Patent ID: 7076382
Filing Date: 2006-07-11
Classification: G01R

Abstract:
1. Method of measuring the effective directivity of a test port of a system-calibrated vector network analyzer by the steps of: connecting a precision air line having an inlet and an outlet and short-circuited at the outlet; measuring complex reflection coefficients at the inlet of the precision air line at a sequence of measuring points within a prescribed frequency range; subjecting the sequence of the measured complex reflection coefficients to a discrete Fourier transformation to form a spectrum; filtering out the baseband from the spectrum; and obtaining a sequence of effective directivity values by subsequent inverse Fourier retransformation, wherein the precision air line has an impedance deviating from a system impedance of the network analyzer by a known value, the method comprising taking the known impedance deviation into account as appropriate correction values in determining the sequence of values of the effective directivity and/or effective source port match.