Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1985-01-15
1987-07-14
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 58A, 324 58B, G01R 2704
Patent
active
046805389
ABSTRACT:
A vector network analyzer system for measuring the complex impedance of devices and components at millimeter wavelengths is disclosed. A pair of directional couplers provide samples of the signal incident on and reflected from the element under test through reference and test channels, respectively. A 180.degree. hybrid, or magic tee, device receives the samples, mixes them vectorially, and produces outputs to two power detectors which provide amplitude and phase information about the complex reflection coefficient. Similar measurements are obtained for the complex transmission coefficient. A 90.degree. phase shifter consisting of a second magic tee and a PIN diode is connected in the reference channel to eliminate a phase measurement ambiguity. A computer processes the power detector output to determine the value of the unknown impedence. An electronically swept signal source allows measurements to be made automatically over a wide frequency band.
REFERENCES:
HP: "Automatic Network Analyzer" hp8542A, Section IV--pp. 2 and 3--(circa 1976).
Engen, Glenn F., "An Improved Circuit for Implementing the Six-Port Technique of Microwave Measurements," IEE Transactions on Microwave Theory and Techniques, V. MIT-25, No. 12, Dec. 1977, pp. 1080-1083.
Weidman, Manly P., "A Semiautomated Six Port for Measuring Millimeter-Wave Power and Complex Reflection Coefficient," IEE Transactions on Microwave Theory and Techniques, V. MIT-25, Dec. 1977, pp. 1083-1085.
Cronson, et al., Harry M., "A Six-Port Automatic Network Analyzer," IEE Transactions on Microwave Theory and Techniques, V. MIT-25, No. 12, Dec. 1977, pp. 1086-1091.
Engen, Glenn F., "Calibrating the Six-Port Reflectometer by Means of Sliding Terminations," IEEE Transactions on Microwave Theory and Techniques, V. MIT-26, No. 12, Dec. 1978, pp. 951-957.
Somlo, et al., P. I., "A Six-Port Reflectometer and Its Complete Characterization by Convenient Calibration Procedures," IEE Transactions on Microwave Theory and Techniques, V. MIT-30, No. 2, Feb. 1982, pp. 186-192.
Paul, Jeffrey A., "Wideband Millimeter-Wave Impedance Measurements," Apr. 1983, pp. 95-102, Microwave Journal.
Dalman G. Conrad
Kondoh Hiroshi
Cornell Research Foundation Inc.
Eisenzopf Reinhard J.
Solis Jose M.
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