Abstract-Medical applications of microwaves (i.e., a possibility to use microwave energy and/or microwave technique and technology for therapeutical purposes) are a quite new and very rapidly developing field. Microwave thermotherapy is being used in medicine for cancer treatment and treatment of some other diseases since early eighties. This paper is a contribution to a theory of phase array applicators to be used for a microwave thermotherapy (microwave hyperthermia) in a cancer treatment. It deals with a study and theoretical evaluation of homogeneity of SAR distribution in cylindrical agar phantom for several different values of its radius. Discussed SAR distribution is in our case created by simulations of EM field exposure done by aid of four microwave stripline type TEM mode applicators of the same type.

Paper deals with a description of research activities in the field of Microwave Medical Diagnostics and Treatment done at the Dept. of EM Field, Czech Technical University (CTU) in Prague. History of these activities goes to year 1981, when the first apparatus for microwave hyperthermia cancer treatment has been developed at CTU and one year later started to be used for oncological patient treatments at Institute of Radiation Oncology (Hospital Bulovka in Prague).In present time we have several areas of research activities dealing with applications of microwave theory, technique and technologies in medical diagnostics and therapy.Future trends in medical applications of microwave technique and technology can be seen in development of new diagnostic and imaging methods based on microwaves. A significant importance for the future can be identified for the following microwave methods: Tomography, Radiometry, Measurement of complex permittivity, Imaging in the Terahertz waves band and Diagnostic radars.

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This paper is a contribution to a the applicators to be used for microwave hyper treatment. In more details this paper deals wit an evaluation of homogeneity of SAR dis phantom for its changing radius. Discussed SA this case created by EM field exposure don microwave stripline type TEM mode applic type. Keywords-applicator, hyperthermia, exposure of EM fieldI.