Miniaturised Bandstop Frequency Selective Surface Based on Multilayer 2.5-Dimensional Structure

A hexagonal miniaturized frequency selective surface (FSS) based on multilayer 2.5-dimensional (2.5D) closed loop is proposed in this paper. The finite element analysis software Ansoft HFSS 19 is used to simulate the performance of FSS under different polarization modes and incident angles of electromagnetic wave. The simulation results show that the FSS resonates at 2.36 GHz and the corresponding unit size is 0.041λ0 × 0.041 λ0. It also shows an outstanding stability under different polarization modes and incident angles.