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Design of a dual‐polarized microstrip patch antenna with excellent polarization purity

In this paper, the design of a broadband dual‐polarized microstrip patch antenna with excellent polarization purity is investigated theoretically and experimentally. Based on cavity‐model theoretical analysis, a test dual‐polarized microstrip patch antenna fed by double slot‐coupled feeds with a 180° phase shift and a coplanar microstrip feed is presented. The simulated and measured results show that this antenna achieves a high isolation (< −41 dB) across the entire operating frequency and low cross‐polarization level (< −30 dB). © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 329–331, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20625