Author(s)

D. Poljak & C. A. Brebbia

Abstract

Dielectric coated wire antennas in free space are modelled via an efficient Galerkin-Bubnov Boundary Element scheme. The formulation is based on the Pocklington integro-differential equation for loaded wires with the dielectric coating being taken into account by means of an equivalent magnetic coating load term added to the equation. Keywords: dielectric coated wire antennas, Pocklington integro-differential equation, Galerkin-Bubnov Boundary Element Method. 1 Introduction Dielectric coated antennas are often preferable over bare wires when used in applications involving finitely conducting medium such as microwave hyperthermia, geophysical exploration or subsurface communication. The use of these antennas avoids the often undesirable contact between them and the surrounding medium. Moreover, the radiation efficiency of the antenna can be improved when using coatings [1]. One of the principal applications of coated antennas is in microwave hyperthermia, i.e. the treatment of cancer by heating the malignant tissue. The high temperature thus generated inside the tumor tissue has a cytotoxic effect, and it is useful in both chemotherapy and radiation therapy. This tissue heating must be localized to maintain the temperature within the tumor tissue up to 43oC, for a given time period, while the neighbouring tissue temperature level is far below 43oC [1]. The insulated antennas are inserted into

Keywords

dielectric coated wire antennas, Pocklington integro-differential equation, Galerkin-Bubnov Boundary Element Method