Based on the theory of Babinet's principle, a type of dual-polarized antenna working in C band with complementary structures is designed. The structures comprise a wire loop antenna and a slot loop antenna, which is complemented and fed by a coaxial line. A ground is placed to improve the front-to-back ratio of the antenna. The performance of the antenna is studied numerically and experimentally. A prototype antenna was built, stable and symmetric radiation patterns are obtained within the frequency of 4.9 GHz~5.1 GHz, and the port isolation is less than -24dB. The measured results coincide with the simulated ones. This explains the feasibility of the proposed dual-polarized antenna.
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