A new hybrid technique based on a combination of the method of moments and finite difference schemes in the time-domain

This paper presents a new hybrid method that efficiently combines two versatile numerical techniques, viz., the finite difference time domain (FDTD) and the method of moments in the time domain (MoMTD). The hybrid method is applicable to complex geometries comprising thin wires and arbitrary inhomogeneous dielectric structures. It employs the equivalence theorem to separate the original problem into two sub-problems, viz., the region containing the wires, which is analyzed by using the MoMTD, and the dielectric zone that is modeled with the FDTD. The application of the method is illustrated by analyzing the canonical problem of a thin bent-wire antenna located in the proximity of a perfectly-conducting ground plane.