Calibration of vector circuit analyzers in coaxial channels with a metric screw thread

Methods of determining the scattering parameters of coaxial inch-to-metric thread transitions by the movable load method are considered. It is shown that the parameters of the transitions can be established as analytical functions of the frequency using an air line, a short-circuiting device and an unknown matched load in several frequency windows (subbands) with an error no worse than that of traditional calibration methods.