ELECTROMAGNETIC SCATTERING AND RADIATION INVOLVING DIELECTRIC OBJECTS

The influence of dielectric objects on electromagnetic fields is an im portant consideration in many engineering problems. In some applicatio ns, the scattering from dielectric objects for a known incident field is of interest. In other situations where dielectric objects interact with radiators - such as biological tissue near a wireless transceiver or a dielectric loaded antenna - the resulting input impedance, far-f ield radiation and power absorption characteristics are important quan tities to determine. In this work an integral equation approach is use d to solve these problems for which the method of moments is applied t o facilitate a numerical solution. A comprehensive computer program wa s developed that handles both scattering and radiation problems. With the computer program both dipole and superquadric loop antennas can be modeled which have any arbitrary relative location and orientation to dielectric bodies of interest. The implementation is verified by comp arison with finite-difference time-domain results and available measur ed data for both a scattering and radiation problem involving dielectr ic objects. It is then used to study some diverse situations which wou ld be difficult to handle with standard Cartesian grid finite-differen ce time-domain, including: monostatic radar cross section of a dielect ric slab with various conductivities; dipole and superquadric loop rad iators printed on a dielectric substrate; and loop antennas in close p roximity to a model of the human head.