A <scp>reflection‐only</scp> method for characterizing <scp>PEC‐backed</scp> anisotropic materials using waveguide higher order modes

This paper presents a new reflection-only set-up for characterizing the properties of an anisotropic PEC-backed materials. Albeit, the reflection-only methods are established long ago, they are not elaborated appropriately for retrieving industrial anisotropic materials. In spite of other researches, this method is capable to determine tensors of both permittivity and permeability of an anisotropic PEC-backed material. In contrast to similar researches, this method is mathematically simple and easy to implement. Tensors of epsilon and mu of PEC-backed sample are characterized by rotating sample and measuring reflection coefficient in various configuration. Not measuring the transmission, in order to provide enough equations, the higher order mode of the waveguide is employed. A three-port probe is designed for this goal and optimized to excite the TE(10)and TE(20)modes simultaneously. Good agreement of retrieved parameters from experimental measurements with those of actual ones shows the reliability of this set-up for characterization of PEC-backed anisotropic composites.