US3309561A - Coaxial multipactor switch utilizing magnetic field to control impedance - Google Patents

Coaxial multipactor switch utilizing magnetic field to control impedance Download PDF

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Publication number
US3309561A
US3309561A US255362A US25536263A US3309561A US 3309561 A US3309561 A US 3309561A US 255362 A US255362 A US 255362A US 25536263 A US25536263 A US 25536263A US 3309561 A US3309561 A US 3309561A
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US
United States
Prior art keywords
magnetic field
region
multipactor
coaxial
electrons
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
US255362A
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English (en)
Inventor
Kane John Frederick
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US255362A priority Critical patent/US3309561A/en
Priority to GB50077/63A priority patent/GB1074453A/en
Priority to DEG39627A priority patent/DE1279145B/de
Priority to BE643059D priority patent/BE643059A/xx
Application granted granted Critical
Publication of US3309561A publication Critical patent/US3309561A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/24—Terminating devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/22—Attenuating devices
    • H01P1/23—Attenuating devices using ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/04—Coupling devices of the waveguide type with variable factor of coupling

Definitions

  • a common disadvantage of the prior art mechanical and gaseous variable impedances is their relative slowness of operation.
  • it is common to transmit microwaves in bursts, known as pulses, spaced but a few millionths of a sec-0nd (microseconds) apart, the duration of the bursts frequently being substantially less than one-millionth of a second.
  • it is desirable to be able to alter the value of a microwave impedance in the interval between two successive pulses.
  • the mechanical type variable impedances and switches normally prohibits effective control, or change in operation, in less than one- -thousandth of a second.
  • a hollow coaxial transmission line having concentrically disposed inner and outer conductors for transmitting microwaves therethrough and by providing a variable impedance in the form of a con trollable multipactor discharge between such conductors.
  • a section of the transmission line is evacuated and sealed to maintain a region between the conductors evacuated.
  • the opposing surfaces of the two conductors comprise a material characterized by a secondary emission ratio greater than unity for the energy level of the electromagnetic waves supplied.
  • the relative diameters of the two conductors are chosen to support a multipactor discharge therebetween.
  • a rapid application of the magnetic field provides an equally rapid extinction of the multipactor discharge, whereas a sudden reduction of the magnetic. field provides an equally rapid initiation of the multipactor discharge.
  • a rapidly responding controllable impedance is provided by the unimpeded coaxial line with controllable multipactor discharge, which also provides for transmission of maximum levels of microwave power.
  • the manner of operation of the variable impedance cell will now be described.
  • the operation will first be described in the absence of any magnetic field provided by solenoid 23-.
  • the dashed radial lines represent, at a given instant, the distribution and direction of the electric field component of the electromagnetic energy between the opposed surfaces of conductors 17 and 18 at a particular cross-sectional plane.
  • the electric field illustrated reverses its direction at thousands of megacycles each second.
  • the radial electric field will be directed outwardly, as illustrated in 'FIG. 2a and one half cycle later it will be directed inwardly.
  • a microwave transmission line system comprising a variable impedance cell located between a source and a load, said cell for providing a variable impedance comprising:

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  • Particle Accelerators (AREA)
  • Plasma Technology (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US255362A 1963-01-31 1963-01-31 Coaxial multipactor switch utilizing magnetic field to control impedance Expired - Lifetime US3309561A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US255362A US3309561A (en) 1963-01-31 1963-01-31 Coaxial multipactor switch utilizing magnetic field to control impedance
GB50077/63A GB1074453A (en) 1963-01-31 1963-12-18 Controllable microwave attenuator
DEG39627A DE1279145B (de) 1963-01-31 1964-01-10 Wellenleiterabschnitt mit zwei Leitern mit veraenderbarer Impedanz
BE643059D BE643059A (sh) 1963-01-31 1964-01-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US255362A US3309561A (en) 1963-01-31 1963-01-31 Coaxial multipactor switch utilizing magnetic field to control impedance

Publications (1)

Publication Number Publication Date
US3309561A true US3309561A (en) 1967-03-14

Family

ID=22967975

Family Applications (1)

Application Number Title Priority Date Filing Date
US255362A Expired - Lifetime US3309561A (en) 1963-01-31 1963-01-31 Coaxial multipactor switch utilizing magnetic field to control impedance

Country Status (4)

Country Link
US (1) US3309561A (sh)
BE (1) BE643059A (sh)
DE (1) DE1279145B (sh)
GB (1) GB1074453A (sh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858125A (en) * 1972-07-31 1974-12-31 Westinghouse Electric Corp Receiver protection method and apparatus
US4394622A (en) * 1981-06-03 1983-07-19 Rink John P High voltage coaxial switch

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210034A (en) * 1935-11-08 1940-08-06 Emi Ltd Electron multipler
US2216169A (en) * 1939-03-21 1940-10-01 Roscoe H George Oscillator
US2540537A (en) * 1948-12-18 1951-02-06 Rca Corp Vacuum tube current amplifier
US2646550A (en) * 1948-01-09 1953-07-21 Arthur A Varela Controlled impedance gas discharge device for mechanical transmission mediums

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE957673C (de) * 1957-01-17 Compagnie Generale de TeIegraphie sans FiI, Paris Sende-Empfangs-Schalter für Höchstfrequenzen
DE1077274B (de) * 1957-03-26 1960-03-10 Thomson Houston Comp Francaise Hochfrequenz-Schaltroehre zur selbsttaetigen Sender- und/oder Empfaengerverriegelungin Sende-Empfangs-Anlagen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210034A (en) * 1935-11-08 1940-08-06 Emi Ltd Electron multipler
US2216169A (en) * 1939-03-21 1940-10-01 Roscoe H George Oscillator
US2646550A (en) * 1948-01-09 1953-07-21 Arthur A Varela Controlled impedance gas discharge device for mechanical transmission mediums
US2540537A (en) * 1948-12-18 1951-02-06 Rca Corp Vacuum tube current amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858125A (en) * 1972-07-31 1974-12-31 Westinghouse Electric Corp Receiver protection method and apparatus
US4394622A (en) * 1981-06-03 1983-07-19 Rink John P High voltage coaxial switch

Also Published As

Publication number Publication date
BE643059A (sh) 1964-05-15
GB1074453A (en) 1967-07-05
DE1279145B (de) 1968-10-03

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