It is demonstrated that a theory of zero-order mode resonator (ZOR) metamaterial (MTM) structure can be used for the\ndevelopment of a novel class of applicators for microwave thermotherapy, for example, for hyperthermia in cancer treatment or\nfor physiotherapy.The main idea of creating such an applicator is to generate and radiate a plane electromagnetic (EM) wave into\nthe treated biological tissue, at least in a certain extent. The main aim of this paper is to investigate whether an EM wave generated\nby ZORMTM structure and emitted into the biological tissue can produce a homogeneous SAR distribution in the planes parallel\nto the applicator aperture and achieve a penetration depth approaching the theoretical limit represented by SAR distribution and\npenetration depth of an ideal EM plane wave. EM field distribution inside a virtual phantom of the treated region generated by the\napplicator that is based on the proposed ZOR MTMprinciple is investigated using a well-proven full-wave commercial simulation\ntool.The proposed applicator type shows both a low unwanted leaked electromagnetic field and a fairly homogeneous electric field\nin its aperture as well as in the virtual phantom of the treated region.
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