US3500111A - Microwave electron beam tubes - Google Patents

Microwave electron beam tubes Download PDF

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Publication number
US3500111A
US3500111A US635070A US3500111DA US3500111A US 3500111 A US3500111 A US 3500111A US 635070 A US635070 A US 635070A US 3500111D A US3500111D A US 3500111DA US 3500111 A US3500111 A US 3500111A
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US
United States
Prior art keywords
gap
tube
electron beam
metallic
section
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
US635070A
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English (en)
Inventor
Cian Noel O'loughlin
Geoffrey Thomas Clayworth
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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Publication of US3500111A publication Critical patent/US3500111A/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
    • H01J23/14—Leading-in arrangements; Seals therefor
    • H01J23/15—Means for preventing wave energy leakage structurally associated with tube leading-in arrangements, e.g. filters, chokes, attenuating devices
    • 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

Definitions

  • a microwave electron beam tube of the kind in which the high frequency inter-action section is insulated from the collector section by a gap, between the sections, in a tubular member through which the electric beam passes is provided with a metallic member which tncircles the tube in neighbourhood of the gap.
  • This metallic member is electrically connected to the tubular member on one side of the gap and a second metallic member is provided similarly encircling the tube, but connected to the tubular member on the other side of the gap.
  • the metallic members sandwich between them a member of dielectric material so as to constitute a condenser which is outside the evacuated envelope of the tube and is in shunt with the gap.
  • This invention relates to microwave electron beam tubes such as klystrons and travelling wave tubes. More particularly the invention relates to microwave electron beam tubes of the kind in which the so-called body of the tube, i.e. high frequency inter-action section thereof, is insulated from the collector section thereof by a gap across which the electron beam passes on its way to the collector.
  • FIGURE 1 is a schematic and highly simplified representation of a typical known klystron and is provided for purposes of explanation only;
  • FIGURE 2 is a view of an embodiment of the present invention showing a klystron only to the extent necessary to an understanding of the present invention; and
  • FIGURE 3 shows a modification of the klystron of FIGURE 2.
  • Section 1 contains the electron gun from which an electron beam is projected through section 2 to the collector electrode section 3.
  • Section 2 is normally at earth potential whereas section 3 is at a higher potential and good insulation between these sections is necessary.
  • the present invention seeks to overcome the foregoing defects and difficulties in a tube which is constructionally robust, reliable and comparatively cheap and easy to manufacture by factory methods.
  • a microwave electron beam tube of the kind referred to has the gap thereof shunted by a condenser with a dielectric of solid material the electrodes of said condenser being outside the evacuated envelope of the tube and encircling the tube in the neighbourhood of said gap.
  • a microwave electron beam tube of the kind in Which the high frequency interaction section thereof is insulated from the collector section thereof by a gap, situated between said sections, in a metallic tubular member through which the electron beam passes includes a metallic member encircling the tube in the neighbourhood of said gap and electrically connected to said tubular member on one side of said gap, and a second metallic member also encircling the tube in the neighbourhood of said gap but electrically connected to the tubular member on the other side of said gap, said metallic members being spaced apart by and sandwiching between them a member of solid dielectric material, the three members constituting a condenser which has a dielectric of solid material and which is outside the evacuated envelope of the tube and is in shunt with said gap.
  • the three members constituting the condensertwo of them metallic and the third of solid dielectric- may take any of a variety of forms.
  • the members are of plate-like form.
  • they are of tubular or cylindrical form.
  • the metal members are plate members of L section each consisting of an annular portion with a short cylindrical portion extending from the inner edge of the annular portion, and the cylindrical portion of one metallic member is electrically and mechanically united with a metallic annular member in electrical connection with the tubular member on one side of the gap, the cylindrical portion of the other metallic member being electrically connected by a spring contact with a second metallic annular member in electrical connection with the tubular member on the other side of the gap.
  • the collector section, the metallic (normally copper) tube through which the beam passes, the gap, the ceramic cylinder, and the two metallic annular members are referenced 3, 4, 5, 6, 7 and 8 respectively and correspond to the similarly referenced parts of FIGURE 1.
  • the gun section (1 in FIGURE 1) of the tube is not shown and only the end of the collector section 2 of the tube is shown.
  • Fixed on the tubular member 4 at a position between the annular member 8 and the adjacent end of the intersection section 2 is a metal annular member 9.
  • Fixed to the tubular member 4 on the other side of the gap 5 and at a position between the annular member 7 and the collector section 3 is another metal annular member 10 of somewhat smaller diameter than that of the member 9.
  • the outer edge of member 10 is peripherically grooved and a coiled metal spring 11 is seated in the groove.
  • a metal plate member 12 of L section and consisting of an annular portion 12A and a cylindrical portion 123 is fixed, at the outer end of its cylindrical portion to the outer portion of the member 9.
  • a second metal plate member 13 of similar shape to that of the member 12 is spaced from said member 12 by a solid dielectric plate member 14 again of similar shape and which is sandwiched between the members 12 and 13.
  • the inner face of the cylindrical portion of the member 13 is in contact with the spring 11 as shown and thus is in electrical connection with the member 10.
  • the parts 12-14-13 thus constitute a solid dielectric condenser which is outside the evacuated envelope of the tube and can readily be made of adequate capacitance to prevent undesired radiation of high frequency energy from the gap 5 across which it is shunted while the danger of arc-over or short circuiting which exists with the known arrangements hereinbefore described is avoided.
  • the members 13 and 14 are shown cross-hatched.
  • the condenser constituted by the parts 12-14-13 is of plate like form i.e. :he electrodes are, in the main, plates of disc form.
  • the nodification shown in FIGURE 3 will, it is thought, he Largely self-explanatory from the said figure.
  • the condenser constituted by the parts referenced [2, 14' and 13', is of tubular or cylindrical form, the :lectrodes 12, 13 being cylindrical.
  • An improved electron beam tube having an evacuated envelope, a high frequency section, a collector sec- .ion, and a gap situated between said sections in a tubular nember through which an electron beam passes, the im- Jrovement comprising a first metallic member at least )artially encircling the tube and positioned outside said :vacuated envelope in the neighborhood of said gap and :lectrically connected to said tubular member on one side )f said gap, and a second metallic member atleast parially encircling the tube and positioned outside said :vacuated envelope in the neighborhood of said gap and :lectrically connected to the tubular member on the other side of said gap, said members being spaced apart by and sandwiching between them a member of solid dielectric material, the three members constituting a condenser.
  • a tube as claimed in claim 2 wherein the condenser is of plate form.
  • a tube as claimed in claim 2 wherein the condenser is of tubular form.
  • a tube as claimed in claim 3 wherein the metal members are plate members of L section each consisting of an annular portion with a short cylindrical portion extending from the inner edge of the annular portion, and the cylindrical portion of one metallic member is electrically and mechanically united with a metallic annular member in electrical connection with the tubular member on one side of the gap, the cylindrical portion of the other metallic member being electrically connected by a spring contact with a second metallic annular member in electrical connection with the tubular member on the other side side of the gap.

