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An automatic standing-wave indicator for the 3-cm waveband

An automatic standing-wave indicator for the 3-cm waveband

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The equipment is based on the rotary type of standing-wave indicator, the mechanical rotation of the detector being replaced by a ferrite polarization-rotating section and a fixed detector. The v.s.w.r. information is extracted from the output signal and fed to a meter calibrated directly in v.s.w.r. and/or reflection coefficient. Advantages over other similar equipment are that there are no rapidly moving parts liable to wear, it does not rely on similarity of crystal characteristics, and the response at any one frequency is effectively instantaneous. The indicator can be used as a second grade microwave bench, for testing microwave systems and as production testing equipment for microwave components.

References

    1. 1)
      • Ring-shaped waveguide measuring section with automatic display
    2. 2)
      • Measuring microwave impedance with the reflectometer
    3. 3)
      • Automatic plotter for wave-guide impedance
    4. 4)
      • Instruments for use in the Microwave band
    5. 5)
      • An automatic swept-frequency impedance meter
    6. 6)
      • A microwave swept-frequency impedance meter
    7. 7)
      • J. A. C. Kinnear, Unpublished work by Elliott Brothers (London), Ltd.
    8. 8)
      • , The Microwave Megamatch
    9. 9)
      • Vinding, Jorgen P.: `The Z scope, an automatic impedance plotter', Convention Record of the I.R.E., 1956, Microwaves and Instrumentation, p. 178, Part 5
    10. 10)
      • Impedance measurement by means of a broadband circular-polarization coupler
    11. 11)
      • Measurement of Standing Waves, Principles of Microwave Circuits
    12. 12)
      • Three-probe method of impedance measurement
    13. 13)
      • Two automatic impedance plotters
    14. 14)
      • 592,224, 11 September 1947, British Patent Specification
    15. 15)
      • , Antennas
    16. 16)
      • S.B. Cohn, loc. cit., p. 1555
    17. 17)
      • J. Welsh, “Effect of a d.c. bias on crystal sensitivity.” Unpublished work by Elliott Brothers (London), Ltd.
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