US3755758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital tuned microwave oscillator
Assignee: California Microwave Inc
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Filing: 1971-10-04
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Granted: 1973-08-28
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Expires: 1991-10-04
Abstract
Abstract A high stability digitally tuned L-band cavity oscillator employs PIN diode switching of the cavity resonant frequency to provide an output signal at any one of 16 discrete frequencies under the control of a four-wire digital input. An analog input is added to adjust the center-line frequency over a bandwidth at least as wide as the least significant incremental step to further provide for AFC and phase lock capability. A half-wave resonator cavity is used with a quarter-wave member notched at intervals along its length. A switching diode adapted to be coupled to a source of digital signals is coupled across each notch to digitally control the electrical characteristics of the resonator and its output frequency. A varactor provides the analog and fine tuning control.
Inventors
- 👤 D Leeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:49
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1841; H03B2200/00; H03B2200/003; H03B2200/0056; H03B2201/00; H03B2201/02; H03B2201/0208; H03B2201/025; H03B2201/0258
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
A microwave oscillator comprising: a frequency-determining microwave-resonant electrically conductive member for conducting current at the output oscillation frequency; a first freQuency control means coupled in parallel with a first portion of said member and selectively operable for shunting a portion of said current past said first portion of said member for providing a first discrete change in said output frequency; a second frequency control means coupled in parallel with a second portion of said electrically-conductive member and selectively operable for shunting a portion of said current past said second portion of said member for providing a second discrete change in said output frequency the magnitude of which is substantially independent of the operation of said first frequency control means; and means for applying control signals to said first and said second frequency control means for selectively operating said first and said second frequency control means separately and in combination for selectively providing said first discrete change in said output frequency when only said first frequency control means is operated, said second discrete change in said output frequency when only said second frequency control means is operated and a third discrete change in said output frequency which is substantially equal to the sum of said first and said second discrete changes in said output frequency when both said first and said second frequency control means aare operated simultaneously.
Claim 2
Dependent Claim
227 words
A microwave oscillator comprising: a frequency-determining microwave-resonant electrically conductive member for conducting current at the output oscillation frequency; a first freQuency control means coupled in parallel with a first portion of said member and selectively operable for shunting a portion of said current past said first portion of said member for providing a first discrete change in said output frequency; a second frequency control means coupled in parallel with a second portion of said electrically-conductive member and selectively operable for shunting a portion of said current past said second portion of said member for providing a second discrete change in said output frequency the magnitude of which is substantially independent of the operation of said first frequency control means; and means for applying control signals to said first and said second frequency control means for selectively operating said first and said second frequency control means separately and in combination for selectively providing said first discrete change in said output frequency when only said first frequency control means is operated, said second discrete change in said output frequency when only said second frequency control means is operated and a third discrete change in said output frequency which is substantially equal to the sum of said first and said second discrete changes in said output frequency when both said first and said second frequency control means aare operated simultaneously.
Claim 3
Dependent Claim
29 words
A microwave oscillator according to claim 1 further comprising means coupled to said electrically conductive member for adjusting the output frequency of said oscillator continuously over a predetermined range.
Claim 4
Dependent Claim
17 words
A microwave oscillator according to claim 2 wherein said adjusting means comprises voltage controlled variable capacitive means.
Claim 5
Dependent Claim
18 words
A microwave oscillator according to claim 3 wherein said electrically conductive member is effectively one quarter-wave length long.
Claim 6
Dependent Claim
47 words
A microwave oscillator according to claim 1 wherein said first and second portions of said conductive member each have a notch formed therein and wherein said first and second frequency control means comprises a first binary element and a second binary element respectively coupled across said notches.
Claim 7
Dependent Claim
69 words
A microwave oscillator according to claim 1 further comprising a first reactive circuit element coupled in series with a first diode and a second reactive circuit element coupled in series with a second diode and wherein said control signal applying means is coupled between said first diode and said first capacitor and between said second diode and said second capacitor for selectively switching said first and said second diodes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |