RF interferometer

Details RF interferometer RF interferometer

1986-09-29

1988-07-19

Pellinen, A. D.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 585B, G01R 2706

Patent

active

047587768

ABSTRACT:
An RF interferometer is provided in which a power source is connected via first and second directional couplers to a load or device under test. The second coupler is connected to a second detector sampling power incident on the load. The first coupler is connected to a first detector arranged to detect power arising from vector combinations of source voltage and load-reflected voltage. The first coupler is also connected to a three position switch disposed to present any one of three reflecting arrangements to coupled source power. The reflecting arrangements consist of a short-circuited first waveguide, an open circuited second waveguide and a directional coupler having two ports remote from the switch connected together by a third waveguide. Operation of the switch furnishes three different vector combinations of source and load-reflected voltage for measurement by the first detector. This is equivalent to the result achieved by a six-port reflectometer, but with reduced dependence on the frequency stability of components.

REFERENCES:
patent: 4427936 (1984-01-01), Riblet et al.
patent: 4489271 (1984-12-01), Riblet
patent: 4571545 (1986-02-01), Griffin et al.
Oldfield et al., "A Multistate Reflectometer", IEEE Transaction on Instrumentation and Measurement, vol. IM-34, No. 2, Jun. 1985, pp. 198-201.
Hoer, Cletus A., "A Network Analyzer Incorporating Two Six-Port Reflectometers", IEEE Transaction on Microwave Theory and Techniques, vol. MTT-25, No. 12, Dec. 1977, pp. 1070-1074.
Weidman, Manley P., "A Semiautomated Six Port for Measuring Millimeter-Wave Power and Complex Reflection Coefficient", IEEE Transaction on Microwave Theory and Techiques, vol. MTT-25, No. 12, Dec. 1977, pp. 1083-1085.
Skilton, P. J., "A Reflectometer and Power-Ratio Technique for the Measurement of Low Values of Waveguide Attenuation", IEEE Transaction on Instrumentation and Measurement, vol. IM-25, No. 4, Dec. 1976, pp. 307-311.
Crandell et al., "Reflectometers for Millimeter-Wave Measurements", Microwave Journal, (U.S.A.), vol. 23, No. 6, pp. 60-63.

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