Heating experiments on phantoms and miniature pigs were made by using two lens applicators and a waveguide applicator fed by the 430MHz microwave heating system (HTS-100, producted by Tokyo Keiki Co., Ltd.). Temperature distributions of agar phantoms and miniature pigs were measured at regular intervals during heating. As the results of these experiments, the followings are obtained.
1. The results of effective heating depth varying with a focal length confirm lens effect.
2. Using a four-aperture lens applicator and miniature pigs, the heating depth of 6cm and it almost doubles that of the ordinary waveguide applicators. The heating area is 12cm x 6cm at 4cm depth.
3. Dielectric properties of miniature pig buttocks are nearly equal to these of the agar phantom containing 0.35% NaCl and 0.05% NaN3.
