Vector Potential Dyadic Green’s Function and Normal Modes in Cavity of Arbitrary Shape

Abstract

A semi-analytical approach for rapid calculation of the vector potential normal modes and dyadic Green's function inside the cavity of irregular shape over a broad range of frequency is presented. The method is based on the extraction of the Green's function at an imaginary wave number from itself to obtain a rapidly convergent hybrid spatial-spectral expansion of the Green's function. The extracted term encompasses the singularity of the Green's function and is computed using surface integral equation. The method is applied to a V-grooved cavity to obtain the vector potential Green's function inside the cavity.