Bidimensional analysis of planar applicators from spectral domain approach method for 915 MHz hyperthermia

A two-dimensional model of a microstrip-microslot resonator with a protective layer in contact with a multilayered lossy medium is presented. This analysis is based on the spectral domain approach (SDA). Theoretical and experimental results on the resonant frequencies, the power deposition, and the heating patterns of a planar applicator radiating into a human body or phantoms are presented. This work makes it possible to obtain the complex resonant frequency, i.e., the resonant frequency and the Q factor of the structure and the power deposition from which the thermal pattern can be obtained. Good agreement between two-dimensional theory and experiment is obtained. Therefore, this approach constitutes an additional numerical simulation tool which makes it possible to obtain a better optimization of the geometrical parameters of the applicator and to optimize the efficiency of hyperthermia treatments by a better knowledge of the temperature pattern in the heated tissues.<>