Conference Papers
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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 Zero-Index Based Metasurface Antenna with Improved Gain and Circular Polarization Characteristics(Institute of Electrical and Electronics Engineers Inc., 2021) Tharehalli Rajanna, T.R.; Rudramuni, R.; Kandasamy, K.A zero-index based metasurface (MTS) is used to increase the gain of a circularly polarized (CP) patch antenna. The patch antenna is truncated at its corner to obtain the CP wave. The patch antenna gain in increased by loading the metasurface. The proposed CP antenna with enhanced gain is fabricated and verified experimentally. A measured impedance bandwidth (< -10dB) of 530 MHz and axial ratio bandwidth (< 3dB) of 100 MHz is achieved. The peak gain of 12.15 dBiC is obtained at the center frequency of 7.47 GHz with a better level of cross-polarization. © 2021 IEEE.