A high gain planar antenna with improved bandwidth using a Fabry-Pérot resonator

A high gain Fabry-Pérot cavity antenna with broadband performance is presented. A thinned 2×2 array of microstrip patch antennas is used to feed the cavity which is formed by a metal ground plane and a partially reflective surface (PRS). The bandwidth enhancement is achieved by the use of an optimized PRS structure. Two different PRS are examined, both consisting of periodic metallo-dielectric arrays printed on a double layer and a novel single layer setup, respectively. Prototype antennas have been fabricated and measured obtaining a relative bandwidth of 3.4% and 4.4%, respectively.