ANALYSIS OF DIELECTRICALLY LOADED RADIATORS USING ENTIRE-DOMAIN GALERKIN TECHNIQUE

The response of various types of dielectrically loaded radiators to a time-harmonic excitation is analyzed, by employing an integral-equatio n formulation in conjunction with an entire-domain Galerkin technique. Coupled integral equations are derived in the frequency domain. These are written in terms of the conductivity currents or/and the electric fields developed on the conducting surfaces or/and inside the dielect ric materials, respectively. They are solved via the Method-of-Moments technique. In particular, an entire-domain Galerkin technique is empl oyed, and proves very efficient, when rather specific geometries are c onsidered and appropriate ''intelligent'' basis-function sets are chos en, accelerating the convergence of the method. To prove this claim, t hree representative antenna structures, of significant practical use, corresponding to the three types of geometries (cylindrical, spherical , and planar), are solved in the resonance region. Parallelization of the developed sequential code is employed, in order to extend the use of Galerkin technique to electrically large structures. The validity o f the proposed method is checked, and numerical results are presented for several cases.