A Novel High-Performance FSS-AMC Radome Unit

In this paper, a novel high-performance frequency selective surface and artificial magnetic conductor (FSS-AMC) radome unit is investigated. Composed of a double-layer miniaturized bandpass FSS unit and a single-layer AMC unit, it can achieve high-efficiency wideband transmission and have a great potential application in wideband RCS reduction (RCSR). The bottom FSS structure can achieve a wide flat in-band frequency response and fast roll-offs with a simulated -1 dB passband ranging from 4.1 GHz to 5.4 GHz (relative bandwidth 27.4%). In addition, the double-layer FSS has a total reflection characteristic from 7 GHz to 18 GHz, which indicates that it can be used as the ground plane of the top AMC unit. Two types of AMC units possessing 0 and π reflection phase respectively are designed, which proves that the proposed FSS-AMC units can be used in antenna RCSR field once they were formed into a chessboard structure.