Millimeter-wave sweep oscillator and insertion and reflection loss meter

The development of the millimeter-wave sweep oscillator and the millimeter-wave insertion and reflection loss meter which was used for construction and maintenance of the W-40G transmission system has been completed. This measuring equipment was accomplished by means of the millimeter-wave solid-state technology which was originally developed in the ECL. The sweep oscillator employs IMPATT diodes and is capable of being bias-tuned over 8 GHz between 40 GHz and 90 GHz. More than 1 dBm output power and greater than 40 dB spurious response D/U are obtained. By use of n-GaAs Schottky barrier diodes and other wideband and low VSWR waveguide components, the insertion and reflection loss meter can measure over 40 dB losses. Its minimum distinguishable loss is 0.1 dB. This paper describes the design and performance of this millimeter-wave measuring equipment. Satisfactory performances have already been confirmed in field trials.