Dual-polarized dual-band angle-selective surface based on double-layer FSS

Abstract

This Letter presents a dual-polarized, dual-band angle-selective surface structure based on a double-layer frequency selective surface (FSS), composed of two identical slotted FSS layers. Both FSS layers consist of a metal layer and a dielectric substrate, and they are separated by an air gap. The proposed structure enables distinct angle-selective transmission at two frequency bands while maintaining polarization insensitivity for both TE and TM modes. Specifically, at 8.5 GHz, electromagnetic waves incident within the angular range of 0°–9° exhibit excellent transmission performance (S21 > −1 dB), whereas at 9.6 GHz, the transmission angle is confined to angles between 30° and 31°. Furthermore, the unit cell size and overall thickness of the structure remain relatively compact. To provide theoretical insight, an equivalent circuit model is employed for analysis, and a prototype is fabricated for experimental validation. The measured results demonstrate strong agreement with the simulated results, confirming the effectiveness of the proposed design. When the target signal and the interference signal reside within the same frequency band, the proposed structure efficiently mitigates electromagnetic interference.