US3087089A - Line to travelling wave tube coupling - Google Patents

Line to travelling wave tube coupling Download PDF

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Publication number
US3087089A
US3087089A US768241A US76824158A US3087089A US 3087089 A US3087089 A US 3087089A US 768241 A US768241 A US 768241A US 76824158 A US76824158 A US 76824158A US 3087089 A US3087089 A US 3087089A
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US
United States
Prior art keywords
tube
line
high frequency
travelling wave
focussing
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 - Lifetime
Application number
US768241A
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English (en)
Inventor
Niclas Karl-Bernhard
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.)
Telefunken AG
Original Assignee
Telefunken AG
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Filing date
Publication date
Application filed by Telefunken AG filed Critical Telefunken AG
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Publication of US3087089A publication Critical patent/US3087089A/en
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    • 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
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/54—Filtering devices preventing unwanted frequencies or modes to be coupled to, or out of, the interaction circuit; Prevention of high frequency leakage in the environment

Definitions

  • the present invention relates to apparatus for coupling a high frequency line, particularly, to a helical delay line of an electrical discharge device, such as a traveling wave tube.
  • the vacuum envelop of this tube is of dielectric material and is surrounded -'by a metal tube connected to the high frequency line so as to conduct high frequency energy and carrying the focussing means (not shown) which focus the electron beam as it travels through the delay line, this tube being hereinafter referred to, in the specification, simply as the focussing tube.
  • the coupling end of the delay line of this travelling wave tube is provided with at least one cup-shaped sleeve, located within the vacuum tube, said sleeve forming, together with the metal tube outside of the vacuum envelop, a coaxial line of A wave length, said coaxial line providing a high frequency short-circuit across the end of the cupshaped sleeve, the wave length referred to being that of a wave whose frequency is that to which the system is tuned.
  • M4 sleeves at the ends of the delay line for the purpose of coupling the high frequency lines to the output of a traveling wave tube. Furthermore, it has been known to provide a number of slots, such as longitudinal slots, in these M4 sleeves in the axial direction. In addition to this, it has been known to use the abovementioned focussing tube as the outer conductor of the 4 coupling system.
  • D is the inner diameter of the dielectric vacuum envelop
  • D is the outer diameter of the dielectric vacuum envelop D
  • E is the dielectric coefficient of the vacuum tube.
  • the cut-off wave length of the H mode is obtained in first approximation by:
  • the reason for the occurrence of the minimum of the cut-off wave length is that the dielectric between the two high frequency conductors of the M4 coupling system is not homogeneous, as it comprises air and glass layers. It is possible to shift the cut-off wave length of the H mode towards the shortest possible wave length by suitably dimensioning the inner diameter D of the focussing tube. An optimum match of the delay line tothe high frequency line to be coupled is possible in this manner and, simultaneously, the propagation of the H mode is safely prevented.
  • the focussing tube is suitably made with a sufficiently large inner diameter D
  • the optimum diameter D with respect to the cut-off wave length of the H coaxial cable mode would result in some instances in undesirably large nonhomogeneities of the field in the vicinity of the short circuit plane.
  • FIGURE 1 shows a cross section of an embodiment of the coupling apparatus according to the invention
  • FIGURE 2 is an enlarged perspective view of the A/ 4 sleeve according to the invention.
  • a travelling wave tube 1 has a vacuum envelop, for example, of glass, having an inner diameter D and an outer diameter D A ) ⁇ /4 sleeve 3 has an outer diameter D and a foccusing tube 6 has an inner diameter D Since the diameters D D and D are fixed in case of a given travelling wave tube, the optimum diameter D of the focussing tube can be calculated with the aid of the above mentioned equation.
  • the focussing tube 6 has annular flanges 7 extending inwardly and constricting the inner cross section of the focussing tube in such a manner, that the proper spacing between the inner and the outer conductors of the A/ 4 coupling system is obtained at these locations for providing the desired short circuits.
  • the high frequency line 2 to be coupled is now coupled to a delay line (not shown) through the two ⁇ /4 sleeve 3.
  • These sleeves 3 are provided with the novel combination of three longitudinal slots 4 and with three trans verse slots running circumferentially in accordance with the invention, as best shown in the perspective illustration of FIGURE 2.
  • D is the inner diameter of the dielectric vacuum envelop D2 is the outer diameter of the dielectric vacuum envelop D, is said inner diameter of the metal tube D is said outer diameter of said ⁇ /4 sleeve means, and
  • E is said dielectric coefiicient of the interposed travelling wave tube.

