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Author: search.filters.author.Singhal, RahulSubject: search.filters.subject.Hexagonal Patch Antenna

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    Probe-fed regular hexagonal narrow-slot antenna with reduced ground plane for WLAN applications
    (IEEE, 2016) Singhal, Rahul
    The effect of hexagonal slot in probe-fed hexagonal shaped patch antenna with reduced ground plane is proposed, analyzed and studied. In this paper, experimental and simulation results for a probe-fed proposed antenna required for impedance characterization are presented and compared. The hexagonal slot in hexagonal antenna improves the gain of the antenna compared to antenna without slot. With a thickness of 0.027 times the free space wavelength (λ 0 ), the hexagonal shaped patch antenna with hexagonal slot and reduced ground plane can achieve a bandwidth of around 400 MHz in C-band centered at 5.5 GHz. The fabricated hexagonal shaped patch antenna with hexagonal slot can be utilized for requirements of WLAN applications.
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    Effect of reduced ground plane in a vertex-fed hexagonal C-band antenna
    (IEEE, 2017) Singhal, Rahul
    Vertex-fed hexagonal planar antennas excite higher order modes. Monopole like radiation characteristics may be achieved through ground plane reduction. The paper presents the effect of reduced ground plane (RGP) which may be used as a technique to excite a higher-order mode and suppress spurious frequency radiation, if any, due to probe feeding. The designed antenna structure has a hexagonal slot at the centre of a hexagonal patch fed through a probe at a vertex of the hexagon. To understand the effect of RGP on antenna performance, an equivalent circuit model is analyzed and discussed. A study on surface current distribution over patch surface confirms radiation of TM 12 mode. The proposed C-band antenna exhibits a gain of 3.84 dB at 5 GHz and a bandwidth of around 600 MHz that makes it suitable for indoor WLAN applications.
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    Excitation Amplitude/Phase Sensitivity in Circularly Polarized Hexagonal S-Band Antenna
    (IEEE, 2019) Singhal, Rahul
    A probe-fed circularly polarized hexagonal patch antenna with dual feed configuration is designed and presented for analyzing amplitude and phase sensitivity. The hexagonal patch antenna is excited with a fundamental frequency of 2.45 GHz through two feeds separated by an angle of 90° and 90° phase shift. The probe feed positions are optimized along the X- and the Y-direction of the patch antenna plane with and without simultaneous excitation. The sensitivity of circular polarization purity towards change in amplitude and phase of excitation signal is studied for a dual port hexagonal S-Band antenna.
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    Vertex-Fed Hexagonal Antenna with Low Cross-Polarization Levels
    (AEEE, 2019-06) Singhal, Rahul
    Probe-fed hexagonal patch antenna suffers from impedance mismatch especially when feed is located at one of the vertices of polygon. Hexagonal planar antennas also suffer from high cross polar levels. This paper proposes a method to overcome impedance mismatch and to increase co-polarization level by reducing ground plane. Vertex feeding is demonstrated in this paper to establish improvement in impedance values more clearly. The impedance at any vertex of a hexagonal patch is too high when compared to the characteristic impedance of the probe. Three vertex-fed hexagonal antennas are developed to demonstrate the effect of ground plane reduction within C-Band. The proposed technique can be optimized to match the impedance and achieve good return loss where monopole radiation characteristics are not an issue. A vertex-fed reduced ground hexagonal antenna is proposed here that operates around 5 GHz with a frequency span of 600 MHz. Thus, the proposed antenna is quite suitable for indoor wireless LAN (UNII-1) applications.
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    Coaxially Fed Hexagonal Patch Antenna for C- and X-Band Applications with Reduced-Ground Plane
    (ECTI Association, 2019-08) Singhal, Rahul
    The consequence of reduced ground plane in a coaxially-fed hexagonal antenna, on impedance and radiation is analyzed and presented here. Measured and simulated impedance results for a designed antenna are compared with the equivalent circuit model in this paper. The reduction in ground plane excited frequencies in upper C-band and lower X-band. The designed hexagonal antenna uses a substrate with a dimension of 32×33.5 mm2 along with a reduced ground plane of area, 10.44×24.44 mm2. The proposed antenna has a 285 MHz and 380 MHz impedance bandwidth in C-band and X-band respectively. The designed antenna with reduced ground plane works well for C-band and X-band applications.