Wideband Reference-Plane Invariant Method for Measuring Electromagnetic Parameters of Materials

K. Chalapat, K. Sarvala, Jian Li, G.S. Paraoanu
2009 IEEE transactions on microwave theory and techniques  
This paper presents a simple and effective wideband method for the determination of material properties, such as the complex index of refraction and the complex permittivity and permeability. The method is explicit (non-iterative) and reference-plane invariant: it uses a certain combination of scattering parameters in conjunction with group-velocity data. This technique can be used to characterize both dielectric and magnetic materials. The proposed method is verified experimentally within a
more » ... quency range between 2 to 18 GHz on polytetrafluoroethylene and polyvinylchloride samples. A comprehensive error and stability analysis reveals that, similar to other methods based on transmission/reflection measurement, the uncertainties are larger at low frequencies and at the Fabry-Perot resonances.
doi:10.1109/tmtt.2009.2027160 fatcat:yj45aszuovdkxhovywfwtrqws4