US3742293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency circuits for electron tubes and tubes comprising such circuits
Assignee: Thales SA
•
Filing: 1971-12-15
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Granted: 1973-06-26
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Expires: 1991-12-15
Abstract
Abstract High frequency circuits for the anodes of electron tubes, in particular magnetrons. There is associated with the usual cavities of said anodes a second high frequency circuit arranged in parallel with the first one constituted by said cavities, to provide coupling between adjacent cavities and to maintain their pi mode operation despite possible geometrical differences. Moreover, by making the second circuit an absorptive one, other unwanted modes are suppressed.
Inventors
- 👤 G Mourier
- 👤 P Chavanat
- 👤 B Epsztein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:24
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/50; H01J25/52; H01J25/58; H01J25/587; H01J23/00; H01J23/16; H01J23/24; H01J25/593
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
120 words
In a multi-cavity magnetron, an anode structure comprising two high frequency structures, respectively a main and a secondary one, arranged parallel with one another on a cylindrical wall, said main structure comprising, disposed onto the said cylindrical wall, a plurality of identical high frequency adjacent cavities separated by conductor elements, and constituting a main high frequency circuit, said secondary structure comprising, disposed onto the said cylindrical wall, conductor elements defining between them identical spaces, and constituting a secondary high frequency circuit said secondary high frequency circuit being disposed relative to said main circuit in such a way that the two circuits are coupled, each space of the secondary circuit producing electromagnetic coupling between two adjacent cavities of the main circuit.
Claim 2
Dependent Claim
120 words
In a multi-cavity magnetron, an anode structure comprising two high frequency structures, respectively a main and a secondary one, arranged parallel with one another on a cylindrical wall, said main structure comprising, disposed onto the said cylindrical wall, a plurality of identical high frequency adjacent cavities separated by conductor elements, and constituting a main high frequency circuit, said secondary structure comprising, disposed onto the said cylindrical wall, conductor elements defining between them identical spaces, and constituting a secondary high frequency circuit said secondary high frequency circuit being disposed relative to said main circuit in such a way that the two circuits are coupled, each space of the secondary circuit producing electromagnetic coupling between two adjacent cavities of the main circuit.
Claim 3
Dependent Claim
45 words
An anode structure as claimed in claim 1, in which the conductor elements of said secondary structure are arranged in the plane of symmetry of said cavities which contains the axis of said cylindrical wall, thereby dividing each of said cavities into two identical parts.
Claim 4
Dependent Claim
29 words
An anode structure circuit as claimed in claim 1, in which said conductor elements of the two high frequency structures are arranged at the same side of said wall.
Claim 5
Dependent Claim
28 words
An anode structure as claimed in claim 1, in which the conductor elements of the two high frequency structures are respectively located at either side of said wall.
Claim 6
Dependent Claim
32 words
An anode structure as claimed in claim 1, in which said cavities of the main structure and said identical spaces of the secondary structure are coupled by holes provided within their walls.
Claim 7
Dependent Claim
31 words
An anode structure as claimed in claim 1, in which said spaces and cavities have dimensions which are such as to cause them to exhibit electromagnetic resonance at the same frequency.
Claim 8
Dependent Claim
34 words
An anode structure as claimed in claim 1, in which at least part of the conductoR elements of one of the two structures at least, is equipped with a material absorbent for electromagnetic waves.
Claim 9
Dependent Claim
26 words
An anode structure as claimed in claim 1, in which the conductor elements of said main and secondary structures are movable in relation to one another.
Claim 10
Dependent Claim
27 words
An anode structure as claimed in claim 8, in which said relative movement is a translatory one in a direction parallel to the axis of said cylinder.
Claim 11
Dependent Claim
36 words
An anode structure as claimed in claim 1, in which said identical spaces of said secondary structure extend in part at least into a space created within said conductor elements of the main high frequency structure.
Claim 12
Dependent Claim
32 words
An anode structure as claimed in claim 1, in which said conductor elements of the secondary structure take the form of bars located externally of said adjacent cavities on the main structure.
Claim 13
Dependent Claim
42 words
An anode structure as claimed in claim 11, in which said bars terminate in a further bar perpendicular to them, and giving them a T-shape, said further bar being parallel to an external edge of the conductor elements of said main structure.
Claim 14
Dependent Claim
31 words
An anode structure as claimed in claim 1, in which said conductor elements of the secondary structure take the form of plates located inside said adjacent cavities of the main structure.
Claim 15
Dependent Claim
31 words
An anode structure as claimed in claim 1, in which said conductor elements of the secondary structure take the form of bars located inside said adjacent spaces of the main structure.
Claim 16
Dependent Claim
60 words
An anode structure as claimed in claim 14, in which said elements are terminated in a perpendicular rod or bar producing a T-shape arrangement, said bar being parallel to an external edge of the conductor elements of said main structure, which conductor elements are provided with openings opposite the ends of the perpendicular bars to provide coupling between said bars.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |