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Permittivity measurement of a gel

Question asked by sercaspa on Dec 1, 2015
Latest reply on Feb 6, 2016 by sercaspa

I've been working with the 85070E coaxial probe and the E5072A vector network analyzer for dielectric characterization of semisolid materials, specifically gels like gelatin or jelly. My problem is that S ~11~ parameters are highly dependent on the applied pressure over the gel surface, due to the deformation of the material, so I don't know if I'm getting the "real" permittivity of the sample. I thought that the best solution is to press the maximum without breaking the gel in order to avoid air gap between the probe and the gel surface, but it could change the gel density and thus its dielectric properties. Does anyone know how to solve the problem or has worked with semisolids?