US3708764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Travelling wave tubes
Assignee: Thales SA
•
Filing: 1971-01-22
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Granted: 1973-01-02
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Expires: 1991-01-22
Abstract
Abstract An improvement in piloted amplifier or locked-oscillator travelling wave tubes of the ''''M'''' type, said improvement consisting in a high frequency device for directly modulating the beam in density at the cathode by a grid, this device, in a preferred embodiment of the invention, being constituted by coaxial waveguide of T - form, one of the branches of the T being terminated on the one hand by the cathode supported by the internal conductor of the coaxial section, and on the other hand by a grid supported by the external conductor, and the high frequency signal for modulating the beam being injected into said coaxial waveguide, and having a maximum amplitude in the neighborhood of the cathode.
Inventors
- 👤 P Guenard
- 👤 B Epsztein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:49
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/36; H01J23/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A traveling wave tube of the M-type including: a delay line, an electrode substantially parallel thereto and raised to a potential which is negative relative to the potential of the delay line whereby an electric field is provided between the delay line and the electrode, means for providing within said tube a magnetic field normal to the electric field, and a cathode for propagating an electron beam normal to both of the fields, said tube further comprising: means for modulating the electron beam being located at the immediate vicinity of the cathode and being energized both by a negative biasing potential and ultrahigh frequency energy which is the energy to be propagated along the delay line.
Claim 2
Dependent Claim
116 words
A traveling wave tube of the M-type including: a delay line, an electrode substantially parallel thereto and raised to a potential which is negative relative to the potential of the delay line whereby an electric field is provided between the delay line and the electrode, means for providing within said tube a magnetic field normal to the electric field, and a cathode for propagating an electron beam normal to both of the fields, said tube further comprising: means for modulating the electron beam being located at the immediate vicinity of the cathode and being energized both by a negative biasing potential and ultrahigh frequency energy which is the energy to be propagated along the delay line.
Claim 3
Dependent Claim
24 words
The traveling wave tube of the M-type according to claim 1 wherein said modulating means comprises an ultra-high frequency input means for said tube.
Claim 4
Dependent Claim
26 words
The traveling wave tube of the M-type according to claim 2 comprising: further ultra-high frequency input means for feeding ultra-high frequency energy to the delay line.
Claim 5
Dependent Claim
31 words
The traveling wave tube of the M-type according to claim 3 wherein said ultra-high frequency input means and said further ultra-high frequency input are fed by a common ultra-high frequency source.
Claim 6
Dependent Claim
43 words
The traveling wave tube of the M-type according to claim 1, comprising: means for collecting ultra-high frequency energy at an end of said delay line which is remote from said cathode, and matched absorbing means coupled to the other one of said ends.
Claim 7
Dependent Claim
42 words
The traveling wave tube of the M-type according to claim 1, comprising: means for collecting ultra-high frequency energy at an end, of said delay line which is near said cathode, and matched absorbing means coupled to the other one of said ends.
Claim 8
Dependent Claim
67 words
The traveling wave tube of the M-type according to claim 1, wherein said means for modulating the electron beam at the cathode comprises a coaxial guide, one end thereof terminated by the cathode, supported by an internal conductor of the coaxial section separated from the cathode by a selected space terminating the other end thereof; and a grid supported by an external conductor of the coaxial section.
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |