Reflectometer calibration without an open circuit

This paper presents a convenient calibration technique of a six-port reflectometer requiring a set of loads including two standards and avoiding the use of an open circuit This method has been applied for different reflectometers at three frequencies: 2, 33, and 94 GHz. Reflection coefficient measurement results obtained by this method and other calibration techniques prove its efficiency. Transmission coefficient measurement has also been performed at 94 GHz. Characterizations of some coaxial components by the heterodyne network analyzer using this technique and other calibration methods are presented at frequencies between 0.5 and 10 GHz.