Microwave oscillator injection locked at its fundamental frequen

Oscillators – With distributed parameter resonator

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331107C, 331107DP, 331172, H03B 914, H03B 714

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active

045688907

ABSTRACT:
A microwave oscillator suitable for millimeter wavelengths comprises a Gunn diode (3) coupled to a waveguide (1) by a resonant-cap structure (5,6). The diode (3) generates microwave energy both at a fundamental frequency f.sub.o which is below the cut-off frequency of the waveguide (1) and at a second harmonic frequency 2f.sub.o above cut-off. To control the generation of microwave energy at 2f.sub.o, energy at f.sub.o is coupled into the waveguide (1) from an adjacent further waveguide (9) above its cut-off, by means of an electric probe (8) extending close to the cap (5). The probe (8) may couple in a locking signal at or close to the free-running value of f.sub.o from another oscillator having better noise performance and electronic tuning, thereby locking 2f.sub.o to twice the frequency of the locking signal, or alternatively may couple to a varactor-tuned cavity resonant at f.sub.o.

REFERENCES:
patent: 3713041 (1973-01-01), Sakamoto et al.
patent: 4222014 (1980-09-01), Ondria
patent: 4264875 (1981-04-01), Hunsperger et al.
Lazarus et al., "Wideband Tunable MM-Wave Gunn Oscillator Design", Electronic Letters, Oct. 1, 1981, vol. 17, No. 20, pp. 739-741.
Oltman et al., "Subharmonically Injection Phase-Locked Gunn Oscillator Experiments", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-17, Sep. 1969, pp. 728-729.
Chien et al., "Subharmonically Injected Phase-Locked IMPATT-Oscillator Experiments", Electronics Letters, vol. 6, No. 8, Apr. 16, 1970, pp. 240-241.
Barth, "A Wideband, Backshort-Tunable Second Harmonic W-Band Gunn-Oscillator", 1981 IEEE MTT-S, International Microwave Symposium Digest, Los Angeles, CA, Jun. 15-19, 1981, pp. 334-337.

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