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Abstract
We present in this paper a coaxial applicator in which the radiating source is a circular slot realised by exterior conductor interruption of a coaxial guide. The guide is immersed in a strong dissipated medium. A dielectric material girdle without losses or an air layer is inserted among the radiating slot and the load. In this paper, we study a single slot radiation and analyse the radiating field distributions in the load, the approaching field influences and the role of dielectric girdle on the dissipated power distribution in the load.