A novel Wideband Frequency-Selective Polarization Converter for Reducing Backward-Scattering

In this paper, we combine the frequency selective surface (FSS) with the polarization conversion surface to realize the frequency selective polarization converter (FSPC), which can be used to reduce the backward radar cross section. The proposed FSPC consists of a curved double-arrow reflection polarization conversion layer in the upper layer and a chamfer FSS layer in the lower layer. The results show that the transparent frequency band of 3-dB ranges from 8.9 to 14 GHz, and the relative bandwidth of the co-polarizing reflection coefficient less than-10dB is 135%. The reflection polarization conversion rate of the designed FSPC is over 90% in the frequency bands of 4-7.9 GHz and 16.3-20 GHz on both sides of the passband. Furthermore, the designed FSPC is arranged on a chessboard pattern to reduce backscattering energy in the broadband range from 3.5 to 23 GHz. Compared with traditional polarization converters, the designed FSPC exhibits an extra frequency selection performance of a broadband transmission window. These results will have potential applications in radomes to achieve wideband low backward RCS.