Abstract
Two coaxial line techniques for the determination of complex permittivities of solid and liquids are described. The first, the matched termination method, is essentially a comparison technique using air as the reference dielectric, producing accurate values of ε′. In the second, the resonant line method, the characteristic impedance termination is replaced by an adjustable short circuit. This method was developed primarily for the purpose of determining the values of tan δ in low loss materials. Both methods can be used for frequencies in the 200 MHz to 9 GHz range and normally require only conventional apparatus. The results obtained for the materials under test agreed well with the published data, thus underlining the suitability of the two techniques for dielectric measurements.
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Kulesza, B.L.J., Thorp, J.S. & Ahmad, A.B. Coaxial line methods for measuring permittivity and dielectric loss. J Mater Sci 19, 915–922 (1984). https://doi.org/10.1007/BF00540461
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DOI: https://doi.org/10.1007/BF00540461