Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Reference Phase-Shifter for Measuring High-Power Microwave Impedance by Using a Phase Modulation Method [PDF]
AUTHORS	H. Chaabane, B. Dichtel and G. Roussy 2002 37 4 207-213
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Abstract A basic mechanical phase-shifter is described and proposed for use as a reference circuit for impedance measurements with a phase modulation method. It consists of a section of a curved rectangular waveguide, the length of which is mechanically varied with a stepper motor. The phase-shifter functions without gears. It can be used successfully in industrial set-ups with a pulsed or CW generator which are of low stability in frequency and in amplitude. Key words : Stable phase-shifter, phase modulation technique, complex reflection measurement, microwave high power measurement