COMMONALITIES OF THE SEM PARAMETERS OF SEVERAL SIMPLE THIN WIRE GEOMETRIES

Abstract

ABSTRACT The Singularity Expansion Method (SEM) parameters (natural frequencies, natural modes, and coupling coefficients) are presented for several different geometries each composed of four arbitrarily-oriented, thin, straight wire scatterers with one end of each of the four straight members connected at a common intersection point. Various choices of the orientations (and lengths) of these four members result In specific configurations which have been investigated previously (perpendicular crossed wires, planar symmetric tri-arm, L-shaped wire, and straight wire) as well as several other configurations which have not (nonplanar symmetric and nonsyrametrlc tetra-arms, nonplanar symmetric and nonsymmetrlc trl-arms, and arbitrarily bent wire). The SEM parameters for the general tetra-arm structure are calculated for a wide range of geometrical configurations. Commonalities which exist between the SEM parameters of the general tetra-arm scatterer and the previously analyzed “dipoles”, “tripoles” and “cross...