Heating of Lossy Films on A Metal Surface Using a Dielectric Loaded T-Septum Waveguide

Finite element method calculations have been performed on aT-septumwaveguide to investigate the possibility of heating lossy dielectric film mounted on a metal surface. The results indicate that additional lossless dielectric loading is required above the septum to provide the necessary electric field to heat the lossyfilm. A parametric study reveals that significant power deposition can occur in the film provided the permittivity of the lossless dielectric loading is high. Measurements on an applicator have shown that the temperature of a lossy film painted on a metal surface can be increased by more than 40°C. The temperature rise is related to the thickness of the film, septum height, and the position and permittivity of the low loss dielectric loading.