Abstract
For obtaining dual-polarization, using a square annular cavity in the ground plane of a broadband microstrip patch antenna, with proximity-coupling as the feeding mechanism, is proposed in this paper. The antenna has four sequentially arranged feed-lines, and each pair of opposite feed-lines in the same direction are excited by antiphase, which provides the high isolation between the two pairs of ports, besides increasing polarization purity. The cavity and the patch act as two radiators, and the square annular shape of the cavity improves their balance, and thus the bandwidth. The design of the antenna, which is based on particle swarm optimization (PSO) algorithm, and the main parameters of the antenna were investigated. To validate the proposed method, a prototype antenna and a feeding balun were fabricated. The measured results show 61% bandwidth (active $\text{VSWR} ), high isolation and good radiation patterns.
Published Version
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