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Reference phase-shifter for measuring high power microwave impedance by using a phase modulation method.

H Chaabane1, B Dichtel, G Roussy

  • 1Laboratoire de Spectroscopie et des Techniques Microondes, Université Henri Poincaré, Nancy, France.

The Journal of Microwave Power and Electromagnetic Energy : a Publication of the International Microwave Power Institute
|July 15, 2003
PubMed
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A novel mechanical phase-shifter using a curved waveguide and stepper motor is introduced for reliable impedance measurements. This gearless design offers stable performance even with unstable signal generators in industrial settings.

Area of Science:

  • Electrical Engineering
  • Mechanical Engineering
  • Physics

Background:

  • Accurate impedance measurements are crucial in various industrial applications.
  • Existing phase modulation methods often require highly stable signal generators.
  • A need exists for robust phase-shifting components compatible with less stable industrial equipment.

Purpose of the Study:

  • To propose and describe a basic mechanical phase-shifter for impedance measurements.
  • To provide a reference circuit for phase modulation techniques.
  • To demonstrate its utility with unstable signal generators.

Main Methods:

  • A mechanical phase-shifter was designed using a section of curved rectangular waveguide.
  • The waveguide's length is varied mechanically using a stepper motor.

Related Experiment Videos

  • The design avoids the use of gears for length adjustment.

    • Main Results:

    • The developed phase-shifter functions effectively without gears.
    • It provides a stable reference for impedance measurements.
    • Successful operation was demonstrated with pulsed or continuous wave (CW) generators exhibiting low frequency and amplitude stability.

    Conclusions:

    • The proposed mechanical phase-shifter is a viable and robust solution for impedance measurements.
    • Its design is suitable for industrial environments, particularly those with less stable signal sources.
    • This component enhances the reliability of phase modulation methods in practical applications.