A Technique for Extending the Dynamic Range of the Dual Six-Port Network Analyzer

The dynamic range of the six-port type of automatic network analyzer is typically limited to measuring two-port devices with a transmission coefficient S/sub 12/ in the range of 0 to -60 dB. The following describes a subcarrier approach for extending the dynamic range of the dual six-port network an...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1985-06, Vol.33 (6), p.453-459
Main Authors: Juroshek, J.R., Hoer, C.A.
Format: Article
Language:English
Subjects:
Detectors
Dynamic range
Electrical and electronic components, instruments and techniques
Equations
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Phase measurement
Phase shifters
Physics
Position measurement
Reflection
Schottky diodes
Testing
Thermistors
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Summary:The dynamic range of the six-port type of automatic network analyzer is typically limited to measuring two-port devices with a transmission coefficient S/sub 12/ in the range of 0 to -60 dB. The following describes a subcarrier approach for extending the dynamic range of the dual six-port network analyzer. The subcarrier is generated by inserting a 10-kHz, biphase modulator ahead of one of the six-ports. With the subcarrier approach, measurements of S/sub 12/ in the range of -60 to -100 dB can be made. Test results are presented showing measurements of S/sub 12/ =-80 db with a precision of +-0.05 dB or better, and an accuracy of +-0.16 dB or better at 3 GHz. Measurement results are also presented showing the dynamic range achievable with thermistor and barretter detectors. Key Words: barretter power detectors; diode power detectors; impedance measurements; microwave network analyze; six-port network analyze; thermistor power detectors.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.1985.1133099