Adaptive Finite Element Analysis for Optimized Design of Coaxial Antenna Fed DI Water-Stowed Waveguide Applicator for Therapeutic Local Hyperthermia System

In this paper, coaxial antenna is used to couple electromagnetic energy into waveguide coupled applicator. The water-stowed, indirectly cooled optimized coaxial coupled waveguide applicator has been developed for local hyperthermia applications using Adaptive Finite Element Method. High permittivity deionized (DI) water is used for indirect cooling in bolus for reduced size of waveguide applicator. The water loading also provides a good coupling of the radiated power into body tissue. The optimization is hence achieved and verified by measuring S parameter and specific absorption rates (SAR) which are found to be satisfactory for localized superficial hyperthermia treatments. The results indicate that coaxial coupling provides better focusing of microwave energy.