US4158791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helix traveling wave tubes with resonant loss
Assignee: Communications and Power Industries LLC
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Filing: 1977-02-10
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Granted: 1979-06-19
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Expires: 1997-02-10
Abstract
Abstract To suppress spurious oscillations in a helix-type traveling wave tube (TWT), frequency-sensitive loading is produced by a lossy resonant circuit attached to a dielectric support and coupled to the fields of the interaction circuit. The lossy circuit is resonant near the band-edge frequency. It may be a section of delay line with reflective terminations. In one embodiment, it is a metallized pattern on a dielectric rod used to support the helix.
Inventors
- 👤 Erling L. Lien
- 👤 Allan W. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:57
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/30
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
72 words
In a traveling wave tube comprising a helix-type slow wave interaction circuit supported by dielectric support rod extending in the direction of propagation, frequency sensitive loss means for absorbing wave energy flowing on said interaction circuit within a certain range of frequencies, said loss means comprising resistive conductor means affixed to a dielectric support member and shaped to form a resonant slow-wave circuit extending in said direction of propagation with wave-reflective ends.
Claim 2
Dependent Claim
72 words
In a traveling wave tube comprising a helix-type slow wave interaction circuit supported by dielectric support rod extending in the direction of propagation, frequency sensitive loss means for absorbing wave energy flowing on said interaction circuit within a certain range of frequencies, said loss means comprising resistive conductor means affixed to a dielectric support member and shaped to form a resonant slow-wave circuit extending in said direction of propagation with wave-reflective ends.
Claim 3
Dependent Claim
35 words
The tube of claim 1 wherein said interaction circuit is adapted to interact with an electron beam over a selected range of frequencies and said resonant circuit is resonant at a frequency outside said range.
Claim 4
Dependent Claim
18 words
The tube of claim 2 wherein said resonant frequency is near a band edge of said interaction circuit.
Claim 5
Dependent Claim
12 words
The tube of claim 1 wherein said wave-reflective ends are open circuits.
Claim 6
Dependent Claim
30 words
The tube of claim 1 wherein said resonant circuit is a section of slow-wave circuit with open-circuit ends and an integral number of electrical half-wavelengths long at said resonant frequency.
Claim 7
Dependent Claim
22 words
The tube of claim 1 wherein said resonant circuit propagates electromagnetic waves substantially in the direction of propagation of said interaction circuit.
Claim 8
Dependent Claim
20 words
The tube of claim 1 wherein said resonant circuit is affixed over substantially its entire length to said dielectric support.
Claim 9
Dependent Claim
15 words
The tube of claim 1 wherein said resonant circuit is shaped as a meander line.
Claim 10
Dependent Claim
16 words
The tube of claim 1 wherein said conductor is a metallized pattern on said dielectric support.
Claim 11
Dependent Claim
31 words
The tube of claim 1 wherein said dielectric support is a bar extending axially parallel to said interaction circuit and disposed circumferentially between two dielectric support rods of said interaction circuit.
Claim 12
Dependent Claim
15 words
The tube of claim 1 wherein said interaction circuit lies on a right circular cylinder.
Claim 13
Dependent Claim
70 words
In a traveling-wave tube comprising a helix-type slow wave interaction circuit, a combined means for providing both dielectric support of said interaction circuit and frequency sensitive loss for absorbing and suppressing energy within a certain range of frequencies, comprising: a dielectric rod supporting said interaction circuit having affixed thereto a resistive conductor shaped to form a resonant slow wave circuit extending in the direction of propagation of said interaction circuit.
Claim 14
Dependent Claim
70 words
In a traveling-wave tube comprising a helix-type slow wave interaction circuit, a combined means for providing both dielectric support of said interaction circuit and frequency sensitive loss for absorbing and suppressing energy within a certain range of frequencies, comprising: a dielectric rod supporting said interaction circuit having affixed thereto a resistive conductor shaped to form a resonant slow wave circuit extending in the direction of propagation of said interaction circuit.
Claim 15
Dependent Claim
19 words
The tube of claim 12 wherein said support rod is positioned between said circuit and a surrounding vacuum envelope.
Claim 16
Dependent Claim
11 words
The tube of claim 13 wherein said vacuum envelope is metallic.
Claim 17
Dependent Claim
16 words
The tube of claim 14 wherein the interior of said envelope is a right circular cylinder.
Claim 18
Dependent Claim
21 words
The tube of claim 13 comprising a plurality of support rods positioned between said circuit and said envelope and spaced apart.
Claim 19
Dependent Claim
38 words
The tube of claim 16 wherein said dielectric support and said support rods are cylinders extending axially parallel to said interaction circuit, and said dielectric support is spaced outside said circuit and between two of said support rods.
Claim 20
Dependent Claim
23 words
The tube of claim 14 wherein said loss circuit is affixed to said support rod insulated from said interaction circuit and said envelope.
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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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |