GB772002A - Improvements in or relating to travelling wave tubes - Google Patents
Improvements in or relating to travelling wave tubesInfo
- Publication number
- GB772002A GB772002A GB33150/54A GB3315054A GB772002A GB 772002 A GB772002 A GB 772002A GB 33150/54 A GB33150/54 A GB 33150/54A GB 3315054 A GB3315054 A GB 3315054A GB 772002 A GB772002 A GB 772002A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wave
- backward
- frequency
- helix
- output
- 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
- H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
-
- 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
- H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
- H01J25/40—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field the backward travelling wave being utilised
Landscapes
- Microwave Tubes (AREA)
- Microwave Amplifiers (AREA)
Abstract
772,002. Travelling wave tubes. WESTERN ELECTRIC CO., Inc. Nov. 16, 1954 [Nov. 18, 1953], No. 33150/54. Class 39(1). [Also in Group XL(c)] A travelling wave tube comprises a first delay line carrying a spatial harmonic backward wave, i.e. a wave of negative phase velocity, for modulating the beam, and a second separate delay line in which a forward wave is induced by the modulated beam, the output being taken from the downstream end of the second, delay line. The backward wave circuit can be a bifilar helix, Fig. 1 (not shown) whose axis is parallel to but displaced from the tube axis, a lecher line 44, 45, Fig. 2, having cylinders 46 connected alternately to 44, 45, a waveguide 64, Fig. 3A, loaded with slats 65 extending diametrically thereacross successive slats being rotated relatively to one another and carrying cylinders 66 for passage of the beam or a slotted cylinder, Fig. 4 (not shown) the slots being cut in an interleaved pattern. The forward wave circuit is preferably a helix 50 or 72. Both ends of the backward wave circuit and the upstream end of the forward wave circuit have reflectionless terminations of colloidal graphite coated on the tube envelope the thickness of the coating being tapered, or alternatively the backward wave circuit terminations can be two pairs of dielectric rods 48, 49 or 67, 68 having a coating of loss material of varying thickness. The downstream end of the forward wave helix is of gradually increasing pitch for impedance matching. The backward wave used is a spatial harmonic, the forward wave usually a fundamental wave. In Fig. 1 (not shown) the two helices of the bifilar helix can be at different D.C. potentials to give electrostatic focusing or are at the same potential if magnetic focusing is used. Frequency modulation is achieved by connecting the modulation source between the cathode and backward wave circuit and amplitude modulation by modulating the voltage on helix 50 by source 52 or by modulating the beam current. Fig. 2 can use periodic electrostatic focusing or conventional magnetic focusing. The beam velocities in the forward and backward wave circuits can be the same or different. To improve the uniformity of the output power level with changes in frequency the forward wave circuit can have a frequency response complementary to the frequency response of the backward wave circuit, so the output power level does not change with frequency or the frequency responses of the backward and forward wave circuits can be chosen to give an output of any other desired frequency characteristic. In the mixer of Fig. 3A an external signal is applied at 70 and the desired mixed frequency selected by operating the forward wave helix in a dispersive region ; the output can include a filter to remove fundamental and undesired modulation products. The coating of loss material 72 can be dispensed with if the forward wave helix is given non- reciprocal characteristics by insertion of a ferrite element as described in Specification 750,208. In another embodiment, Fig. 4 (not shown) an external input is applied to the downstream end of the backward wave circuit and the slot length decreases gradually towards the downstream end of the backward wave circuit for impedance matching. In all forms, an additional electron source can be provided between the forward and backward wave circuits to increase the power output. The beam path can be non-straight, e.g. circular when used in magnetron type travelling wave tubes. Pulsed operation can be achieved by placing deflecting means between the backward and forward wave circuits, e.g. in Fig. 1 (not shown) the output will be frequency modulated pulses. Specification 772,001 also is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US392946A US2891191A (en) | 1953-11-18 | 1953-11-18 | Backward wave tube |
Publications (1)
Publication Number | Publication Date |
---|---|
GB772002A true GB772002A (en) | 1957-04-10 |
Family
ID=23552658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33150/54A Expired GB772002A (en) | 1953-11-18 | 1954-11-16 | Improvements in or relating to travelling wave tubes |
Country Status (7)
Country | Link |
---|---|
US (1) | US2891191A (en) |
BE (1) | BE533398A (en) |
CH (1) | CH332990A (en) |
DE (1) | DE1105999B (en) |
FR (1) | FR1108860A (en) |
GB (1) | GB772002A (en) |
NL (1) | NL191722A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1260638B (en) * | 1957-05-22 | 1968-02-08 | Siemens Ag | Delay line with band-pass character, in particular for running field pipes, and methods for their production and running field pipes with such delay lines |
