A DUAL NORMAL MODE REPRESENTATION FOR ELECTROMAGNETIC SCATTERING: SOME INITIAL CONSIDERATIONS

Abstract

This paper presents a new technique for characterizing the electromagnetic interaction with and scattering from objects of finite extent. By exploiting the structure of the operators (in this case matrices) associated with the interaction, it is shown that both the system (impedance) matrix and the transfer (admittance) matrix can be partitioned into a sum of two matrices such that each of the resulting matrices can be decomposed into a set of normal modes. As a result, the number of parameters needed to describe the interaction is now significantly reduced and the parameters identified by this technique are model independent, i.e. they are measurable parameters. Potential applications of the technique include EM computations, compact descriptions of scatterers and antennas, interpretation of measured data, and algorithm development applicable to scattering and inverse scattering problems. [Vol. 3, No. 2, pp. 28-56 (1988)]