Radiation characteristics of a coaxial waveguide with eccentric inner conductor for application in hyperthermia and microwave reflex therapy

[摘要] This paper examines the radiation characteristics of a contact emitterconceived for application in hyperthermia and microwave reflex therapy. Itis important to analyse the distribution of power density in the near fieldarea, as the radiator's therapeutic sphere of activity is localized here.The contact emitter is a coaxial radiator with an eccentric course of theinner conductor. According to Huygens principle, a theoretical view of thenear field radiation characteristics is made by determining the equivalentcurrent densities in the emitter aperture. It is shown that by an eccentricshift of the inner conductor, an almost isotropic near field radiationpattern and power density can be achieved. For this, the electromagneticfield in the emitter aperture is determined by using a Bipolar coordinatesystem. This calculation considers only the fundamental TEM mode of thecontact emitter. Besides the theoretical results near and far fields aresimulated using the programme system Ansoft HFSS.

[学科分类] 电子、光学、磁材料