Complex permittivities of biological samples with the free space method from 18 to 110 GHz
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Complex permittivities were measured with the free space method from 18 to 110 GHz. Physiological saline and porcine blood ware measured. These measurement results were compared with those obtained from the coaxial probe method from 18 to 50 GHz. The measurement results were also compared with those derived from Cole-Cole models from 18 to 110 GHz. It is shown that differences in the measured complex permittivities between the free space method and the coaxial probe method were smaller than 10% from 18 to 50 GHz in both physiological water and porcine blood. Furthermore, the differences in the complex permittivities between the free space method and Cole-Cole models were smaller than 8% from 18 to 110 GHz. It was concluded that the free space method is an effective technique to determine complex permittivities of biological samples in the millimeter-wave frequency region.
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