Patent US3755706A successfully refreshed from Google Patents.
US3755706A
Expired / Lapsed
US
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Miniaturized traveling wave tube
Assignee: Varian Medical Systems Inc
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Filing: 1972-03-20
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Granted: 1973-08-28
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Expires: 1992-03-20
Abstract
Abstract A microwave beam tube operating above 4GHz is miniaturized by designing the electron gun to produce an electron beam having a microperveance within the range of 0.8 to 2.2. A periodic permanent magnet beam focusing structure is provided which employs ring-shaped permanent magnets having a coercive force in excess of 2,000 gauss, whereby the length, size, and weight of the tube, for a given gain and output power, are reduced substantially.
Inventors
- 👤 A Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:23
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/0873
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
In a miniaturized periodic permanent magnet focused microwave beam tube, means for forming and projecting a beam of electrons of a microperveance within the range of 0.8 to 2.2 over an elongated beam path, microwave circuit means disposed along said beam path in microwave energy exchanging relation with the beam for cumulative electron interaction with the beam to develop microwave energy on said microwave circuit, such developed microwave energy being of a frequency above 4GHz, periodic ringshaped axially polarized permanent magnet means having a coercive force in excess of 2,000 oersteds and disposed coaxially of and along said beam path for developing a periodic magnetic beam focusing field of an intensity within the beam path in excess of 2,000 gauss for focusing the electron beam through said microwave circuit.
Claim 2
Dependent Claim
129 words
In a miniaturized periodic permanent magnet focused microwave beam tube, means for forming and projecting a beam of electrons of a microperveance within the range of 0.8 to 2.2 over an elongated beam path, microwave circuit means disposed along said beam path in microwave energy exchanging relation with the beam for cumulative electron interaction with the beam to develop microwave energy on said microwave circuit, such developed microwave energy being of a frequency above 4GHz, periodic ringshaped axially polarized permanent magnet means having a coercive force in excess of 2,000 oersteds and disposed coaxially of and along said beam path for developing a periodic magnetic beam focusing field of an intensity within the beam path in excess of 2,000 gauss for focusing the electron beam through said microwave circuit.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said microwave circuit means is a slow wave circuit.
Claim 4
Dependent Claim
48 words
The apparatus of claim 1 wherein said ring-shaped permanent magnets are made of a rare earth cobalt material wherein the rare earth material component is selected from the group consisting of, Y, Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 wherein said ring magnets have a ratio of outer diameter to inner diameter falling in the range between 1.3 and 3.0.
Claim 6
Dependent Claim
36 words
The apparatus of claim 1 including means for extracting the developed microwave energy from said microwave circuit as output microwave power, and wherein the output microwave power is in a range less than 100 watts c.w.
Claim 7
Dependent Claim
20 words
The apparatus of claim 1 wherein said microwave energy developed on said circuit is centered at a frequency above 8GHz.
Claim 8
Dependent Claim
15 words
The apparatus of claim 1 wherein said microwave circuit is a helix slow wave circuit.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |