Microstrip antenna of two frequency separate-feeding type for circularly polarized waves

摘要

A microstrip antenna of two-frequency separate-feeding type for circularly polarized waves, in which four radiation conductors (111 to 114) are disposed on a dielectric plate (15) mounted on a conducting ground plane (14) and each radiation conductor has its marginal portion partly short-circuited via a short-circuiting conductor (121 to 124) to the conducting ground plane and is supplied at its feeding point with power via a feeder (161) passing through the conducting ground plane and the dielectric plate. The four radiation conductors are composed of two pairs of radiation conductors of different sizes adjusted so that two desired frequencies can simultaneously be used for transmission and for reception, respectively, the conductors of each pair being arranged to generate a circularly polarized wave.