Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985itmtt..33..610c&link_type=abstract
IEEE Transactions on Microwave Theory and Techniques (ISSN 0018-9480), vol. MTT-33, July 1985, p. 610-619.
Astronomy and Astrophysics
Astronomy
23
Gunn Diodes, Harmonic Oscillators, Millimeter Waves, Phase Locked Systems, Radio Astronomy, Gallium Arsenides, Tuning, Waveguides
Scientific paper
A phase-locked second harmonic Gunn oscillator, mechanically tunable from 65 to 115 GHz, has been developed for use as a local oscillator in millimeter radio astronomy. The oscillator's output power is greater than 2 mW over most of its operating range, and exceeds 10 mW from 80 to 102 GHz. Its frequency can be electronically tuned approximately + or - 200 MHz by varying the bias voltage on the Gunn diode; it is phase-locked by exploiting this bias tuning. The oscillator consists of a commercially available, packaged GaAs Gunn diode which is mounted in a coaxial resonator of adjustable length. Descriptions of the mechanical design and phase-lock circuit are given. Extensive experimental measurements of the tuning range and power output for oscillators with different resonator dimensions also are reported.
Carlstrom John E.
Plambeck Richard L.
Thornton Douglas
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