Dual-polarized complementary structure antenna based on Babinet’s principle

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