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US3264513A - Deformable wall tuning of resonant cavities for electron discharge tubes - Google Patents

Deformable wall tuning of resonant cavities for electron discharge tubes Download PDF

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Publication number
US3264513A
US3264513A US207546A US20754662A US3264513A US 3264513 A US3264513 A US 3264513A US 207546 A US207546 A US 207546A US 20754662 A US20754662 A US 20754662A US 3264513 A US3264513 A US 3264513A
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US
United States
Prior art keywords
wall
walls
cavity
length
electron discharge
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
US207546A
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English (en)
Inventor
Bagnall John Ralph
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.)
Teledyne UK Ltd
Original Assignee
English Electric Valve Co Ltd
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
Application filed by English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
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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
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/18—Resonators
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof
    • H01J23/207—Tuning of single resonator
    • 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
    • H01J23/18—Resonators
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof

Definitions

  • FIGURES 4 and 5 are views of the same nature as-FIGURES 2 and 3 respectively, showing another embodiment of the invention.
  • FIGURE 1 illustrates the so-called cylindrical reentrant type of resonant cavity commonly employed in integral resonant cavity klystrons at the present time.
  • klystrons may, of course, have one or more such cavities.
  • the cavity proper is the unshaded space 1 within the metal walls represented in FIGURE 1 by the externally cross-hatched line bounding the space.
  • post 2 As will be seen there is a central upstanding so-called post 2, the top of which faces the top wall 3 which is substantially parallel to and fairly close to the top of the post, the wall 3 being also substantially parallel to, but at a considerably greater distance from, the annular bottom wall 4 round the bottom of the post.
  • the cavity thus formed is, in section, roughly dumb-bell shaped.
  • the walls of a tunable resonant cavity suitable for use in a klystron or like electron discharge tube include two mutually spaced walls connected together and spaced from one another by a of said third wall is deformable to vary its length and therefore to vary the separating distance between said two mutually spaced walls.
  • the tubular wall is circular in shape and the two mutually spaced walls are circular, one of the latter walls comprising an annular portion and a central post portion, the top of which is fairly close to the other wall.
  • the tubular wall is caused to be deformable by constructing it with at least one convolution or bellows-like bend in its length, means being provided for deforming'said bend or convolution to vary the overall length of the whole tubular wall.
  • the means for deforming the'tubular wall comprise means for varying its length symmetrically with respect to the axis so that, in any position of :adjustmenL-the length of said tubular wall, measured along lines parallel to the axis, is the same for all such lines.
  • the adjustment of length is asymmetrical, the length of thetubular wall at one place round the periphery being fixed and means being provided for deforming said wall to vary the length elsewhere.
  • the deforming means may comprise screws or bolts symmetrically arranged round the tubular wall in the case of axially symmetrical adjustment of length or one screw or bolt in the case of axially asymmetrical adjustment of length.
  • FIGURES 2 and 3 show an embodiment, illustrated as applied to a klystron cavity with a waveguide feed to (or from) the cavity wherein the adjustment is axially asymmetrical.
  • the space 1 within the cavity is between two transverse metal walls, namely the centrally apertured wall 3 and a wall formed with a central post 2 surrounded by an annular wall member 4.
  • These transverse metal walls are spaced apart along the length of and are brazed to a circular deformable metal tube 5, part of the length of which, between the transverse walls, is formed with a convolution or bellows-like bend 5A which can be deformed to vary the spacing of the transverse walls.
  • a window plate 7 with a corresponding hole 7A is brazed to the tube 5 so that, at the side where this plate is situated, the length of the tube 5 is rigidly fixed.
  • a waveguide 8 is brazed to the plate 7 and is fitted with a vacuum-retaining mica or glass window (not shown) extending across it to pass high frequency wave energy in accordance with practice known per se.
  • Two lugs 9 and 10 are brazed to the tube 5 near the transverse walls and on the outside of said tube opposite to the location of the plate 7 and waveguide 8.
  • a single screw 11 (shown broken away) fitted with nuts 12 passes through the lugs. As will be apparent, it is possible by means of the screw 11 and nuts 12 to force the lugs 9 and 10 to- 7 3 Wards or away from one the bend SA opposite the waveguide 8 and thus changing another, deforming the part, of
  • transverse walls are a fixed distance apart on the side adjacent the plate 7 but the separating distance on theopposite side is variable.
  • the tube 5 was made.
  • FIGURESf4and 5 The modification shown in FIGURESf4and 5 willbe found largely self-explanatory since like references are used for like parts in FIGURES 2 to.5.
  • two triangular plates 13 'and14 replace the lugs 9 and.10 of FIGURES'Z and 3 and thewindow plate 7 is dispensed with so that the length of the tube is variable in anaxially symmetrical manner. is effected by three symmetrically arranged; screws 15 Such variation fitted With nuts 16 '(thescrews andnuts are not'shovvn in'FIGURES) and connecting the plates 13 and 14 to:
  • FIGURES 4 and 5 aco-axialline feed 17 is shown in place of a waveguide.
  • An electron discharge tube having a tunable resonant cavity comprising, a pair of separated rigid walls, a unirigid walls, said vunitary tubular wall including a deform-' ableiportion disposed between'said rigid walls, said :unitary tubularwall having substantially uniform substantial thick-1 ,ness throughout its, length includingflsaid deformable portion, a pair of spaced body portions extending transversely of and connectedto said unitary tubular Wall on opposite sides' of i said.
  • deformable portion, rand means adjustably connectedsbetween said pair of spaced body portions and adjustable to applytpressurewtot said deformable portion throughtsaid tubular wall to distort: said deformable .portion to a greater on lesser extent tovary .the distance separating said'rigid' Walls,'thereby varying the resonant frequency of the cavity.

