Wideband high-gain low-profile 1D Fabry-Perot resonator antenna

Wideband high-gain low-profile Fabry-Perot resonator antennas (FPRAs), composed of a single superstrate and a PEC ground, are proposed in this paper. Two thin dielectric slabs are used to construct the superstrate that exhibits increasing reflection phase at the designated frequency band, making the Fabry-Perot cavity resonate at a wider band and hence leading to a wideband low-profile FPRA. The design example validates the design principle. By truncating the size of the superstrate to about 1.3λ×1.3l, the 3dB-gain directivity bandwidth of the antenna can be extended from 12.6% to 34.8%, with a peak gain of 15.7 dBi.