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Abstract
A full Green's function approach is taken to formulate an infinite planar periodic structure, such as a phased array, with arbitrarily shaped elements. A reaction integral equation is then written and solved by the moment method with Galerkin weighting. The metallic surface of the array element is modelled by triangular surface patches similar to those of Rao, Wilton and Glisson [4]. This method is suitable for planar periodic structures, such as phased arrays or frequency selective surfaces, with unit cells that are of arbitrary 3-D shape and may contain induced currents perpendicular to the array plane. This general and versatile computer program has been extensively checked against data in the literature and with our measurements, and good agreements were observed.