Faculty Publications
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Publications by NITK Faculty
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Item Compact bandpass filter based on hybrid spoof surface plasmon and substrate integrated waveguide transmission line(Institute of Electrical and Electronics Engineers Inc., 2017) Rudramuni, K.; Kandasamy, K.; Kandwal, A.; Zhang, Q.In this paper, spoof surface plasmon polariton (SSPPs) and substrate integrated waveguide (SIW) based bandpass filter is proposed. The metal strip on the top of the substrate is composed of periodic slots which supports surface wave mode of SPP within the closed substrate integrated waveguide. The dispersion relation of the proposed structure shows that it has both low-pass feature of SSP and the high-pass feature of SIW, and hence the combination of these two features leads to a bandpass filter (BPF). The results show that the passband is from 11.5-19 GHz with relative bandwidth of 49%. Bandwidth can be controlled by properly adjusting the parameters of the design. The proposed design features a compact size and easy fabrication, due to the integration of SPP in a closed SIW. © 2017 IEEE.Item SRR loaded slot antenna for multiband applications(Institute of Electrical and Electronics Engineers Inc., 2017) Paul, P.M.; Kandasamy, K.; Sharawi, M.S.A compact square shaped microstrip triband slot antenna is proposed. Two Split Ring Resonators (SRR) of the same configuration are loaded at one edge of the slot in a back to back orientation. The other edge of the slot is displaced with two 180° rotated SRR's with multiple slits. The additional bands are obtained from the resonance properties of the loaded SRR's. The antenna is simulated and measured. The resonance frequencies obtained are 2.7 GHz, 4.3 GHz and 4.7 GHz. A minimum bandwidth of 130 MHz is achieved. © 2017 IEEE.Item A Multi-Band SRR and Strip Loaded Slot Antenna(Institute of Electrical and Electronics Engineers Inc., 2018) Paul, P.M.; Kandasamy, K.; Sharawi, M.S.In this paper, a novel compact slot antenna suitable for penta-band applications is proposed. The different resonances are obtained by loading the slot on the top layer with an array of copper strips of equal length and with a Split Ring Resonator (SRR) at the bottom layer. The antenna prototype is fabricated and measured. The simulated and measured results are in good agreement. The antenna is found to resonate at frequencies of 1.51 GHz, 2.35 GHz, 2.9 GHz, 3.66 GHz and 5.6 GHz. Also, a gain higher that 2.4 dBi and a bandwidth of at least 80MHz are obtained for all the bands. © 2018 IEEE.Item A novel beam steering dipole antenna using phase varying metasurface as reflector(Institute of Electrical and Electronics Engineers Inc., 2018) Majumder, B.; Mukherjee, J.; Kandasamy, K.; Ray, K.P.In this paper a simulation based study of a novel continuously beam steerable antenna is presented using a tunable metasurface as phase varying reflector. The antenna radiation pattern can be changed by changing the state of the diodes loaded in the phase varying reflector. A planar dipole antenna is used to excite the tunable reflector. By this technique the antenna beam can be steered from +300 to -300 in the broadside direction depending on the operating state of the diodes. Moreover, the state of the diodes can be addressed digitally and hence a steep gradient in phase can be achieved in the reflector. The antenna radiation pattern and the gain has been found stable all over its states. © 2017 IEEE.Item Quad band SRR loaded square slot antenna(Institute of Electrical and Electronics Engineers Inc., 2018) Paul, P.M.; Kandasamy, K.; Sharawi, M.This paper proposes a Split Ring Resonator (SRR) loaded quad band microstrip slot antenna designed to operate at 2.42 GHz, 4.33 GHz, 8.46 GHz and 10.9 GHz. The additional resonant bands are generated by loading the square slot antenna with two pairs of SRR structures on either side of the feed line. The bands centered at 8.46 GHz and 10.9 GHz are found to exhibit wideband and circular polarization properties respectively. The resonance band at 8.46 GHz provides a wide bandwidth of 2.43 GHz. One pair of the loaded SRR structure consists of two spiral shaped connected SRR's. The excitation of these structures gives rise to a circularly polarized band at 10.9 GHz with 3-dB axial ratio bandwidth of 390 MHz. Maximum gains of 3.82 dB, 3.95 dB, 7.5 dB and 4.2 dB are obtained at the four resonant frequencies, respectively. A minimum