Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Subject: search.filters.subject.Circular Polarization

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    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.
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    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.
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    Dual-Functional Reflective-Metastructure Array for Polarization Conversion and Stealth Application
    (Institute of Electrical and Electronics Engineers Inc., 2024) Madhusudhan Goud, R.; Paul, P.; Kandasamy, K.; Majumder, B.
    This work proposes a compact, single-layered dualfunctional reflective meta-structure array to convert incident X/Ypolarized EM waves to cross-polarized waves in a portion of Kaband spectrum and to obtain circularly polarized (CP) waves with broadband characteristics in the Ku and K band frequency spectrum. The unit cell comprises of a symmetrical I-shaped metallic resonator with a single rectangular split ring resonator at the centre. The rotation of the induced surface currents on the meta-structure and the phase profile of the reflected waves confirms the presence of left-handed CP waves. When rotated in XY plane around Z-axis by 90°, this meta-atom reflects cross polarized waves with 180° phase difference compared to the original meta-atom across the entire operational bandwidth. This phase profile is utilized to realize a checkerboard metasurface and it is observed that significant RCS reduction is achieved in the cross-polarization conversion band. The overall size of the optimized unit cell is 0.26 × 0.26 × 0.07 λo3 mm3 and reflects CP waves with an axial ratio (AR) less than 3 dB from 15.3 GHz to 26.03 GHz. At the same time, cross-polarization conversion is observed from 28.33 GHz to 35.4 GHz, which makes the design best suitable for future wireless communication and RCS reduction application simultaneously. © 2024 IEEE.