Millimeter wave irradiation and invasion into living bodies by the anti-reflecting effect

The microwave invasion into living bodies at a millimeter wave irradiation is described. The power sources of millimeter wave are Impatt oscillators (94 GHz, 0.15 W and 0.3 W) for the irradiation tests and Gunn oscillators (90 and 100 GHz, 13 mW) for the reflection study. The irradiation antennas of the system consist of a Teflon rod dielectric antenna ,and a Teflon sheet dielectric antenna set at 2.4 - 5.0 mm diameter catheter waveguide vent. Preliminary measurements on the denaturation distribution and the surface temperature of irradiated beefs suggest that they are suitable for common irradiation apparatus for living bodies in similar case as previous reports. Transmission tests through catheter waveguides confirm the normal operation of the irradiation apparatus for living bodies. The power absorption of a living body surface is large in these wavelength regions, because the reflection of the wave are well hold down (impedance-matching) by the anti-reflecting layers (ARL) of dielectrics. Transmission loss is small by a long Teflon rod dielectrics which can be used a flexible waveguide. Otherwise the anti- reflecting effect is strongly influenced by the internal diameter of the waveguide.