FDTD ANALYSIS OF EW WAVE CIRCULATING BY A MAGNETIZED FERRITE BODY IN FREE-SPACE

An efficient numerical method has been devised for the study of wave c irculating by a magnetised ferrite body of an arbitrary shape. It is a finite-difference time-domain formulation that incorporates Mur's abs orbing boundary conditions and a perfectly matched layer. Several shap es of interest have been studied, including spheres, circular cylinder s. The electromagnetic fields inside ferrite and the power-density dis tribution on the ferrite's surface normal to the bias external magneti c field are obtained. It is observed that an incident plane wave would circulate around the magnetised ferrite body in an open space as if t he ferrite were placed inside a waveguide junction circulator.