Very Low-Profile and High Aperture Efficiency Fabry-Perot Cavity Antenna

We propose a very low-profile and high aperture efficiency Fabry-Perot cavity antenna. To achieve these characteristics, we block the lateral openings by using four metallic side walls to block leakage. And by designing the PRS properly, we control the resonance mode inside the Fabry-Perot (FP) cavity. Consequently, by forming the lowest-order mode rather than higher-order modes in the proposed antenna, we can avoid radiation performance degradation and obtain a directional beam. Moreover, the proposed antenna can provide high gain and very high aperture efficiency of 77.7 % at a very low antenna profile of only 0.19 $\lambda$.