GB677986A - Improvements in electronic discharge tubes - Google Patents
Improvements in electronic discharge tubesInfo
- Publication number
- GB677986A GB677986A GB12123/48A GB1212348A GB677986A GB 677986 A GB677986 A GB 677986A GB 12123/48 A GB12123/48 A GB 12123/48A GB 1212348 A GB1212348 A GB 1212348A GB 677986 A GB677986 A GB 677986A
- Authority
- GB
- United Kingdom
- Prior art keywords
- guides
- wave
- output
- guide
- turns
- 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
- 239000000463 material Substances 0.000 abstract 4
- 239000002184 metal Substances 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 3
- 238000012986 modification Methods 0.000 abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000003989 dielectric material Substances 0.000 abstract 1
- 230000003467 diminishing effect Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 229910002804 graphite Inorganic materials 0.000 abstract 1
- 239000010439 graphite Substances 0.000 abstract 1
- 239000012212 insulator Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/24—Slow-wave structures, e.g. delay systems
-
- 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
- H01J25/38—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 forward travelling wave being utilised
Landscapes
- Microwave Tubes (AREA)
Abstract
677,986. Travelling-wave tubes. PHILCO CORPORATION. May 3,1948 [July 18, 1947], No. 12123/48. Class 39 (i). [Also in Group XL (b)] In a travelling-wave electron discharge device the velocity modulating and energy extraction circuits are constituted by separate helically-coiled hollow pipe wave-guides 30, 34, Fig. 1, and the output guide is of progressively diminishing pitch in the direction of travel of the beam to maintain synchronism between beam and wave. In Fig. 1 the wave-guides are bounded by metal strips 31, 36 wound inside a metal cylinder 33; the guide 30 is of uniform pitch. The collector potential may correspond to the reduction in beam velocity when it has given up energy to the wave. The coupling to input and output circuits is via coaxial lines 39, 44, and a solenoid 51 wound on insulator 52 focusses the beam; a magnetic shield (not shown) may also be provided. The guides 30, 34 may be provided with matched terminations at both ends consisting of uniformly-tapered helical blocks of lossy material 54, such as ceramic containing powdered graphite, having a circumferential length of at least one wavelength at the lowest frequency of operation. Alternatively the end turns of the guides may be tapered and covered with the lossy material The guides 30, 34 are excited in the TE 0 mode with an axial electric field component which is maximum at the inner edges of the strips 31, 36 and diminishes sinusoidally to zero at the inner surface of the cylinder 33, and the wave travels around one complete turn, in one half-cycle. The space between the input and output guides serves as a drift space. The diameter of glass envelope 21 is such that considered as a separate wave-guide its cut-off frequency is considerably above the operating frequency band. The device may function as an oscillator by providing an external feed-back path between coaxial lines 39, 44 which contains a tunable resonant cavity to control and stabilize the frequency, or alternatively by producing suitable wave reflections inside the device. It may also be used as a frequency converter, modulator or detector. The characteristic impedance and other electrical constants of the guide 34 of variable pitch may be rendered constant along its length by inserting a tapered helical block of dielectric material therein or by varying the outer diameter of the helix along its length. In a modification, Fig. 2 (not shown), the input and output guides have their turns spaced apart. The wave-guides have lossy matched terminations similar to those shown in Fig. 1, and further lossy material may be provided between the two guides and between the turns of the wave-guides. The spaces between the turns of the guides act as drift spaces. In a further modification, Fig. 3 (not shown), the helical guides are enclosed within the evacuated envelope, and insulating seals are provided in the input and output coaxial lines to maintain the vacuum. In further modifications, the guides may be wound with a large pitch if they are filled with a solid low loss dielectric. They may be formed of a resistive material instead of metal and a D.C. potential gradient set up along their length so as to improve the efficiency.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US677986XA | 1947-07-18 | 1947-07-18 | |
US761798A US2541843A (en) | 1947-07-18 | 1947-07-18 | Electronic tube of the traveling wave type |
Publications (1)
Publication Number | Publication Date |
---|---|
GB677986A true GB677986A (en) | 1952-08-27 |
Family
ID=26748271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12123/48A Expired GB677986A (en) | 1947-07-18 | 1948-05-03 | Improvements in electronic discharge tubes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB677986A (en) |
-
1948
- 1948-05-03 GB GB12123/48A patent/GB677986A/en not_active Expired
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