Transmission wave modelling and calibration in cavity of open-ended rectangular waveguide

The accuracy of the open-ended waveguide technique for the determination of reflection coefficient of a sample is strongly affected by stray capacitance and conductance at the aperture end of the waveguide. The commercial waveguide calibration kit is quite expensive. In this paper, we apply phase extension technique for determination of reflection coefficient of a sample using a HP 8720 vector network analyzer where the sample reference plane did not coincide with the calibration plane.