A Novel Adaptive Electromagnetic Cancellation Frequency Selective Surface

A novel adaptive electromagnetic cancellation FSS (Frequency Selective Surface) is presented. The FSS combines three types of structures that satisfy the principle of electromagnetic cancellation to cancel the incident wave and achieve wideband reflection reduction. To expand the bandwidth, a reconfigurable structure with PIN diodes is taken into account. The 11 × 11 adaptive electromagnetic cancellation FSS array was fabricated and measured. The results show that the frequency bands of reflection energy intensity lower than -10dB are 4.35-5.35 GHz and 3.7-4.65 GHz, respectively, when the PIN diodes are on or off. Liquid crystal can also be used to produce a reconfigurable structure in the FSS, and simulation results indicate that the cancellation band can be adjusted.