GB677986A - Improvements in electronic discharge tubes - Google Patents

Improvements in electronic discharge tubes

Info

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
Application number
GB12123/48A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxar Space LLC
Original Assignee
Philco Ford Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US761798A external-priority patent/US2541843A/en
Application filed by Philco Ford Corp filed Critical Philco Ford Corp
Publication of GB677986A publication Critical patent/GB677986A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24Slow-wave structures, e.g. delay systems
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/34Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
    • H01J25/36Tubes 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
    • H01J25/38Tubes 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.
GB12123/48A 1947-07-18 1948-05-03 Improvements in electronic discharge tubes Expired GB677986A (en)

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)

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