Microstrip antenna array with periodic filters

摘要

An antenna unit (50) formed in the shape of a hollow box comprises a substrate forming the front side of the antenna unit, a microstrip antenna array (51) formed on the substrate, a ground plane forming the rear side of the antenna unit, and a plurality of periodic filters (53) formed on the ground plane. The periodic filters are formed by etching a series of circular patterns, or holes, through the ground plane.