Method of measuring the effective directivity and/or residual system port impedance match of a system-calibrated vector network analyser

US7076382B2 · kind B2 · utility

Assignee

• Rohde & Schwarz GmbH & Co. KG · DE

Inventors

• Thomas Reichel · Heroldsbach, DE
• Harald Jaeger · Regensburg, DE

Key dates

• Filing date: Feb 20, 2003
• Grant date: Jul 11, 2006
• Expiry date: Feb 20, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R35/007
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To measure the effective directivity and/or the effective source port match of a test port of a system-calibrated vector network analyser, a precision air line short-circuited at the outlet is connected, and the complex reflection coefficient is measured at the inlet of this precision air line at a sequence of measuring points within a predefined frequency range. At the same time, for the effective directivity the sequence of the measured complex reflection coefficients is subjected to a discrete Fourier transformation and the baseband filtered out of the spectrum thereby formed. The sequence of effective directivity values is obtained by subsequent inverse Fourier retransformation.