A novel method for high‐gain and high‐aperture efficiency Fabry‐Perot resonator antenna design.

Due to the nonuniform electric field distribution over its aperture, the Fabry‐Perot resonator antenna (FPRA) is normally with high gain but relatively low‐aperture efficiency. In this paper, a novel nonuniform superstrate design method is proposed to improve the gain and aperture efficiency of the FPRA. The reflection amplitude design formula of the superstrate for uniform electric field distribution is derived. Based on this formula, a nonuniform superstrate with different reflection amplitudes and a fixed reflection phase is designed to uniformize the aperture electric field distribution and maximize the aperture efficiency of the FPRA. As a verification of this design method, a FPRA working at 10 GHz with the aperture size of 3.5 × 3.5 λ is designed, fabricated and measured. The simulated gain of the nonuniform FPRA is 21.6 dBi at 10 GHz with the aperture efficiency as high as 93.9%. [ABSTRACT FROM AUTHOR]