DE1282798B (en) * | 1961-04-22 | 1968-11-14 | Nippon Electric Co | Microwave oscillator tubes with a reverse wave oscillator part and an amplifier part following in the beam direction |
DE1441244B1 (en) * | 1962-03-22 | 1970-08-20 | Raytheon Co | Running field pipes with controllable output power |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3065373A (en) * | 1955-11-29 | 1962-11-20 | Bell Telephone Labor Inc | High frequency apparatus of the traveling wave type |
DE1240999B (en) * | 1957-09-26 | 1967-05-24 | Standard Elektrik Lorenz Ag | Running field oscillator tubes |
LU37155A1 (en) * | 1958-05-05 | |||
US3069588A (en) * | 1958-09-26 | 1962-12-18 | Raytheon Co | Traveling wave tubes |
US2964671A (en) * | 1958-12-03 | 1960-12-13 | Rca Corp | High efficiency traveling wave tubes |
US3090886A (en) * | 1959-07-03 | 1963-05-21 | Int Standard Electric Corp | Electric wave generators |
US3104344A (en) * | 1960-04-06 | 1963-09-17 | Itt | High power traveling wave tube |
FR1335088A (en) * | 1962-07-04 | 1963-08-16 | Csf | New resonant cavity and devices that use it |
GB1343355A (en) * | 1971-11-09 | 1974-01-10 | English Electric Valve Co Ltd | Travelling wave tubes |
US3825794A (en) * | 1973-03-08 | 1974-07-23 | Varian Associates | Microwave tube having an improved output section |
FR2518802A1 (en) * | 1981-12-22 | 1983-06-24 | Thomson Csf | DELAY LINE FOR PROGRESSIVE WAVE TUBE |
US6987360B1 (en) * | 2004-03-31 | 2006-01-17 | “Calabazas Creek Research, Inc” | Backward wave coupler for sub-millimeter waves in a traveling wave tube |
US11493622B1 (en) | 2018-02-08 | 2022-11-08 | Telephonics Corp. | Compact radar with X band long-distance weather monitoring and W band high-resolution obstacle imaging for landing in a degraded visual environment |
CN110310874A (en) * | 2018-03-20 | 2019-10-08 | 海鹰航空通用装备有限责任公司 | Cascade frequency multiplication backward wave oscillator |
CN111063593B (en) * | 2019-12-23 | 2022-10-14 | 南京三乐集团有限公司 | X-waveband 900W pulse space traveling wave tube |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL187376B (en) * | 1946-01-11 | Northern Telecom Ltd | TELEPHONE VOICE NETWORK. | |
FR957735A (en) * | 1947-01-25 | 1950-02-24 | ||
US2657305A (en) * | 1947-01-28 | 1953-10-27 | Hartford Nat Bank & Trust Co | Traveling wave tube mixing apparatus |
US2541843A (en) * | 1947-07-18 | 1951-02-13 | Philco Corp | Electronic tube of the traveling wave type |
BE486897A (en) * | 1948-01-20 | |||
US2730647A (en) * | 1949-06-22 | 1956-01-10 | Bell Telephone Labor Inc | Microwave amplifier |
US2585582A (en) * | 1949-07-07 | 1952-02-12 | Bell Telephone Labor Inc | Electron gun |
US2720610A (en) * | 1950-07-27 | 1955-10-11 | Kazan Benjamin | Noise reducing travelling-wave tube |
-
0
- BE BE533398D patent/BE533398A/xx unknown
- NL NL191722D patent/NL191722A/xx unknown
-
1953
- 1953-11-18 US US392946A patent/US2891191A/en not_active Expired - Lifetime
-
1954
- 1954-07-17 FR FR1108860D patent/FR1108860A/en not_active Expired
- 1954-10-05 DE DEW15032A patent/DE1105999B/en active Pending
- 1954-11-16 GB GB33150/54A patent/GB772002A/en not_active Expired
- 1954-11-18 CH CH332990D patent/CH332990A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1260638B (en) * | 1957-05-22 | 1968-02-08 | Siemens Ag | Delay line with band-pass character, in particular for running field pipes, and methods for their production and running field pipes with such delay lines |
DE1282798B (en) * | 1961-04-22 | 1968-11-14 | Nippon Electric Co | Microwave oscillator tubes with a reverse wave oscillator part and an amplifier part following in the beam direction |
DE1441244B1 (en) * | 1962-03-22 | 1970-08-20 | Raytheon Co | Running field pipes with controllable output power |
Also Published As
Publication number | Publication date |
---|---|
CH332990A (en) | 1958-09-30 |
US2891191A (en) | 1959-06-16 |
BE533398A (en) | |
NL191722A (en) | |
DE1105999B (en) | 1961-05-04 |
FR1108860A (en) | 1956-01-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB772002A (en) | Improvements in or relating to travelling wave tubes | |
US2806972A (en) | Traveling-wave tube | |
US2584597A (en) | Traveling wave tube | |
US2806177A (en) | Signal delay tube | |
US2566087A (en) | Tube of the magnetron type for ultra-short waves | |
US2753481A (en) | Travelling wave oscillators | |
Karp | Traveling-wave tube experiments at millimeter wavelengths with a new, easily built, space harmonic circuit | |
Pierce | The wave picture of microwave tubes | |
US2439387A (en) | Electronic tuning control | |
GB672770A (en) | High frequency electron discharge device and circuit | |
US2806975A (en) | Transition from bifilar helix to waveguide for backward wave oscillator | |
GB668554A (en) | Improvements in or relating to signalling systems employing travelling wave discharge apparatus | |
Tien | Bifilar helix for backward-wave oscillators | |
US2945981A (en) | Magnetron-type traveling wave tube | |
GB1198482A (en) | Electron Beam Device | |
US2761915A (en) | Helix couplers | |
JPH0155601B2 (en) | ||
US3573540A (en) | Microwave traveling wave device with electronically switched interaction characteristics | |
US2823333A (en) | Traveling wave tube | |
US2922917A (en) | Nonreciprocal elements in microwave tubes | |
US2843733A (en) | Search receiver with traveling wave tube | |
US3009078A (en) | Low noise amplifier | |
US2758244A (en) | Electron beam tubes | |
US3104340A (en) | Broadband klystron | |
US3090925A (en) | Parametric amplifier |