An X-band surface plasmons frequency selective surface based on spoof localized surface plasmons resonators

In this paper, a novel microwave band-pass frequency selective surface based on the concept of spoof localized surface plasmons (S-LSPs) resonators is demonstrated, whose center frequency is 11.35 GHz with two null points located at 8.8 GHz and 11.75 GHz. The new frequency selective surface is organized by replacing the conventional frequency selective surface unit cells, using S-LSPs resonators which support multipolar resonance modes. The modes of S-LSPs resonators are controlled by taking advantage of the symmetry and electromagnetic band-gap property of periodic structures; providing an interesting phenomenon: two frequency bands (located at 8.8 GHz and 11.35 GHz) could be respectively switched as pass or stop-band just by changing the angles of incidence wave. Firstly, the single S-LSPs resonator is investigated and designed at X-band frequency range. Then, the X-band frequency selective surface prototype consisting of a 15×15 S-LSPs resonator array is demonstrated. Finally, the performance of the proposed frequency selective surface is measured, and the measured results agree well with the simulated results.