A Novel Bandstop Frequency Selective Surface Using Coupled Split Ring Resonators

In this paper, a bandstop frequency selective surface is devised using coupled split ring resonators. A four-SRR unit cell is the building block of the FSS. Split rings arranged in a round robin fashion gives polarization insensitive transmission characteristics. A modified structure is proposed to eliminate the dependence of the transmission characteristics on the angle of incidence. A considerably good performance was obtained for oblique incidence up to 75° and a 40% size reduction is also achieved. The structure can be further enhanced by improving the passband performance at oblique incidence.