EM scattering analysis of a ferrite cylinder by a FD-FD technique with an effective absorbing boundary condition and MEI

Electromagnetic scattering problem of an arbitrarily shaped ferrite cylinder is analyzed based on the finite difference-frequency domain(FD-FD) method with an effective numerical absorbing boundary condition (ABC) and the measured equation of invariance (MEI) on the terminated boundary. Compared with the method of moments (MoM), both the numerical ABC presented in this paper and the MEI result in dramatic savings in computing time and memory requirement for electrically large objects due to the sparsity of the finite difference equation. The absorbing characteristic of this numerical ABC is demonstrated numerically. The accuracy, memory needs and CPU time of the FD-FD with the numerical ABC or the MEI and the MoM are compared and then result in some important conclusions. Besides, the RCS of some ferrite cylinders are presented.