Circularly polarized Fabry–Perot antenna with well RCS reduction property

A circularly polarized (CP) Fabry–Perot (FP) resonator antenna with well radar cross section (RCS) reduction property is presented in this article. Wideband and well in-band RCS reduction for both x- and y-polarized waves are obtained by the proposed antenna. A polarization conversion metasurface (PCM) is designed to make the antenna realize circularly polarized radiation and RCS reduction simultaneously. The PCM consists of two unit cells which show same polarization conversion capability but 180° reflection phases difference when the wave incident from the top side. The polarization conversion capability can make the antenna realize circularly polarized radiation, while the chessboard arrangement of two unit cells can reduce the RCS of the antenna. Besides, the high reflectivity of the PCM also make the antenna obtain high gain and well in-band RCS reduction property. The radiation and scattering performance of the antenna is verified by the measured results of the fabricated antenna. The antenna obtains maximum gain of 13.9 dBic at 10 GHz and average RCS reduction of 10 dB in the band of 6–16 GHz. Besides, the RCS reduction of the antenna at 10 GHz for both polarizations are all large than 14 dB.