Electromagnetic scattering from gyroelectric anisotropic particle by the T-matrix method

Abstract

A T-matrix solution is developed for the aim of predicting the electromagnetic scattering behaviors from a nonspherical gyroelectric particle. The theoretical treatments is implemented within the framework of the extended boundary condition method (EBCM), where a system of quasi-spherical vector wave functions (qSVWFs) for expanding electromagnetic fields inside gyroelectric media is derived by using an inverse Fourier transform operation. As verification, comparisons are made between numerical results obtained using the presented method and those published data calculated using other methods. Very good agreements are achieved for the present cases, which partially indicate the correctness of the derived theoretical formulae and the home-made program. Influences of shape deformation as well as of anisotropy components in permittivity tensor upon the scattering properties are then analyzed. Numerical results show that a dramatic decrease in radar cross sections (RCSs) level occurs when the gyroelectric cross terms are included in the permittivity tensor, and a clear shift of peaks in RCSs to smaller angles is displayed as a prolate spheroid is deformed to an oblate spheroid.