A three-dimensional (3-D) time-domain numerical scheme for simulation of ground penetrating radar (GPR) on dispersive and inhomogeneous soils with conductive loss is described. The finite-difference time-domain (FDTD) method is used to discretize the partial differential equations for time stepping of the electromagnetic fields. The soil dispersion is modeled by multiterm Lorentz and/or Debye m...

The finite-difference time-domain (FDTD) technique has been used to model the one-dimensional (1-D) surface impedance of a lossy earth plane having discontinuities in two and three dimensions. Using a horizontal magnetic field aperture source located five cells from an absorbing boundary and 35 cells above the lossy earth plane, the surface impedance was accurately modeled at a distance of 0=50...

Accurate determination of the specific absorption rate (SAR) is an important aspect in understanding the interaction between electromagnetic fields (EMF) and living matter. Influences due to dielectric properties, shape, and size of the exposed tissues have been considered to play an important role in the determination of SAR distributions in anatomical rat models [1-2]. Direction and polarisat...

Arbitrarily-shaped dispersive media can be treated with the contour-path (DCP) FDTD method. We extend DCP-FDTD method for analysis of a periodic structure to case at oblique incidence. A trapezoidal recursive convolution technique is used incorporate into The transmission characteristics metallic cylinder array are evaluated and discussed. It found that present gives almost same solution as con...

This paper presents an efficient method to accurately solve large body scattering problems with partial circular sym­ metry. The method effectively reduces the computational domain from three to two dimensions by using the reciprocity theorem. It does so by dividing the problem into two parts: a larger 3-D region with circular symmetry, and a smaller 2-D region without circular symmetry. An fin...

Contact current, defined as indirect effects of electromagnetic fields, flows a human body when contacting with an object such as a metal structure at a different electric potential, and may stimulate muscle and peripheral nerve. Thus, numerical analyses of electric fields induced by contact currents in a human body have been performed. Computational methods and evaluations of effects of transi...

INTRODUCTION Technologies with millimeter-waves (MMWs) have been popularized in our daily life. It warrants to investigate biological effect to concern MMW exposure. In the recent research, ocular injuries caused by MMW exposure were discussed[1]. In that in-vivo study, rabbit eyes were exposed to MMW at 60GHz to observe clinical courses of ocular damages. It is not clear the causal connection ...

Abstract A multiscale methodology that couples a finite difference time domain (FDTD) system (representing an elastic continuum) and an atomistic molecular dynamics (MD) system is proposed. The handshaking involves a parallel coupling of both the length and timescale. The FDTD–MD ‘interface’ is probed by a wave packet and the elastic impedance mismatch between the two systems is studied by exam...

The advantages of the finite-difference-time-domain (FDTD) method are often hampered by the need to model large ‘‘white spaces’’ between and around scattering objects. In the continuous realm, these large spaces are customarily bridged by the usage of integral operators that transform the sources to any observation point using an appropriate Green’s function. A companion procedure for the discr...

We demonstrate how a tightly-focused coherent TEMmn laser beam can be computed in the finite-difference time-domain (FDTD) method. The electromagnetic field around the focus is decomposed into a plane-wave spectrum, and approximated by a finite number of plane waves injected into the FDTD grid using the total-field/scattered-field (TF/SF) method. We provide an error analysis, and guidelines for...