Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Calibration
Patent
1996-08-01
1998-05-05
Karlsen, Ernest F.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Calibration
324638, G01R 2704
Patent
active
057480001
ABSTRACT:
An error correction method reduces transmission measurement errors and improves measurement accuracy of vector network analyzers. A reflection measurement made using a thruline standard connected between a source port and load port of a transmission/reflection (T/R) test set characterizes the impedance match of the load port while a reflection calibration characterizes the source port. The source port characterization and the load port characterization are then processed to correct a transmission tracking error in subsequent transmission measurements made on a device under test (DUT), without impacting the measurement speed of the VNA. A reflection measurement made with the DUT connected between the source and load port provides a measurement of the DUT's input reflection coefficient, including the effect of the impedance mismatch of the load port. This reflection measurement and the source port characterization are processed to correct a DUT input mismatch error. Correction of the transmission tracking error or the DUT input mismatch error improves the accuracy of transmission measurements made by the VNA.
REFERENCES:
patent: 4816767 (1989-03-01), Cannon
patent: 4845423 (1989-07-01), Pollard
Ferrero et al; "Two-Port Network Analyzer Calibration Using an Unknown TRU." IEEE MW Letters--Dec. 1992.
Franzen et al; "A New Procedure for System Calibration . . . " 5th European Microwave Conference--Sep. 1975.
Hewlett--Packard Company
Imperato John L.
Karlsen Ernest F.
Solis Jose M.
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