Resonant microwave measurement of the electric conductivity of wires

A rapidly increasing need for high-speed cable assemblies prompts the need for microwave characterization of wires at frequencies well beyond a few GHz. Therefore, the resonant method based on a cylindrical cavity resonator is presented in this paper, which allows measuring electric conductivity of wires with the diameter less than 1 mm at frequencies spanning from 20 to 40 GHz. The concept of the measurement altogether with the error analysis is addressed and practical limitations of the method are discussed.