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Wideband Circularly Polarized Fabry−Pérot Cavity Antenna With Sparse Array

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Abstract

A Planar wideband, circularly polarized (CP) Fabry-Pérot cavity (FPC) antenna with a wideband CP excitation source is presented in this paper. The antenna is constructed made of from a finite size partially reflective surface (PRS) that because of its thickness exhibits a non-Foster response which results in wide gain bandwidth. Wideband patch antennas with sparse array located at the ground of an air-filled cavity is used to excite the cavity with a CP wave. The Thesis summarizes the final results of an investigation that lasted several months, where various feeding geometries generating CP were considered. Here, we report only the design that led to the best results during the investigation. Simulation results of the proposed FPC antenna indicate that such an antenna radiates a CP wave with high FBR where high antenna gain is achieved over wide relative impedance bandwidth of 13.7% around 22 GHz. The antenna radiates with a maximum gain of 17.5 dBic and -3 dB gain bandwidth of 10.4% with an axial ratio (AR) bandwidth of 7.9%.

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