A high-gain wide-band Fabry-Perot cavity (FPC) antenna is presented for C-band point-to-point communication systems. The proposed antenna utilizes a broadband aperture-coupled microstrip antenna (ACMA) as the source and multilayer frequency-selective surfaces (FSSs) as the superstrate. The experimental result shows that the proposed antenna achieves an impedance band from 4 to 5.4 GHz (30%) for ${rm S}_{{rm 11}}{rm leq-10}$ dB. The wide band is obtained through the merging of different resonance frequencies due to the patch, the coupling aperture, and the superstrate layer. The antenna also facilitates an enhanced broadside gain up to 14.2 dBi at 4.8 GHz with variations of less than 4 dB throughout the operating band by loading three layers of FSS superstrate. Furthermore, a parametric study is performed to provide antenna engineers with information about the design.
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