Patent US3851271A successfully refreshed from Google Patents.
US3851271A
Expired / Lapsed
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Broad band injection-tuned gunn diode microwave oscillator
Assignee: International Standard Electric Corp
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Filing: 1973-08-23
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Granted: 1974-11-26
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Expires: 1993-08-23
Abstract
Abstract This relates to a broadband injection-tuned Gunn diode microwave oscillator module. The module includes a Gunn diode and a microwave resonant cavity. The resonant cavity is a multi-tuned circuit to present the Gunn diode with its negative impedance over the requisite frequency band. The cavity is an evanescent mode waveguide. Tuning is accomplished solely by an injection locking signal which modifies the impedance of the cavity to match the Gunn diode over the requisite frequency band. This type of tuning eliminates the need for either electronic tuning of the Gunn diode and/or mechanical tuning of the cavity.
Inventors
- 👤 R Cooke
- 👤 R Conlon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:33
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/145; H03B2200/00; H03B2200/006; H03B2200/0074; H03B2201/00; H03B2201/01; H03B2201/014; H03B2201/015
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A microwave oscillator arrangement with wideband frequency control comprising: a multituned microwave resonant circuit; a two terminal solid state microwave oscillator device disposed in said resonant circuit; and a frequency controlling injection locking oscillator coupled to said resonant circuit, said locking oscillator having an injection locking output signal which modifies the impedance of said resonant circuit so that over a required frequency band said oscillator device is presented with the negative of its impedance; said resonant circuit having a given resonant frequency and a counter-clockwise Smith chart admittance locus with increasing frequency approximating the Smith chart admittance locus of said oscillator device; and said injection locking output signal modifies the admittance of said resonant circuit to add capacitance to said resonant circuit below said resonant frequency of said resonant circuit and to add inductance to said resonant circuit above said resonant frequency of said resonant circuit to enable achievement of said wideband frequency control.
Claim 2
Dependent Claim
154 words
A microwave oscillator arrangement with wideband frequency control comprising: a multituned microwave resonant circuit; a two terminal solid state microwave oscillator device disposed in said resonant circuit; and a frequency controlling injection locking oscillator coupled to said resonant circuit, said locking oscillator having an injection locking output signal which modifies the impedance of said resonant circuit so that over a required frequency band said oscillator device is presented with the negative of its impedance; said resonant circuit having a given resonant frequency and a counter-clockwise Smith chart admittance locus with increasing frequency approximating the Smith chart admittance locus of said oscillator device; and said injection locking output signal modifies the admittance of said resonant circuit to add capacitance to said resonant circuit below said resonant frequency of said resonant circuit and to add inductance to said resonant circuit above said resonant frequency of said resonant circuit to enable achievement of said wideband frequency control.
Claim 3
Dependent Claim
14 words
An arrangement according to claim 1, wherein said oscillator device is a Gunn diode.
Claim 4
Dependent Claim
17 words
An arrangement according to claim 1, wherein said resonant circuit includes an evanescent mode waveguide resonant cavity.
Claim 5
Dependent Claim
14 words
An arrangement according to claim 3, wherein said oscillator device is a Gunn diode.
References Cited (Backward Citations)
US3737804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |