3D Frequency Selective Surface with incident angle independence

A novel 3D tapered Frequency Selective Surface (FSS) which is independent of incident angle is proposed. This new type of FSS is a modification from a 3D FSS consisting of square cross section cylinder unit elements. By enlarging the aperture of the square cross section cylinder resonators, the transmittance of the FSS becomes independent of the incident angle of radiation. Moreover, transmission response is stable under oblique incidence angles from 0 to 45 degrees. The influence of key design parameters on 3D Tapered FSS characteristics has been investigated using CST simulation software.