Thermal Heating Contribution to Intermodulation Fields in Coaxial Waveguides

We investigate intermodulation (IM) production due to the thermal heating of coaxial waveguide walls. Two impressed signals are assumed to propagate in a coaxial cable in the TEM mode. The resulting power developed in the IM product is found to depend upon the thermal coefficient of the electrical conductivity of the metal squared, and is inversely proportional to the conductivity itself.