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US207546A 1961-09-06 1962-07-05 Deformable wall tuning of resonant cavities for electron discharge tubes Expired - Lifetime US3264513A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31963/61A GB976775A (en) 1961-09-06 1961-09-06 Improvements in or relating to resonant cavities

Publications (1)

Publication Number Publication Date
US3264513A true US3264513A (en) 1966-08-02

Family

ID=10330995

Family Applications (1)

Application Number Title Priority Date Filing Date
US207546A Expired - Lifetime US3264513A (en) 1961-09-06 1962-07-05 Deformable wall tuning of resonant cavities for electron discharge tubes

Country Status (5)

Country Link
US (1) US3264513A (de)
CH (1) CH402198A (de)
DE (1) DE1283972B (de)
FR (1) FR1335274A (de)
GB (1) GB976775A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351805A (en) * 1963-10-15 1967-11-07 Westinghouse Electric Corp Tunable reflex klystron having means to vary the spacing between the first and second grids
US3787748A (en) * 1971-11-04 1974-01-22 Philips Corp Frequency tuner of a resonator for a klystron
US5243310A (en) * 1992-01-27 1993-09-07 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Three point lead screw positioning apparatus for a cavity tuning plate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388289A (en) * 1941-08-08 1945-11-06 Bell Telephone Labor Inc Electron discharge device
US2614233A (en) * 1950-09-15 1952-10-14 Wilbur A Joerndt Ruggedized klystron tube
US2684452A (en) * 1952-07-28 1954-07-20 Eitel Mccullough Inc Electron tube
US2825844A (en) * 1953-12-02 1958-03-04 Sperry Rand Corp Reflex klystron oscillator tube
DE1115841B (de) * 1960-06-01 1961-10-26 Telefunken Patent Vorrichtung zum Abstimmen des Hohlraumresonators einer Roehre fuer sehr hohe Frequenzen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748161C (de) * 1935-06-28 1944-10-27 Elektronenroehrenanordnung zum Anfachen ultrahochfrequenter elektromagnetischer Schwingungen
DE888119C (de) * 1935-06-30 1953-08-31 Julius Pintsch K G Elektronenroehrenanordnung zum Anfachen (Erzeugen, Verstaerken, Empfangen) ultrahochfrequenter elektromagnetischer Schwingungen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388289A (en) * 1941-08-08 1945-11-06 Bell Telephone Labor Inc Electron discharge device
US2614233A (en) * 1950-09-15 1952-10-14 Wilbur A Joerndt Ruggedized klystron tube
US2684452A (en) * 1952-07-28 1954-07-20 Eitel Mccullough Inc Electron tube
US2825844A (en) * 1953-12-02 1958-03-04 Sperry Rand Corp Reflex klystron oscillator tube
DE1115841B (de) * 1960-06-01 1961-10-26 Telefunken Patent Vorrichtung zum Abstimmen des Hohlraumresonators einer Roehre fuer sehr hohe Frequenzen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351805A (en) * 1963-10-15 1967-11-07 Westinghouse Electric Corp Tunable reflex klystron having means to vary the spacing between the first and second grids
US3787748A (en) * 1971-11-04 1974-01-22 Philips Corp Frequency tuner of a resonator for a klystron
US5243310A (en) * 1992-01-27 1993-09-07 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Three point lead screw positioning apparatus for a cavity tuning plate

Also Published As

Publication number Publication date
GB976775A (en) 1964-12-02
DE1283972B (de) 1968-11-28
CH402198A (fr) 1965-11-15
FR1335274A (fr) 1963-08-16

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