METHOD FOR MEASURING THE RESIDUAL SYSTEM DIRECTIVITY AND/OR THE RESIDUAL SYSTEM PORT IMPEDANCE MATCH OF A SYSTEM-CALIBRATED VECTOR NETWORK ANALYSER

摘要

The invention relates to a method for measuring the residual system directivity and/or the residual system port impedance match of a measuring port (M) of a system-calibrated vector network analyser (N). According to said method, an output short-circuited precision air line (L) is connected and the complex reflection coefficient at the input of said precision air line (L) is measured at a series of measuring points within a predefined frequency range. To obtain the residual system directivity, the series of measured complex reflection coefficients is subjected to a discrete Fourier transform and the base band is filtered out of the spectrum that has been formed. The series of residual system directivity values is obtained by a subsequent inverse Fourier transform.