A Dual-passbands FSS with Wide Angular Stability and High Polarization Stability for 5G and EMC Pulse Shielding

An excellent frequency selective surface (FSS) with capacitance loading and multi-layer structure is proposed, primarily for application in the sub-6 and shielding. The proposed FSS has two different operational passbands to cover the frequencies located at 3.68 GHz and 5.85 GHz, respectively, which is also a multi-layered unit consisting of three metal layers and two dielectric layers. The unit size is 0.125λ, and the unit profile is 0.075λ, where λ corresponds to the resonance frequency of the first operating band. By adjusting the structural dimensions and parameters, the operating bands can be well-tuned. Simulation results demonstrate favorable polarization stability and angular stability, making it good for pulse shielding.