A Low-RCS Fabry-Perot Resonant Cavity Antenna with Reduced Profile

A low-profile Fabry-Perot (F-P) resonant cavity antenna with an enhanced gain and a reduced radar cross section (RCS) is presented. The antenna is composed of an artificial magnetic conductor (AMC)-partially reflective surface (PRS) superstrate, an AMC ground and a radiation patch. The PRS and AMC ground form a F-P cavity. Due to the zero-phase reflection of the AMC ground, the thickness of the cavity is reduced into quarter wavelength. In addition, such a thickness results in a phase difference of 180° between reflections of the PRS-backed AMC superstrate and the AMC ground, which makes the backward RCS of the antenna is reduced. Simulated results demonstrate the designed F-P antenna realize 4.6 dB gain promotion at 10 GHz and Radar Cross Section reduction cover 8 to 20 GHz in contrast to the primary patch antenna.