X-band frequency selective surface with low loss and angular stability

A bandpass frequency selective surface (FSS) with low loss and angular stability based on three metal layers is proposed in this paper. The top and bottom resonant layers are coupled through a metal ring layer to build the FSS structure. The equivalent circuit model is derived to explain the operation principle of the proposed FSS. In the design, two transmission zeros (TZs) are generated at both sides of the passband contributing to the high selectivity performance. Furthermore, current distributions are given to analyze the generation mechanism of the TZs. The performance of the proposed FSS is insensitive to the polarization and angle of the incident wave. To verify the performance, a prototype of the FSS is fabricated, whose measured results agree with the simulated ones. The FSS shows low-profile of about 0.07 lambda (lambda is the free space wavelength at the center frequency).

Automated summary

This paper proposes a bandpass frequency selective surface (FSS) with low loss and angular stability based on three metal layers. The FSS structure is built by coupling the top and bottom resonant layers through a metal ring layer. The performance of the FSS is insensitive to the polarization and angle of the incident wave, and the prototype measurements agree with the simulations.