A hybrid FIT/MOM approach for EM analysis involving penetrable objects

A hybrid method is presented for the analysis of rotationally symmetric 3D electromagnetics problems in which the system may consist of penetrable inhomogeneous materials as well as a perfect electric conductor. The method uses the finite integral technique (FIT) to model Maxwell´s equations in an interior region which includes all inhomogeneous objects. A boundary integral equation, enforced using the moment method, allows coupling to the unbounded exterior region. Boundary truncation is accomplished using a dual surface field equivalence principle to formulate an integral equation which is then enforced using the moment method. The dual surface allows for use of both electric and magnetic field values at locations where they are well defined in terms of the chosen basis functions. If a single surface is used, one field type must always be evaluated at a location where it may not be well represented by the basis functions. Three different integral equation formulations are investigated, the electric field (EFIE), magnetic field (MFIE), and combined field (CFIE) formulations. Results from the method are compared with analytic solutions and other computed solutions.<>