Design of Energy Selective Surface with Ultra-Wideband Protection

In this paper, an ultra-wideband energy selective surface (ESS) is proposed and simulated to protect electronic devices from high power microwaves (HPM). The ESS consists of two bandpass metasurfaces cascaded with an active metasurface. The performance of this structure has been studied using equivalent circuit models and full-wave simulations. The results show that the operating center frequency at 5 GHz with insertion loss of 0.4 dB, the insertion loss (IL) is less than 1 dB in the range from 4.77 GHz to 5.78 GHz, during the range from 1 GHz to 9 GHz, the shielding efficiency (SE) of HPM exceed 20 dB, and the relative bandwidth reaches 160%. At the same time, the structure has a certain degree of polarization insensitivity and superior angular stability.