A Novel Design of Dual-Band Energy Selective Surfaces Using Characteristic Modes Analysis

A novel dual-band energy selective surfaces (ESS) is proposed with the aid of the theory of characteristic mode in this paper. The structure of the ESS is composed of a trimmed Jerusalem cross patch, printed on FR-4 substrate. The PIN diodes loaded on the surface are determined according to the characteristic current, and the nonlinear transmission of the incident wave is adaptively controlled by the PIN diodes. The full-wave simulation results show that when the PIN diodes are turned on, the ESS can maintain the transmission coefficient below $\mathbf{- 1 0} \mathbf{~ d B}$ within the frequency band of 4.2 $\mathrm{GHz} \sim 5.0 \mathrm{GHz}$ and $10.4 \mathrm{GHz} \sim 11.7 \mathrm{GHz}$, with a minimum of -23.6 dB. While the insertion loss at the resonant point is less than -1 dB, as the PIN diodes are turned off. Finally, it is verified that the designed ESS can realize the adaptive shielding of dual-band incident waves by field-circuit co-simulation.