Wideband High Gain and Low RCS Fabry–Perot Antenna Using the Single Layer Partially Reflective Surface

ABSTRACT This letter presents a novel wideband high gain and low radar cross section reduction (RCS) Fabry–Perot (FP) antenna using a single layer partially reflective surface (PRS). Different from the traditional PRS unit, the proposed PRS unit can broaden the gain bandwidth and reduce the in‐band RCS. The designed PRS distributes the radiated waves in‐phase through the positive phase gradient compensation and weakens the reflection of the incident waves through the phase cancellation. Compared to the previous wideband low RCS FP antennas, we first achieved the 3 dB gain bandwidth covering the 10 dB impedance bandwidth. Both the simulation and measured results verify the performance of the proposed FP antenna. The results show that the proposed FP antenna has a 10 dB impedance bandwidth of 8.6–11.8 GHz (31.4%) and an RCS reduction bandwidth of 7.9–14.0 GHz (55.7%) under the normal incidence. The 3 dB gain bandwidth and the maximum realized gain are 8.3–12.0 GHz (36.5%) and 16.3 dBi.