Arbitrary source effects on finite frequency selective surfaces

The authors study the effects of multiple incident angles on a particular FSS (frequency selective surface) of finite width and show how these effects may be offset by tapering the surface along the direction of variation in the incident field. The results of a numerical study of the finite FSS illuminated by an arbitrary wave are presented. A comparison of the power reflection coefficient is provided for the following cases: (1) scattering from an infinite periodic surface due to a plane wave incident from theta =30 degrees ; and (2) scattering from a uniform, finite-width frequency selective surface of 15 elements due to an incident field that varies in x as the H-plane cut of an E-plane sectoral horn.<>