A metallic Febry-Perot cavity antenna with slot-type FSS and hybrid lateral boundaries for high aperture efficiency

A metallic Febry-Perot cavity antenna (FPCA) with high aperture efficiency is present. The partially reflective cover of the proposed FPCA is realized by cross-dipole-slot type metallic frequency selective surface (FSS). With the combination of hybrid lateral boundaries, high aperture efficiency is achieved. The configurations of the lateral boundaries are that two short side walls are set to be perpendicular to the cavity horizontal field, while two open side walls are set to be parallel to the operating horizontal mode. The final field in the horizontal plane is uniformly distributed and therefore high aperture efficiency is realized. A prototype with overall aperture dimension of 2.86λ× 2.86λ is designed, and the maximum realized directivity is 19.96dB at 14.27GHz, which corresponds to 96.4% aperture efficiency.