Array-based Fabry-Perot cavity antenna for flat-topped radiation pattern

In this letter, an array-based ray tracing model and Fabry-Perot cavity antenna covered by frequency selective surfaces (FSS) are proposed to realize the flat-topped radiation pattern (FTRP). Based on the array-based model, a good FTRP can be obtained by combining the initial directivity of the feed array with the additional directivity of FSS-type partially reflective surface. By using the proposed method, a low-cost, lightweight, simple structure and dual-polarization Fabry-Perot cavity antenna with small aperture size for FTRP is designed. From the measured results, the FTRP with more than 58 degrees beamwidth and less than 2 dB ripple level in the frequency band of 2.4 to 2.7 GHz for indoor communication are obtained.