The Screening Potential Theory of Excess Conduction Loss at Millimeter and Submillimeter Wavelengths

On using the screening potential theory, the room-temperature excess conduction Ioss in copper waveguide is explained and calcuIated. The low-frequency and long-wavelength conductivity with spatial dispersion has been shown to give 30-percent more conduction loss in copper at submillimeter-wave frequency. Good agreement between experimental and theoretical results is obtained.