PROJECT TITLE :
Closely spaced tri-band frequency selective surfaces based on split ring slots
A tri-band frequency selective surface (FSS) with close band spacing primarily based on split ring slots for y-polarised incident waves is investigated. The close band response is obtained by reducing the robust mutual coupling between the closely packed concentric rings through splitting the ring slots and redistributing the placement of the surface currents at resonances. To validate the proposed FSS, a Ka band FSS was designed, fabricated and tested. Experimental results showed closely spaced resonances at twenty seven.three, 31.seven and 36.two GHz. Frequency ratios of 1.16 for the second to the first resonance, and one.14 for the third to the second one were obtained. Conjointly, good stability is observed for oblique incidence.
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