UNCERTAINTY ANALYSIS OF THE RATIONAL FUNCTION MODEL USED IN THE COMPLEX PERMITTIVITY MEASUREMENT OF BIOLOGICAL TISSUES USING PMCT PROBES WITHIN A WIDE MICROWAVE FREQUENCY BAND

The PMCT probe, saying, one kind of open-ended coaxial probe adopted widely in microwave coagulation therapy of cancer, has been used to measure the complex permittivity of freshly excised specimens of normal animal tissues. The RFM model for PMCT probe is developed to extract the anticipant permittivity of specimens under test. In addition, the efiects of several factors on the measurement results have been considered and discussed, including difierent temperature and reference materials, as well as the sampling frequency range and intervals of the rational function model. All the experiments have been conducted at the microwave frequency range from 450MHz to 14.5GHz.