded with open-loop resonators and its application to diplexer,” Radioengineering, vol. 29, no. 4, pp. 609–616, 2020.

R. K. Barik, Q. S. Cheng, N. C. Pradhan, and K. S. Subramanian, “A compact siw power divider for dualband applications,” Radioengineering, vol. 29, no. 1, pp. 94–100, 2020.

R. K. Barik, Q. S. Cheng, N. C. Pradhan, and K. S. Subramanian, “Highly miniaturized wideband 3-db branch-line hybrid with second harmonic-suppression,” Microwave and Optical Technology Letters, vol. 62, no. 6, pp. 2248–2256, 2020.

R. K. Barik, Q. S. Cheng, S. K. K. Dash, N. C. Pradhan, and K. S. Subramanian, “Compact high-isolation self-diplexing antenna based on siw for c-band applications,” Journal of Electromagnetic Waves and Applications, vol. 34, no. 7, pp. 960–974, 2020.

R. K. Barik, Q. S. Cheng, S. K. K. Dash, N. C. Pradhan, and K. S. Subramanian, “Design of a compact orthogonal fed self-diplexing bowtie-ring slot antenna based on substrate integrated waveguide,” International Journal of RF and Microwave Computer-Aided Engineering, vol. 30, no. 11, e22422, 2020.

S. K. K. Dash, Q. S. Cheng, R. K. Barik, N. C. Pradhan, and K. S. Subramanian, “A compact triple-fed highisolation siw-based self-triplexing antenna,” IEEE Antennas and Wireless Propagation Letters, vol. 19, no. 5, pp. 766–770, 2020.

V. P. K. Kanaparthi, R. K. Barik, S. K. Idury, and K. S.S., “Compact branch-line balun using coupled-line and open stubs fabricated on paper substrate,” AEU - International Journal of Electronics and Communications, vol. 140, p. 153 953, 2021.

T. Duraisamy, R. K. Barik, Q. S. Cheng, S. Kamatchi, and K. Sholampettai Subramanian, “Compact dualband siw filters loaded with double ring d-shaped resonators for sub-6ghz applications,” Journal of Electromagnetic Waves and Applications, vol. 35, no. 7, pp. 923–936, 2021.

T. Duraisamy, S. Kamakshy, K. Sholampettai Subramanian, R. K. Barik, and Q. S. Cheng, “Compact wideband siw based bandpass filter for x, ku and k band applications,” Radioengineering, vol. 30, no. 2, pp. 288–295, 2021.

S. K. K. Dash, Q. S. Cheng, R. K. Barik, T. Khan, and K. Sholampettai Subramanian, “A compact dual-fed highly isolated siw based self-diplexing antenna,” AEU - International Journal of Electronics and Communications, vol. 132, p. 153 613, 2021.

A. A. Althuwayb, R. K. Barik, Q. S. Cheng, N. C. Pradhan, and K. S. Subramanian, “Design and experimental verification of compact dual-band siw power dividers with arbitrary power division,” Frequenz, vol. 75, no. 7-8, pp. 313–318, 2021.

R. K. Barik, S. Koziel, Q. S. Cheng, and S. Szczepanski, “Highly miniaturized self-diplexed u-shaped slot antenna based on shielded qmsiw,” IEEE Access, vol. 9, pp. 158 926–158 935, 2021.

R. K. Barik, Q. S. Cheng, N. C. Pradhan, and K. S. Subramanian, “A miniaturized quad-band branch-line crossover for gsm/wifi/5g/wlan applications,” AEU - International Journal of Electronics and Communications, vol. 134, p. 153 611, 2021.

N. C. Pradhan, K. S. Subramanian, R. K. Barik, and Q. S. Cheng, “Design of compact substrate integrated waveguide based triple- and quad-band power dividers,” IEEE Microwave and Wireless Components Letters, vol. 31, no. 4, pp. 365–368, 2021.

N. C. Pradhan, K. S. Subramanian, R. K. Barik, and Q. S. Cheng, “A shielded-qmsiw-based self-diplexing antenna for closely spaced bands and high isolation,” IEEE Antennas and Wireless Propagation Letters, vol. 20, no. 12, pp. 2382–2386, 2021.

N. C. Pradhan, K. S. Subramanian, R. K. Barik, and Q. S. Cheng, “A shielded qmsiw ultra-compact selfdiplexing antenna for wimax/wlan applications,” Journal of Electromagnetic Waves and Applications, vol. 36, no. 13, pp. 1869–1881, 2022.

N. C. Pradhan, K. S. Subramanian, R. K. Barik, and Q. S. Cheng, “A novel compact diplexer employing substrate integrated waveguide loaded by triangular slots for c-band application,” Journal of Electromagnetic Waves and Applications, vol. 36, no. 6, pp. 830–842, 2022.

B. A. F. Esmail, S. Koziel, L. Golunski, H. B. A. Majid, and R. K. Barik, “Overview of metamaterialsintegrated antennas for beam manipulation applications: The two decades of progress,” IEEE Access, vol. 10, pp. 67 096–67 116, 2022.

T. Duraisamy, S. Kamakshy, K. Sholampettai Subramanian, R. K. Barik, and Q. S. Cheng, “Design and implementation of compact tri- and quad-band siw power divider using modified circular complementary split-ring resonators,” International Journal of Microwave and Wireless Technologies, vol. 14, no. 10, pp. 1241–1249, 2022.

T. Duraisamy, S. Kamakshy, K. Sholampettai Subramanian, R. K. Barik, and Q. S. Cheng, “Compact hmsiw diplexer loaded with modified circular complementary split ring resonators for wimax/wlan applications,” Journal of Electromagnetic Waves and Applications, vol. 36, no. 14, pp. 1980–1995, 2022.

