Measurement of Electromagnetic Property Parameters of Penetrable Materials Based on Partially-Filled Waveguide

An experimental device based on a rectangular waveguide is proposed to measure electromagnetic (EM) property parameters of lossy penetrable materials. The frequency band of measurement is 8.2 – 12.5 GHz and the parameters like effective dielectric constant and loss tangent can be measured through a mode-matching method and numerical analysis with a partially-filled waveguide. With the obtained mode and field distribution in the filled materials, the EM property parameters of the material can be inverted. Measurement simulations for typical materials show that the designed device can effectively measure the EM property parameters of penetrable materials and the measurement error of 0.2% can be achieved.