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  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Microwave Tubes (AREA)
  • Ceramic Capacitors (AREA)
US635070A 1966-05-09 1967-05-01 Microwave electron beam tubes Expired - Lifetime US3500111A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20403/66A GB1134424A (en) 1966-05-09 1966-05-09 Improvements in or relating to microwave electron beam tubes

Publications (1)

Publication Number Publication Date
US3500111A true US3500111A (en) 1970-03-10

Family

ID=10145406

Family Applications (1)

Application Number Title Priority Date Filing Date
US635070A Expired - Lifetime US3500111A (en) 1966-05-09 1967-05-01 Microwave electron beam tubes

Country Status (5)

Country Link
US (1) US3500111A (fr)
CH (1) CH449787A (fr)
GB (1) GB1134424A (fr)
NL (1) NL6706457A (fr)
SE (1) SE333780B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852636A (en) * 1972-10-11 1974-12-03 English Electric Valve Co Ltd Klystrons

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274430A (en) * 1963-08-01 1966-09-20 Massachusetts Inst Technology Biased-gap klystron

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274430A (en) * 1963-08-01 1966-09-20 Massachusetts Inst Technology Biased-gap klystron

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852636A (en) * 1972-10-11 1974-12-03 English Electric Valve Co Ltd Klystrons

Also Published As

Publication number Publication date
CH449787A (fr) 1968-01-15
GB1134424A (en) 1968-11-20
DE1541916A1 (de) 1970-04-02
DE1541916B2 (de) 1972-07-20
NL6706457A (fr) 1967-11-10
SE333780B (fr) 1971-03-29

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