Measurement of Surface Resistance in Oversized Circular Waveguide at Millimeter Wavelengths (Short Papers)

The increase of the surface resistance of oversized circular waveguides has been accurately evaluated at millimeter wavelengths by measuring attenuations of TE/sub 0n/ modes. The ratios of the effective resistances to the ideal resistances of the wall were found to be 1.27, 1.42, and 1.54 at 40, 60, and 80 GHz, respectively.