Abstract
This paper investigates the application of frequency- selective surface (FSS) in re∞ectarray antennas for the purpose of reducing radar cross section (RCS) level. Difierent from previous reports, the presented band-stop FSS structure is also characterized by the suppression of surface waves, which makes a contribution to better radiation performance. Two 14£14 re∞ectarray antennas backed on the FSS ground and a solid ground are designed and fabricated. Simulated and measured results show that the FSS ground can improve the 'in- band' gain by 1.1dB, decrease the sidelobe level by 6.4dB, and reduce the 'out-of-band' RCS efiectively when compared with the antenna with a solid ground plane of the same size.
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