Design of a dual-feed orthogonal polarized patch antenna array

A dual-feed orthogonal polarized patch array with high polarized isolation has been designed in this paper. A very foundational rectangular patch is adopted to be array elements which provide desirable isolation between two feeding ports for orthogonal polarizations, and desirable axis ratio for circular-polarized array. The feed network is designed as a planar structure which can be extended to construct the larger array conveniently. Two 4 × 4 arrays are designed and fabricated to investigate the isolation performance between two feeding ports for orthogonal polarizations and the axis ratio performance for circular-polarized arrays. Simulated and measured results show that desirable performance of isolation below -40 dB and bandwidth of axis ratio less than 3 dB of 6% can be achieved.