The purpose of this paper is to compare the three most used microwave thermo therapeutic applicators in hyperthermia oncology treatment. In this case we have been focused on the applicator's radiation pattern from the aperture, and the depth of effective penetration of biological tissue. Applicators used in this survey are: TEM wave horn applicator, Lucite horn applicator, and TE_10 horn applicator. All three of them have the same size of aperture, which makes them easy to compare. Simulations are performed in simulator of electromagnetic field SEMCAD BERNINA 13.4. Effective size of the aperture and the depth of effective penetration are computed in SEMCAD BERNINA 13.4.
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