Antenna using an electromagnetic band gap reflector

摘要

An antenna unit (20A) consists of an EBG reflector (12), a single curl antenna (21) supported at a central portion of the EBG reflector, and a periodic structure upper plate (30) disposed apart from a principal surface of the EBG reflector by a predetermined distance (H). The EBG reflector (12) includes a substrate (122) having the principal surface and (Nx x Ny) square patches (124) which are printed on the principle surface of the substrate and which are arranged in a matrix fashion (lattice structure). The periodic structure upper plate (30) consists of a film (32) and (Nx x Ny) square patch-like conductors (34) printed on the film. The (Nx x Ny) square patch-like conductors (34) are disposed so as to oppose to the (Nx x Ny) square patches (124), respectively.