Design of ultra-wideband energy selective surface for protection of high intensity EM fields

In order to deal with the threat of strong electromagnetic pulses to electronic information systems, an ultra-wideband strong ESS (energy selection surface) with transceiver compatibility was designed, which can effectively expand the operating bandwidth and frequency of the ESS, and can provide no less than 14 dB protection effect in L、S、C-band. The ESS was a periodic structure, with each unit containing a pair of arrow shaped structures and a switching diode. It can adaptively switch the reflection or transmission state according to the energy density of external irradiated electromagnetic waves, thereby achieving strong electromagnetic protection and compatibility with working signal transmission and reception. Simulation research shows that the insertion loss of this new ESS in the L、S、C band is less than 1 dB, and its protection effectiveness reaches 22 dB. Finally, the performance of the designed sample was verified in the waveguide. Results show that the average insertion loss of the sample in the waveguide is 1 dB, and the protection effectiveness reaches 14 dB, which preliminarily verifies the low insertion loss and high protection effectiveness of the designed structure.