Calibration and performance of an automatic microstrip six-port reflectometer

A six-port reflectometer based on three coupled equal-mode-impedance microstrip lines of improved design was automated. An efficient calibration algorithm which allows the explicit determination of the calibration constants was used. The observed long-term stability of these constants suggested thei...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1991-02, Vol.40 (1), p.51-54
Main Author: El-Deeb, N.A.
Format: Article
Language:English
Subjects:
Applied sciences
Automation
Calibration
Computer displays
Electronics
Exact sciences and technology
Interpolation
Iterative algorithms
Microstrip
Power measurement
Radio frequency
Stability
Testing, measurement, noise and reliability
Time measurement
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Summary:A six-port reflectometer based on three coupled equal-mode-impedance microstrip lines of improved design was automated. An efficient calibration algorithm which allows the explicit determination of the calibration constants was used. The observed long-term stability of these constants suggested their determination and storage at all frequencies of interest. This drastically reduced the measurement time. Interpolation between the selected calibration frequencies is discussed, and the corresponding performance of the reflectometer is illustrated. The six-port results based on linear interpolation are found to be generally better and faster to obtain than those based on curve fitting using a cubic spline. The overall accuracy and the frequency range of operation can be increased by using a controllable generator with a higher output power.< >
ISSN:0018-9456
1557-9662
DOI:10.1109/19.69954