bandwidth of 270MHz is observed for all the bands of operation. © 2017 IEEE.Item Dual Band-Dual Sense Circularly Polarized Patch Antenna for Wi-Max Application(Institute of Electrical and Electronics Engineers Inc., 2018) Bande, V.; Tharehalli Rajanna, T.R.; Kandasamy, K.A rectangular slotted patch antenna with circular rings as parasitic element for accomplishing dual-band dual-sense circular polarization (CP) for wireless application is presented in this paper. The proposed antenna is of compact size having dimension of 31x21x1.575mm3. The dual band is achieved by square patch with multiple slots along with Circular ring like structure on backside. The given antenna consist of two resonating frequency band 4.25 GHz and 5 GHz , while considering return loss as S11<-10dB and the 3-dB axial ratio (AR) bandwidth of 1.8% (from 4.18 to 4.257 GHz) and 2.8% (from 4.94 to 5.08 GHz) in lower and upper bands, respectively. The proposed antenna is fabricated and tested experimentally. The measured and simulation results are in agreement. © 2018 IEEE.Item Dual Band Circularly Polarized Slot Antenna Loaded with Asymmetric Cross Strips(Institute of Electrical and Electronics Engineers Inc., 2018) Tharehalli Rajanna, T.R.; Rudramuni, R.; Kandasamy, K.In this paper, a dual band circularly polarized (CP) slot antenna loaded with asymmetric cross strips is proposed. It consists of a corner perturbed slot and two asymmetric strips oriented diagonally with the slot. The slot antenna is excited by 50\Omega microstrip line. The proposed antenna resonates at 2.7 GHz and 3.2 GHz. Two orthogonal degenerate modes produced by the perturbed slot antenna gives CP in lower band and the combination of slot and strip mode gives CP in upper band. The proposed antenna is fabricated and experimentally verified with axial ratio (AR) bandwidth of 13.27% and 13.31% in lower and upper band respectively. The peak gain of 4.68 dB at lower band and 4.81 dB at upper band is achieved. The simulated and measured results are in well agreement and it is good candidate for WiMax and WLAN applications. © 2018 IEEE.Item A Tri-Band SRR Loaded Half Slot Antenna with Wideband Properties(Institute of Electrical and Electronics Engineers Inc., 2018) Paul, P.M.; Kandasamy, K.; Sharawi, M.S.In this paper, a compact tri-band split ring resonator (SRR) loaded slot antenna is proposed which offers independent frequency tunability for operation at WLAN and WiMAX bands. The microstrip fed slot antenna is loaded with a modified SRR to obtain the triband resonance. The compactness is achieved by using an open slot antenna. The slot is designed to resonate at 2.4 GHz, which combines with the resonance obtained due to a fictitious short circuit produced at a certain point along the slot. This leads to the wideband property at the first band. The second and third resonances are obtained at 7.5 GHz and 9.3 GHz. The resonances can be independently controlled by changing the slot and SRR dimensions. © 2018 Radio Society.Item Design of quatrefoil shape antennas for GSM1800 MHz and UMTS2.1 GHz rectenna applications(Institute of Electrical and Electronics Engineers Inc., 2019) Polaiah, G.; Kandasamy, K.; Kulkarni, M.In this paper Quatrefoil shape CPW-Fed monopole antenna and slot antenna operating at GSM1800 MHz and UMTS2.1 GHz cellular bands are proposed. Simulated results show that the radiation efficiency of CPW fed monopole antenna and slot antenna at GSM1800 MHz and UMTS2.1 GHz are 93% and 81% respectively. Similarly the realized gains of monopole antenna and slot antenna operating at GSM1800 MHz and UMTS 2.1 GHz are 2.49 dB and 2.2 dB respectively. © 2019 URSI. All rights reserved.Item A Corner Expanded CPW-Fed Slot Antenna with Circular Polarization Characteristics(Institute of Electrical and Electronics Engineers Inc., 2019) Paul, P.M.; Kandasamy, K.; Sharawi, M.S.A planar, slot-based, simple and circularly polarized (CP) antenna is presented in this work. It consists of a square shaped slot that is fed via a coplanar waveguide (CPW) 50-ohm feed. The CP slot operates at a center frequency of 2.5GHz. Here, the corners are modified by adding small symmetric rectangular slot extensions to produce CP based waves. The plots obtained on simulation and measurement of the fabricated prototype display commendable similarity between each other. Very wide axial ratio bandwidth (ARBW) of 35% along with a maximum gain of 3.5dBi at 2.5GHz were accomplished. © 2019 European Association on Antennas and Propagation.