Measurement of electromagnetic properties of materials using transmission/reflection method in coaxial line

Transmission/reflection frequency-domain measurements to determine the electromagnetic properties of solid materials in a coaxial line are introduced in this essay. The method can determine both the complex relative permittivity (/spl epsiv//sub r/) and permeability (/spl mu//sub r/) simultaneously. A few problems such as half-wavelength divergence, phase jump, multiplicity of roots etc. have been discussed. As sample materials, the derived /spl epsiv//sub r/ and /spl mu//sub r/ of teflon and some absorbers are given and the accuracy of the test system is described. The advantage of this system is to determine the electromagnetic properties of absorptive materials.