Plane Wave Scatteringat a Shorted Ring Frequency Selective Surfacewith Non Dominant Mode Coupling

A plane wave scattering at a screen periodically perforated by the shorted ring slots is considered. A shorted ring slot is formed by an annular aperture shorted by a pair of metal bridges. Polarization sensitive transmission of the incident TE₀₀-mode is discussed. In contrast to a conventional design, such a transmission occurs at the wavelength which is closely equal to a half of the ring slot circumference. An electromagnetic coupling by means of a non dominant mode of the shorted ring slot makes it possible.