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Open-Ended Coaxial Dielectric Probe Effective Penetration Depth Determination

We have performed a series of experiments, which demonstrate the effect of open-ended coaxial diameter on the depth of penetration. We used a two-layer configuration of a liquid and movable cylindrical piece of either Teflon or acrylic. The technique accurately demonstrates the depth in a sample for...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2016-03, Vol.64 (3), p.915-923
Main Authors: Meaney, Paul M., Gregory, Andrew P., Seppala, Jan, Lahtinen, Tapani
Format: Article
Language:English
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Summary:We have performed a series of experiments, which demonstrate the effect of open-ended coaxial diameter on the depth of penetration. We used a two-layer configuration of a liquid and movable cylindrical piece of either Teflon or acrylic. The technique accurately demonstrates the depth in a sample for which a given probe diameter provides a reasonable measure of the bulk dielectric properties for a heterogeneous volume. In addition, we have developed a technique for determining the effective depth for a given probe diameter size. Using a set of simulations mimicking four 50- Ω coaxial cable diameters, we demonstrate that the penetration depth in both water and saline has a clear dependence on the probe diameter, but is remarkably uniform over frequency and with respect to the intervening liquid permittivity. Two different 50- Ω commercial probes were similarly tested and confirm these observations. This result has significant implications to a range of dielectric measurements, most notably in the area of tissue property studies.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2016.2519027