TISSUE IMPEDANCE MEASUREMENTS USING THE MICROWAVE NETWORK ANALYZER
Authors not listed
The authors describe using a microwave network analyzer to measure tissue dielectric properties from 0.1 to 18 GHz with estimated errors around 2%.
Plain English Summary
The method uses a modified Roberts-von Hippel technique with a microwave network analyzer to measure the reflection coefficient from a tissue sample confined by a teflon plug in a precision coaxial line. Achieving high accuracy requires quarter-wavelength sample lengths, thickness measurement within 0.001 cm, and calibration against known terminations each time a sample is measured. Tests on distilled water, physiological saline, and methanol showed close agreement with known dielectric values, validating the technique.
Why This Matters
The reflection coefficient is most sensitive to tissue dielectric properties when the sample length is near one-quarter wavelength in the material, where it is nearly real and near a minimum. System errors are modeled as a one-port error network whose S matrix is measured using a precision short circuit, a quarter-wave displaced short circuit, and a sliding 50 ohm load at three positions.
Show BibTeX
@article{tissue_impedance_measurements_using_the_microwave_network_analyzer_g5443,
author = {Unknown},
title = {TISSUE IMPEDANCE MEASUREMENTS USING THE MICROWAVE NETWORK ANALYZER},
year = {n.d.},
}