A Formal Approach to the Extraction of Permittivity and Permeability of Isotropic and Anisotropic Media Using the TM 11 Mode in Rectangular Waveguides.

Based on our previous work on the propagation of electromagnetic waves in a layered medium placed in a rectangular waveguide, we present the theory of using the TE₁₀ and TM₁₁ modes to determine the complex parameters of isotropic and anisotropic media. The Nicolson–Ross–Weir method was used. The cases of isotropic, uniaxial, and biaxial materials were considered. It has been shown that the TM₁₁ mode can be used to extract parameters of non-magnetic uniaxial anisotropy media by a single measurement, without changing the sample position. This is not possible with the previously used TE₁₀ mode. It is also possible to use the TM₁₁ mode to quickly determine whether a material is isotropic or not. Experimental results are presented for some isotropic materials. [ABSTRACT FROM AUTHOR]