Non-resonant multilayer cascading of frequency selective surface

To reduce the scattering of the airborne antenna working in the L band to the wave which is higher than its working frequency range, a multi-layer cascade structure array composed of non resonant elements is designed. Based on the cross grid inductance layer, it effectively prolongs the current path through the form of spiral curved line and increases the inductive effect of the inductance layer. The line helix can control the size of the unit and suppress the appearance of the high order mode and the gate flap. By modifying the capacitance layer metal pattern, the patch unit is transformed into a resonant square ring unit, and the transmission pole of the banded square ring element is placed at the array interference point, which can effectively suppress the narrow transmission peak caused by the array interference. In order to reduce the influence of the high frequency electromagnetic scattering, the influence of the electromagnetic scattering on the radar cross section of the aircraft is reduced, and the selection of the surface frequency is realized. The simulation of the physical and equivalent circuit models of the above design is carried out by the high frequency electromagnetic simulation software, and the size of the structure is optimized. The design samples are tested and analyzed, and the results show that the above design can achieve the purpose of frequency selection.