A recursive T‐matrix algorithm for strips and patches

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Abstract
A recursive T‐matrix algorithm (RTMA) is formulated to extend its applicability to infinitely thin and conducting scatterers. Canonical geometries consisting of strips or patches are considered. These geometries have direct application in finite‐size frequency selective surfaces (FSSs). The formulation of this T‐matrix algorithm starts from the method of moments (MOM). Thus, the connection between the MOM and the T‐matrix algorithm is established. Three‐dimensional patch problems are formulated analogously to the two‐dimensional strip problems so that the need to use the vector addition theorem for the patch problems is eliminated and a unified formulation results. The T‐matrix for a single strip or patch is also derived using MOM ideas. Computation of the current distributions on the conducting scatterers is also achieved. Results displaying the radar cross section (RCS) of and the current distribution on a sample FSS geometry are presented.

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