Patent US3760219A successfully refreshed from Google Patents.
US3760219A
Expired / Lapsed
US
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Traveling wave device providing prebunched transverse-wave beam
Assignee: United States Department of the Army
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Filing: 1972-04-25
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Granted: 1973-09-18
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Expires: 1992-04-25
Abstract
Abstract A traveling wave tube having a control grid that backs and fills across the entire cathode emitting surface to form a delay line with the cathode. This delay line causes the electron beam to take on the helical pattern of a transverse wave. The traveling wave tube has a slow wave circuit which interacts with the transverse beam wave. Circuit means is provided for coupling signal energy to both the control grid and to the slow wave interaction circuit in a predetermined amplitude and phase relationship. The control grid is operated with DC cutoff bias. Each peak of the signal propagated by the grid-cathode delay line annuls the cutoff bias locally and forms a moving window, analogous to a moving window of a focal plane shutter, emitting an electron beam only from a local area of the cathode, which local area cyclically traverses the cathode at the signal frequency whereby the emitted beam is properly prebunched in a helical configuration for efficient transverse wave interaction.
Inventors
- 👤 Santis C De
- 👤 A Gottfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:13
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
An improved traveling wave device comprising: longitudinal slow wave means, means for providing a magnetic field longitudinally of said slow wave means, a collector adjacent one end of said slow wave means, an electron gun adjacent the other end of said slow wave means, said electron gun including a cathode having an Emitting surface and a grid that together form a delay line, said grid being disposed adjacent the emitting surface and backing and filling across the entire emitting surface and operable in response to a combination of cutoff bias and superposed signal energy propagated by the delay line with peaks for annulling the cutoff bias to emit only from a moving local area that traverses the cathode cyclically, for emitting a prebunched electron beam for transverse wave interactions along the slow wave means, and means for coupling signal energy from a common source to the electron gun and to the slow wave means.
Claim 2
Dependent Claim
154 words
An improved traveling wave device comprising: longitudinal slow wave means, means for providing a magnetic field longitudinally of said slow wave means, a collector adjacent one end of said slow wave means, an electron gun adjacent the other end of said slow wave means, said electron gun including a cathode having an Emitting surface and a grid that together form a delay line, said grid being disposed adjacent the emitting surface and backing and filling across the entire emitting surface and operable in response to a combination of cutoff bias and superposed signal energy propagated by the delay line with peaks for annulling the cutoff bias to emit only from a moving local area that traverses the cathode cyclically, for emitting a prebunched electron beam for transverse wave interactions along the slow wave means, and means for coupling signal energy from a common source to the electron gun and to the slow wave means.
Claim 3
Dependent Claim
39 words
An improved traveling wave device as defined in claim 1 wherein said signal energy coupling means includes phase control means for adjusting the relative phase of signal energy coupled to the electron gun and to the slow wave means.
Claim 4
Dependent Claim
34 words
In the improved traveling wave device as defined in claim 1 wherein said slow wave means is a wire conductor in the form of a helix, and the cathode has an annular emitting surface.
Claim 5
Dependent Claim
21 words
In the improved traveling-wave device defined in claim 1 wherein the control grid is in the form of a meander line.
Claim 6
Dependent Claim
56 words
In the improved traveling wave device defined in claim 1 wherein the electron gun includes said cathode, said grid and an anode that are coaxial cylindrical structures and wherein the cathode has a cylindrical emitting surface directed toward the anode and the grid backs and fills across the cylindrical cathode emitting surface all around the cathode.
Claim 7
Dependent Claim
62 words
An improved traveling-wave device as defined in claim 1 wherein the device has a longitudinal interaction region along said slow wave means and the cathode has a linear emitting surface parallel to and also oblique to the axis whereby electron emission is directed obliquely to the axis, and the grid backs and fills across the entire length of the linear emitting surface.
Claim 8
Independent Claim
115 words
A method of operating a traveling wave tube having slow wave means, electron beam emission means and a beam collector comprising the steps of: energizing said electron beam emission means while applying cutoff bias thereto: coupling selected signal energy to be amplified to the slow wave means, wave means to the electron beam emission means for causing the latter to annulling the cutoff bias in a moving local area only, of the electron beam emission means, which local area retraces its path cyclically with the same period as the signal, to emit a prebunched electron beam for transverse wave interaction prior to entry of the beam into the interaction region within said slow wave means.
Claim 9
Independent Claim
115 words
A method of operating a traveling wave tube having slow wave means, electron beam emission means and a beam collector comprising the steps of: energizing said electron beam emission means while applying cutoff bias thereto: coupling selected signal energy to be amplified to the slow wave means, wave means to the electron beam emission means for causing the latter to annulling the cutoff bias in a moving local area only, of the electron beam emission means, which local area retraces its path cyclically with the same period as the signal, to emit a prebunched electron beam for transverse wave interaction prior to entry of the beam into the interaction region within said slow wave means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |