Finite Element Calculation of Microwave Absorption by the Cranial Structure

Abstract

Abstract-Using an axisymmetric inhomogeneous lossy dielectric model of the human cranial structure, calculations yielding interiorabsorbed power density spatial distributions and whole-body cross sections are presented. These computations are preformed by way of a finite element implementation of the coupled azimuthal potential formulation. Results are considered for two angles of plane wave incidence, with two orthogonal polarizations, at the frequencies of 1 and 3 GHz. model. Attention is given to the sensitivity of "hot spot" intensities to incident field orientations and model parameter uncertainties.

Finite-difference time domain method for light scattering by small ice crystals in three-dimensional space

“…There is a significant gap between the Rayleigh theory and the geometric optics approximation for the region of size parameters known as the resonant region. 13 Although numerous promising approaches, including the method of moments, 14,15 the discrete-dipole approximation, [16][17][18] the digitized Green-function technique, 19 the integral equation technique, 20 the T-matrix or extended boundarycondition method, 21,22 and the multiple-scattering approach, 23 have been developed for the solution of light scattering by small nonspherical particles, they are usually applicable to size parameters less than approximately 15 in practice and/or to specific shapes with smooth and continuous surfaces as a result of numerical stability requirements.…”