Testing of dielectric properties of biological tissues in microwave range for solving matching problems

Since the employment of microwave energy for defrosting biological tissues and for microwave-aided diagnosis in cryosurgery is very promising, the problem of ensuring the match between the contact antennas (applicators) and the frozen biological object has become a pressing one. It is for this reason that investigations were aimed at the study of the dielectric properties of the dog's muscular and fatty tissues in a temperature range of +20 to -30 degrees C including the phase transition of the samples to the solid state. The investigations were performed in a waveguide device using a short-circuit method. During the investigation possible error was estimated. The experiment provides for the reduction of the error caused by the waveguide linear expansion.