Landscapes

  • Microwave Tubes (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguides (AREA)
US768241A 1957-10-26 1958-10-20 Line to travelling wave tube coupling Expired - Lifetime US3087089A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET14331A DE1049011B (de) 1957-10-26 1957-10-26 Anordnung zur Ankopplung einer Hochfrequenzleitung an die vorzugsweise wendelfoermige Verzoegerungsleitung einer elektrischen Entladungseinrichtung nach Art einer Lauffeldroehre

Publications (1)

Publication Number Publication Date
US3087089A true US3087089A (en) 1963-04-23

Family

ID=7547613

Family Applications (1)

Application Number Title Priority Date Filing Date
US768241A Expired - Lifetime US3087089A (en) 1957-10-26 1958-10-20 Line to travelling wave tube coupling

Country Status (4)

Country Link
US (1) US3087089A (de)
DE (1) DE1049011B (de)
FR (1) FR1214948A (de)
GB (1) GB903092A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3634790A (en) * 1969-03-28 1972-01-11 Thomson Csf Parasitic mode suppressor
EP0339374A1 (de) * 1988-04-25 1989-11-02 Matsushita Electronics Corporation Magnetron
US5523651A (en) * 1994-06-14 1996-06-04 Hughes Aircraft Company Plasma wave tube amplifier/primed oscillator

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500417A (en) * 1945-04-13 1950-03-14 Bell Telephone Labor Inc Electrical resonator
US2512468A (en) * 1943-05-12 1950-06-20 Emi Ltd Wave guide with mode suppression means
US2611102A (en) * 1948-11-13 1952-09-16 Sylvania Electric Prod Traveling wave tube
US2672571A (en) * 1950-08-30 1954-03-16 Univ Leland Stanford Junior High-frequency oscillator
DE944863C (de) * 1951-07-15 1956-07-19 Siemens Ag Daempfungsanordnung fuer eine Elektronenroehre fuer sehr kurze Wellen
US2759156A (en) * 1945-11-19 1956-08-14 Elmer L Younker Waveguide mode filter
US2799797A (en) * 1952-08-29 1957-07-16 Rca Corp Coupling circuit for helical delay lines
US2877434A (en) * 1945-11-19 1959-03-10 Harold K Farr Mode filter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512468A (en) * 1943-05-12 1950-06-20 Emi Ltd Wave guide with mode suppression means
US2500417A (en) * 1945-04-13 1950-03-14 Bell Telephone Labor Inc Electrical resonator
US2759156A (en) * 1945-11-19 1956-08-14 Elmer L Younker Waveguide mode filter
US2877434A (en) * 1945-11-19 1959-03-10 Harold K Farr Mode filter
US2611102A (en) * 1948-11-13 1952-09-16 Sylvania Electric Prod Traveling wave tube
US2672571A (en) * 1950-08-30 1954-03-16 Univ Leland Stanford Junior High-frequency oscillator
DE944863C (de) * 1951-07-15 1956-07-19 Siemens Ag Daempfungsanordnung fuer eine Elektronenroehre fuer sehr kurze Wellen
US2799797A (en) * 1952-08-29 1957-07-16 Rca Corp Coupling circuit for helical delay lines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3634790A (en) * 1969-03-28 1972-01-11 Thomson Csf Parasitic mode suppressor
EP0339374A1 (de) * 1988-04-25 1989-11-02 Matsushita Electronics Corporation Magnetron
US5021713A (en) * 1988-04-25 1991-06-04 Matsushita Electronics Corporation Magnetron
US5523651A (en) * 1994-06-14 1996-06-04 Hughes Aircraft Company Plasma wave tube amplifier/primed oscillator

Also Published As

Publication number Publication date
GB903092A (en) 1962-08-09
DE1049011B (de) 1959-01-22
FR1214948A (fr) 1960-04-12

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