Abstract
A novel hybrid reflection method is proposed to realize wideband gain enhancement and radar cross section (RCS) reduction properties for Fabry–Perot (FP) antennas. This method adopts two kinds of frequency-selective surface (FSS) units, which are etched on both sides of a single-layer substrate with chessboard arrangement to operate separately as a hybrid surface (HS) and a reflective surface (RS), to form a hybrid partially reflecting surface (HPRS). The two FSSs with different positive reflection phase gradient bands and reflection amplitudes collaborate to expand the 3 dB gain bandwidth and improve the gain enhancement on the RS. Meanwhile, the different compensation phases of the two FSSs can redirect reflected waves to reduce the RCS on the HS, and phase cancellation is applied between the retransmitted waves and reflected waves to further reduce the RCS. The simulated and measured results verify the correctness of the proposed method. The prototyped FP antenna has a measured 10 dB impedance bandwidth of 8.64–12.07 GHz (33.1%), a 3 dB gain bandwidth of 8.6–11.1 GHz (25.4%) with a peak gain of 17.08 dBi at 9.5 GHz, and an RCS reduction bandwidth of 8.6–14 GHz with a peak RCS reduction of 19.5 dB.
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