Millimetre-wave vector measurements using multistate reflectometers with diode detectors

The use of diode power detection with millimeter-wave multistate reflectometers is described. The nonlinear behavior of the diodes has been linearized, and comparisons with thermistor-based systems show that high-quality vector measurements are produced at Q-band and 94.9 GHz with a significant improvement in measurement speed. The use of a scalar network analyzer and diode detectors to make vector measurements has been demonstrated at W-band, requiring a controlling computer and some waveguide hardware. This would enable swept measurements to be made at a rate of one sweep every 2-3 s. The system works in any waveguide band for which the necessary hardware is available.<>