Patent US3704429A successfully refreshed from Google Patents.
US3704429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative resistance diode coaxial cavity oscillator with resistor for suppressing undesired modes
Assignee: Unisys Corp
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Filing: 1970-06-19
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Granted: 1972-11-28
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Expires: 1990-06-19
Abstract
Abstract A negative resistance diode device is coupled to oscillating high frequency fields within a coaxial line cavity resonator for amplifying those electromagnetic fields. The combination forms a single port, high frequency amplifier or oscillator. A resistive device is coupled within the inner conductor of the coaxial resonator for supplying bias to the negative resistance diode device, for eliminating spurious modes of high frequency oscillation in the resonator, and for facilitating electronic tuning of the operating high frequency of the converter.
Inventors
- 👤 Bernard E Sigmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:18
CPC Classifications
H; H03; H03B; H03B7/00; H03B7/12; H03B7/14; H03B7/143
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A high frequency energy converter comprising: cavity resonator means having opposed interior surface means closing said cavity resonator means and adapted to conduct high frequency currents, series high frequency current conducting means conductively connected between said opposed interior surface means comprising: negative resistance semiconductor diode means, first conductor means, resistor means having at least one electrical lead means, and hollow conductor means extending through one of said opposed interior surface means and out of said cavity resonator means for support of said electrical lead means in insulated relation therein, said negative resistance diode means, said first conductor means, said resistor means, and said electrical lead means providing means for flow of current for biasing said negative resistance diode means, and transmission line means coupled within said cavity resonator means in high frequency energy exchange relation therewith.
Claim 2
Dependent Claim
136 words
A high frequency energy converter comprising: cavity resonator means having opposed interior surface means closing said cavity resonator means and adapted to conduct high frequency currents, series high frequency current conducting means conductively connected between said opposed interior surface means comprising: negative resistance semiconductor diode means, first conductor means, resistor means having at least one electrical lead means, and hollow conductor means extending through one of said opposed interior surface means and out of said cavity resonator means for support of said electrical lead means in insulated relation therein, said negative resistance diode means, said first conductor means, said resistor means, and said electrical lead means providing means for flow of current for biasing said negative resistance diode means, and transmission line means coupled within said cavity resonator means in high frequency energy exchange relation therewith.
Claim 3
Dependent Claim
65 words
Apparatus as described in claim 1 wherein: said first and hollow conductor means have opposed separated faces forming gap means therebetwEen for locating said resistor means, said gap means and said resistor means being located relative to the oscillating electric field of a desired cavity mode so as to form a resistive current path for high frequency currents only of undesired modes between said faces.
Claim 4
Dependent Claim
36 words
Apparatus as described in claim 2 wherein said gap means and said resistor means are located in a region of maximum oscillating radial electric field for a desired mode of oscillation within said cavity resonator means.
Claim 5
Dependent Claim
75 words
Apparatus as described in claim 1 additionally comprising; variable capacitor means exterior of said cavity resonator means, means for coupling a control signal to said variable capacitor means, and means for coupling said variable capacitor means to said hollow conductor means within the interior of said cavity resonator means for forming tuning means for said cavity resonator means, the current paths for said tuning means and for said bias current flow means being mutually independent.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |