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Six-port reflectometer circuit comprising three directional couplers

Six-port reflectometer circuit comprising three directional couplers

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© Controller HMSO
Published

A six-port reflectometer circuit, assembled from three directional couplers and covering a waveguide passband, is described. Experimental results obtained from a WG 22 wave-guide version show that about 1 mW source power is sufficient for thermistor detectors to be used with the circuit, a level obtainable from millimeter-wave solid-state sources.

Inspec keywords: directional couplers; microwave reflectometry

Other keywords: six-port reflectometer circuit; waveguide passband; thermistor detectors; WG 22 waveguide; millimetre-wave solid-state sources; directional couplers

Subjects: Microwave measurement techniques; Waveguide and microwave transmission line components

References

    1. 1)
      • G.F. Engen . Calibrating the six-port reflectometer by sliding terminations. IEEE Trans. , 951 - 957
    2. 2)
      • Orford, G.R., Abbott, N.P.: `Some recent measurements of linearity of thermistor power meters', 1981/49, IEE Colloquium Digest, p. 5/1–5/9.
    3. 3)
      • M.P. Weidman . A semiautomated six-port for measuring millimetre wave power and complex reflection coefficient. IEEE Trans. , 1083 - 1085
    4. 4)
      • H.P. Groll , W. Kohl . Six-port consisting of two directional couplers and two voltage probes for impedance measurement in the millimetre-wave range. IEEE Trans. , 386 - 390
    5. 5)
      • Birch, R.D., Collier, R.J.: `A broadband image guide directional coupler', Proc. 10th European Microwave Conference, 1980, Warsaw, p. 295–298.
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