1988 Volume 4 Issue 2 Pages 151-161
A new type of applicator for microwave local hyperthermia, which can penetrate the electromagnetic energy deeper in lossy dielectric medium than a conventional waveguide applicator, has been developed. This applicator, which consists of an integrated waveguide array, whose aperture size is 212mm × 80mm is operated at 430MHz. A water bag is attached on the aperture to perform the body surface cooling. Furthermore, the applicator can be filled with water as a dielectric material, and it becomes compact in size and the impedance matching to the directly contacted is improved. This applicator has the movable metallic plates, which are set inside the applicator, to control the phase of the electromagnetic field in the aperture and it can control the heating pattern and change the depth of the tissues within the hyperthermic temperature. The radiated field distributions of this applicator were measured in a saline solution, and it was confirmed that the temperature distribution in hyperthermic range was performed in to the dobule portion comparing the heating by a conventional waveguide applicator. The results of the theoretical analysis and heating experiments with phantom model show that the maximum depth of heating by this newly developed applicator is approximately 60mm below the surface.
