TDIE/FDTD Hybrid Method And Its Application

This paper deal with the a computational electromagnetics method,which enables the interactions between arbitrary shape antennas and inhomogeneous dielectric volumes in time domain to be analyzed. Such as an arbitrarily-oriented thin wire antenna fed with pulse voltage located in the vicinity of a human body.Finite Difference Time Domain Method (FDTD) is ideal for treating the inhomogeneous dielectric volumes, but difficult to modeling arbitrary shape antennas, such as arbitrarily-oriented thin wire antennas. Time Domain Integral Equations Method (TDIE) is well-suited for the study of arbitrary shape antennas. However, the application of classical TDIE to penetrable inhomogeneous dielectric presents exorbitant computational complexity and memory requirement.The TDIE/FDTD hybrid method is the technique that combines FDTD and TDIE. Taking advantage of the capability of FDTD to analyze inhomogeneous bodies with arbitrary material properties and that of TDIE to deal with arbitrary shape antennas located in free space, and take account of the direct coupling of antennas and dielectrics, TDIE/FDTD approach can simulate the problems of arbitrary shape antennas located in the vicinity of inhomogeneous objects in time domain.1. The Frequency-Dependent Finite-Difference Time-Domain method ((FD)2TD) is studied, and is employed together with an anatomical based model of human body with resolution of 3mm to analyze the exposure of a human body in the far field of electromagnetic pulse sources.2. An novel integral equation based scheme for transient scattering from inhomogeneous dispersive bodies is proposed.3. A temporal basis function is proposed for accommodating the highest temporal derivative in the scheme mentioned in 2.4. A treatment of wires junctions is proposed for wire structures TDIE solver.5. The TDIE/FDTD hybrid method combining FDTD and TDIE is studied. Numerical results that validate the hybrid method are presented.