R. K. Barik, S. Koziel, and S. Szczepanski, “Highly-miniaturized dual-mode bandpass filter based on quarter-mode substrate integrated waveguide with wide stopband,” IEEE Access, vol. 10, pp. 42 163–42 170, 2022.

S. K. K. Dash, Q. S. Cheng, R. K. Barik, F. Jiang, N. C. Pradhan, and K. S. Subramanian, “A compact siw cavity-backed self-multiplexing antenna for hexa-band operation,” IEEE Transactions on Antennas and Propagation, vol. 70, no. 3, pp. 2283–2288, 2022.

R. K. Barik, S. Koziel, and S. Szczepanski, “Wideband highly-selective bandpass filtering branch-line coupler,” IEEE Access, vol. 10, pp. 20 832–20 838, 2022.

R. K. Barik and S. Koziel, “Compact, order extensible and wide-stopband bandpass filter based on siw cavity with rectangular ring slot,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 69, no. 12, pp. 4784–4788, 2022.

N. C. Pradhan, S. Koziel, R. K. Barik, A. Pietrenko-Dabrowska, and S. S. Karthikeyan, “Miniaturized dualband siw-based bandpass filters using open-loop ring resonators,” Electronics, vol. 12, no. 18, 2023.

N. C. Pradhan, S. Koziel, R. K. Barik, and A. Pietrenko-Dabrowska, “Bandwidth-controllable third-order band pass filter using substrate-integrated full- and semi-circular cavities,” Sensors, vol. 23, no. 13, 2023.

R. K. Barik, S. Koziel, and A. Pietrenko-Dabrowska, “Broad stopband, low-loss, and ultra-compact dual-mode bandpass filter based on HMSIRC,” Electronics, vol. 12, no. 13, 2023.

R. K. Barik and S. Koziel, “Ultracompact sirc-based self-triplexing antenna with high isolation,” Electronics, vol. 12, 2023.

R. K. Barik, S. Koziel, and E. Bernhar?sson, “Design of frequency-reconfigurable branch-line crossover using rectangular dielectric channels,” IEEE Access, vol. 11, pp. 38 072–38 081, 2023.

R. K. Barik and S. Koziel, “Design of compact self-quintuplexing antenna with high-isolation for pentaband applications,” IEEE Access, vol. 11, pp. 30 899–30 907, 2023.

N. C. Pradhan, K. S. Subramanian, R. K. Barik, and S. Koziel, “Shielded hmsiw-based self-triplexing antenna with high isolation for wifi/wlan/ism band,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 70, no. 6, pp. 1941–1945, 2023.

N. C. Pradhan, M. G. Reddy, K. S. Subramanian, R. K. Barik, S. Koziel, and Q. S. Cheng, “Microfluidic siw-based tunable self-diplexing antenna for sub-6 ghz band applications,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 70, no. 4, pp. 1435–1439, 2023.

R. K. Barik and S. Koziel, “Highly miniaturized self-quadruplexing antenna based on substrate-integrated rectangular cavity,” IEEE Antennas and Wireless Propagation Letters, vol. 22, no. 3, pp. 482–486, 2023.

R. K. Barik and S. Koziel, “A compact self-hexaplexing antenna implemented on substrate-integrated rectangular cavity for hexa-band applications,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 70, no. 2, pp. 506–510, 2023.

K Arif, KVP Kumar, R. K. Barik, G. Chakravarthi, “A planar quad-band bandpass filter employing transmission lines loaded with Tri-stepped impedance open-and dual-stepped impedance short-ended resonators,” Progress in Electromagnetics Research C, vol. 147, pp. 65–72, 2024.

Chandu Ds, KBS Sri Nagini, R. K. Barik, S. Koziel, “Compact substrate-integrated hexagonal cavity-backed self-hexaplexing antenna for sub-6 GHz applications,” Sensors, vol. 24, no. 6, pp. 1840, 2024.

V Jayaprakash, DS Chandu, R. K. Barik, S. Koziel, “Compact substrate-integrated hexagonal cavity-backed self-hexaplexing antenna for sub-6 GHz applications,” IEEE Access, vol. 12, pp. 54397 - 54404, 2024.

R. K. Barik and S. Koziel, “Microfluidically frequency-reconfigurable self-quadruplexing antenna based on substrate integrated square-cavity,” AEU - International Journal of Electronics and Communications, vol. 175, p. 155 082, 2024.

R. K. Barik and S. Koziel, “Microfluidically frequency-reconfigurable compact self-quadruplexing tunable antenna with high isolation based on substrate integrated waveguide,” Nature Scientific Reports, vol. 14, no. 1, p. 920, Jan. 2024.

R. K. Barik and S. Koziel, “Ultra-compact self-quadruplexing microfluidically frequency reconfigurable slot antenna using half-mode SIW,” AEU - International Journal of Electronics and Communications, p. 155 343, 2024.

R. K. Barik, X. Wu, X. Liu, and S. Koziel, “An Extremely Compact Frequency Reconfigurable Self-Diplexing Antenna Employing Dielectric Liquids,” IEEE Antennas and Wireless Propagation Letters, vol. 23, no. 11, pp. 3749–3753, Jul. 2024.

R. K. Barik and S. Koziel, “Ultra-miniaturized HMSIW cavity-backed reconfigurable antenna diplexer employing dielectric fluids with wide frequency tuning range,” Nature Scientific Reports, vol. 14, no. 1, p. 27767, Oct. 2024.

R. K. Barik and S. Koziel, “Highly-miniaturized microfluidically-based frequency reconfigurable antenna diplexer employing half-mode SIRW,” AEU - International Journal of Electronics and Communications, vol. 187, p. 155534, 2024.