US3703689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave varactor-tuned resonator for preselector
Assignee: MICRODYNE CORP
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Filing: 1971-02-26
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Granted: 1972-11-21
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Expires: 1991-02-26
Abstract
Abstract A tunable varactor resonator has a high-Q cavity and a concentric inner probe, with one end of the concentric probe connected electrically to an eccentric probe of higher characteristic impedance in series with a varactor. Minimum insertion loss, approximately constant unloaded Q, and usability of low-Q varactor diodes are features.
Inventors
- 👤 Jon R Mcatee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:19
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
An electronically tuned resonator comprising a microwave resonator cavity element, a conductive probe concentrically positioned in said cavity element and forming therewith a high-Q shorted line resonating at somewhat higher frequency than that desired for operation, a conductive element eccentrically positioned in said cavity element and connected at one end to a point on said probe at an elevated RF potential, and a varactor diode in said cavity in series between the other end of said conductive element and a point on said probe of low RF potential; said conductive element forming with said cavity element a second shorted line resonating at a somewhat lower frequency than that desired for operation, and having a relatively lower Q, and a source of adjustable bias voltage connected to the varactor diode for adjusting the effective frequency of said resonator.
Claim 2
Dependent Claim
137 words
An electronically tuned resonator comprising a microwave resonator cavity element, a conductive probe concentrically positioned in said cavity element and forming therewith a high-Q shorted line resonating at somewhat higher frequency than that desired for operation, a conductive element eccentrically positioned in said cavity element and connected at one end to a point on said probe at an elevated RF potential, and a varactor diode in said cavity in series between the other end of said conductive element and a point on said probe of low RF potential; said conductive element forming with said cavity element a second shorted line resonating at a somewhat lower frequency than that desired for operation, and having a relatively lower Q, and a source of adjustable bias voltage connected to the varactor diode for adjusting the effective frequency of said resonator.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |