Radiation From an Encapsulated Hertz Dipole Implanted in a Human Torso Model

Radiation from an encapsulated Hertz dipole, eccentrically implanted in a layered spherical body, is determined by use of the dyadic Green's function (dGf) theory. The body, a model of the human torso, comprises skin and fat layers around a homogeneous tissue core. The capsule is a spherical cavity bounded by an insulating layer. The dGf of this radiation problem involves two reference points, the center of the body and the center of the capsule. The analysis results in a concise formulation of the dGf and of the main radiation quantities. Numerical results are shown for the radiated power, efficiency, and directive gain of the Hertz dipole versus the capsule displacement from the center of the body. Specific absorption rate (SAR) maps are drawn on two cross sections of the body in search of the entire distribution of SAR and the location of peak SAR.