An inexpensive backside-sensing coplanar waveguide sensor for characterization of liquids and solids up to 40 GHz

Abstract

We present in this paper an inexpensive sensor realized on printed circuit board for broadband dielectric characterization of both liquids and solids. It is based on a CPW-CPW transition and statistical calibration. The specific property of the approach is that no assumption regarding cascading transmission lines with different properties has to be made as permittivity is obtained by a single-tier calibration. The sensor is validated by measurements of methanol and PDMS.