Design of a Self-Complementary Frequency Selective Surface with Multi-Band Polarization Separation Characteristic

Abstract

According to the principle of Babinet, this paper designs a novel frequency selective surface (FSS) with high performance. Using the Babinet principle, an asymmetric Jerusalem cross patch structure and its complementary aperture structure are mixed on one side of the dielectric substrate, namely, self-complementary FSS (SCFSS). The theoretical analysis and experimental results show that SCFSS has excellent multi-bands polarization separation characteristics in different frequency ranges. In each passband, the insertion loss is less than 0.5 dB, and the out-of-band suppression level is relatively high. By individually adjusting the size of a certain structural parameter of SCFSS, the position of polarization separation frequency band can be adjusted in a specific frequency band range, thus meeting the requirements of the practical application. By rotating the surface, its filtering characteristics for polarized waves of a certain mode can be mechanically tuned from bandpass to bandstop. Furthermore, the SCFSS has an excellent incident angle stability in a wide range from 0° to 60°. Therefore, when designing polarization separation structure and polarization wave generator for the wireless communication system (such as the satellite communication system), the novel SCFSS structure proposed in this paper can provide an excellent reference.