GB895299A - Duplex travelling-wave tube amplifier - Google Patents
Duplex travelling-wave tube amplifierInfo
- Publication number
- GB895299A GB895299A GB25797/58A GB2579758A GB895299A GB 895299 A GB895299 A GB 895299A GB 25797/58 A GB25797/58 A GB 25797/58A GB 2579758 A GB2579758 A GB 2579758A GB 895299 A GB895299 A GB 895299A
- Authority
- GB
- United Kingdom
- Prior art keywords
- helices
- helix
- stream
- input
- wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
Landscapes
- Microwave Amplifiers (AREA)
- Microwave Tubes (AREA)
Abstract
895,299. Travelling-wave tubes. SYLVANIA ELECTRIC PRODUCTS Inc. Aug. 11, 1958 [Aug. 19, 1957], No. 25797/58. Class 39 (1). A travelling-wave tube comprises at least two separate, parallel, laterally spaced slowwave structures coupled respectively to input and output connections and spaced apart in a direction transverse to the direction of propagation of waves from one end to the other of each structure, so as to be traversed in sequence by an electron stream having a velocity component in the same direction as and approximately equal to the phase velocity of the waves on at least part of each slowwave structure. In one embodiment, two flattened helices 9, 10, Fig. I are wound on insulators 11, 12 and are coupled to the input and output of the tube. The electron stream is provided on each side of the helices by an indirectly heated cathode comprising two strips 27, 28, Fig. 2 and focusing electrode 29. A magnet 46 provides a magnetic field at right angles to the electron stream which is thus bent at an acute angle to the axial direction of the helices, the velocity component of the stream in the axial direction being slightly greater than the phase velocity in the helices for the required mode of operation. A ferromagnetic strip 23 concentrates the field over the deflection space, and a metallic strip 22 shields the helices from each other. Beams 38-45, Fig. 1 are shown as being typical of the whole stream. In operation an input wave travelling along input helix 9 from left to right interacts with beam 38 which becomes velocity modulated as it travels towards output helix 10, an r-f signal being induced in this helix by the modulated beam. In the meantime, the input wave travels along helix 9 to the point where interaction with beam 39 begins, and this beam which also becomes velocity modulated in traversing the interhelix space, arrives at helix 10 at the correct moment to interact in additive phase relationship with the r-f field induced by beam 38 and travelling from left to right along helix 10. Thus the separate induced wave components reinforce each other and produce correspondingly stronger r-f fields to interact with the subsequent beams, the power efficiency associated with which becomes progressively greater. The process continues until saturation effects set in. To counteract saturation, control electrode 29 may be twisted so that the electron stream although still parallel to the helices at the input end of the tube (Fig. 2) gradually slopes away from the helices towards the output end, Fig. 3 (not shown). The envelope of the tube may serve to collect the electron stream and be provided with cooling fins 4-8. Insulators 11, 12 have lossy coatings 16, 20 at the output and input ends respectively to prohibit backward and reflected modes. Tuning may be effected by altering either the accelerating potential of the stream, or the magnetic field, or both. Another embodiment employs a number of suitably aligned electron guns providing a series of beams instead of a sheet stream, the magnetic field being unnecessary. A further embodiment uses a sheet electron stream at right angles to the axial direction, the helices in this case being skewed. Various methods of operating the tube, other than as a broad band amplifier are given, for example as a backward wave oscillator, when helix 10 may or may not be used, or as a narrow band amplifier with feed back.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US678892A US2928021A (en) | 1957-08-19 | 1957-08-19 | Duplex traveling-wave tube amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
GB895299A true GB895299A (en) | 1962-05-02 |
Family
ID=24724726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25797/58A Expired GB895299A (en) | 1957-08-19 | 1958-08-11 | Duplex travelling-wave tube amplifier |
Country Status (3)
Country | Link |
---|---|
US (1) | US2928021A (en) |
FR (1) | FR1216949A (en) |
GB (1) | GB895299A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101793277B1 (en) | 2007-02-21 | 2017-11-20 | 테라피직스 코포레이션 | High frequency helical amplifier and oscillator |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1003491A (en) * | 1947-01-11 | 1952-03-18 | Comp Generale Electricite | Progressive wave tubes improvements |
FR941522A (en) * | 1947-01-17 | 1949-01-13 | Materiel Telephonique | Velocity Modulated Tubes |
BE479858A (en) * | 1947-01-25 | |||
FR986811A (en) * | 1949-03-21 | 1951-08-06 | Csf | Electron gun for transverse magnetic field wave propagation tubes |
NL158347B (en) * | 1951-01-04 | Matsushita Electric Ind Co Ltd | TELEVISION TRANSMITTER FOR SEQUENTIAL AND ALTERNATING PER HORIZONTAL SCAN PERIOD TRANSMISSION OF VIDEO SIGNALS FOR MONOCHROMATIC IMAGES ASSOCIATED WITH TWO DIFFERENT TELEVISION PROGRAMS. | |
US2811664A (en) * | 1952-10-31 | 1957-10-29 | Kazan Benjamin | Traveling wave thermionic tube |
US2809320A (en) * | 1953-11-27 | 1957-10-08 | Zenith Radio Corp | Traveling-wave tubes |
US2804511A (en) * | 1953-12-07 | 1957-08-27 | Bell Telephone Labor Inc | Traveling wave tube amplifier |
BE544281A (en) * | 1955-01-13 |
-
1957
- 1957-08-19 US US678892A patent/US2928021A/en not_active Expired - Lifetime
-
1958
- 1958-08-11 GB GB25797/58A patent/GB895299A/en not_active Expired
- 1958-08-18 FR FR772624A patent/FR1216949A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2928021A (en) | 1960-03-08 |
FR1216949A (en) | 1960-04-29 |
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