C-band dual-polarized stacked-patch antenna with low cross-polarization and high isolation

Abstract

A hybrid-fed dual-polarized stacked patch element with low cross-polarization and high port isolation is introduced. The proposed antenna element achieves a 10dB return loss bandwidth of 840MHz (about 15%) in C band. The crosspolarization of antenna keeps under −37dB in both orthogonal ports with the isolation remains less than −42dB in the whole bandwidth. The front-back ratio of radiation pattern keeps more than 22dB while its gain is stable at 9dB in the whole bandwidth. Moreover, an obvious merit is that the proposed antenna has a compact structure, thus makes it easy to be extended to form a large array, which can be applied in phased radars and Synthetic Aperture Radar (SARs).