Injection-locked waveguide oscillator

Details Injection-locked waveguide oscillator Injection-locked waveguide oscillator

1986-03-10

1987-02-10

Grimm, Siegfried H.

Oscillators

Plural oscillators

Oscillator used to vary amplitude or frequency of another...

331 54, 331 55, 331 56, 331 96, 331107P, 331172, H03B 714, H03B 914

Patent

active

046425772

ABSTRACT:
An injection-locked waveguide oscillator comprises a first diode (3) having a free-running fundamental frequency above the local cut-off frequency of the waveguide (1) and a second diode (4) having a fundamental frequency below and a higher harmonic above the local cut-off frequency. The first diode (3) may be an IMPATT diode and the second diode (4) a Gunn diode. The free-running fundamental frequency of the first diode (3) is close to the higher harmonic of the second diode (4) so that the second diode (4) injection-locks the first (3). Locking in the reverse sense is inhibited by the inherent loss in conversion from the higher harmonic to the fundamental in the second diode (4), thus avoiding the need for a circulator or isolator. The two diodes (3, 4) preferably are mounted in a common waveguide (1) for a simple compact structure.

REFERENCES:
patent: 4568890 (1986-02-01), Bates
Perlman et al., "Criterion for Nonreciprocal Injection Locking of Bilateral Microwave Oscillators", IEEE Trans. Microwave Theory and Techniques, vol. MTT-18, No. 8, Aug. 1970, pp. 507-508.
Talwar, "A Dual-Diode 73-GHz Gunn Oscillator", IEEE Trans. Microwave Theory and Techniques, vol. MTT-27, No. 5, May 1979, pp. 510-512.

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