Patent US3969681A successfully refreshed from Google Patents.
US3969681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast electronic tuning of high power circuits for VHF-UHF power amplifier at high-efficiency
Assignee: United States Department of the Army
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Filing: 1974-08-15
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Granted: 1976-07-13
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Expires: 1994-08-15
Abstract
Abstract Two embodiments are disclosed of a system for the fast tuning of high power amplifier circuits. In one embodiment a strip line resonating circuit is selectively tuned by the actuation of selected ones of a plurality of PIN diodes which interconnect a relatively high impedance of strip line circuit with a strip line circuit having a lower characteristic impedance. In the second embodiment a coaxial cavity is terminated in an output transmission line. The cavity and the output transmission line are separated by an array of shorting stubs, each of which is selectively energizable by a suitably located PIN diode.
Inventors
- 👤 George Fincke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:01
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/602; H03F3/20; H03F3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A selectively tunable output circuit for an ultra-high frequency power amplifying device comprising: a tunable, coaxial, TEM mode cavity having cylindrical center and outer conductors; a triode amplifying device located within said center conductor of said tunable coaxial cavity, said triode having its grid connected to said outer conductor and its anode connected to said center conductor; at least six radially disposed, unequally spaced selectively positioned conductive tuning rods, capacitance coupled to said center conductor and insulated from and extending outward through said cylindrical outer conductor; a PIN diode at the outer end of each of said radial conductive rods, each diode arranged to short said radial rod to said outer conductor when said diodes are biased into the conductive state; and means to selectively bias said diodes to thereby change the tuning of said device.
Claim 2
Dependent Claim
136 words
A selectively tunable output circuit for an ultra-high frequency power amplifying device comprising: a tunable, coaxial, TEM mode cavity having cylindrical center and outer conductors; a triode amplifying device located within said center conductor of said tunable coaxial cavity, said triode having its grid connected to said outer conductor and its anode connected to said center conductor; at least six radially disposed, unequally spaced selectively positioned conductive tuning rods, capacitance coupled to said center conductor and insulated from and extending outward through said cylindrical outer conductor; a PIN diode at the outer end of each of said radial conductive rods, each diode arranged to short said radial rod to said outer conductor when said diodes are biased into the conductive state; and means to selectively bias said diodes to thereby change the tuning of said device.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |