US2898560A - Output coupling circuit for cavity resonators - Google Patents

Output coupling circuit for cavity resonators Download PDF

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Publication number
US2898560A
US2898560A US704203A US70420357A US2898560A US 2898560 A US2898560 A US 2898560A US 704203 A US704203 A US 704203A US 70420357 A US70420357 A US 70420357A US 2898560 A US2898560 A US 2898560A
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US
United States
Prior art keywords
waveguide
cut
output
magnetron
impedance
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
US704203A
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English (en)
Inventor
Crapuchettes Paul Wythe
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.)
Litton Industries Inc
Original Assignee
Litton Industries Inc
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 to BE524632D priority Critical patent/BE524632A/xx
Priority to GB30093/53A priority patent/GB744715A/en
Priority to FR65482D priority patent/FR65482E/fr
Priority to FR65481D priority patent/FR65481E/fr
Priority to FR67505D priority patent/FR67505E/fr
Priority to FR69033D priority patent/FR69033E/fr
Application filed by Litton Industries Inc filed Critical Litton Industries Inc
Priority to US704203A priority patent/US2898560A/en
Application granted granted Critical
Publication of US2898560A publication Critical patent/US2898560A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices

Definitions

  • a coupling circuit interconnecting two sections of a transmission system having different characteristic impedances.
  • the coupling circuit comprises a wave guide equipped with impedance matching means at either ends thereof to match the impedance of the respective sections of the transmission system.
  • the wave guide is so dimensioned that the normal frequency of the energy transmitted through said system is less than the cut-off frequency of the wave guide.
  • the transfer of real energy through the wave guide is effected by the reflection pro- "ice pokerd by the different impedances at the ends of the wave guide.
  • Fig. 1 illustrates a cross-sectional view through a multicavity magnetron anode and the output wave guide coupler illustrating the construction of the output coupler in accordance with my invention
  • Fig. 2 is a perspective view showing in particular a feature of my invention
  • Fig. 3 is a frequency-impedance curve of a cut-off wave guide
  • Fig. 4 is a graph computed from experimental data showing the efficiency using my invention as compared with the prior art.
  • a magnetron having an exciting cathode 1 disposed centrally of a cylindrical anode 2.
  • a plurality of radially disposed vanes 3 are fastened at one end to the anode wall 2 to provide successive adjacent cavity resonators.
  • an output wave guide 4 comprising a conductive outer wall member 5 which may be cylindrical or any other shape and sealed at one end 6 to the wall section 2.
  • the cathode leads and the cylindrical section usually surrounding the anode wall are not shown.
  • the magnetron resonator and the output transmission system are coupled by means of an opening such as slit 7 made in the wall 2.
  • This slit 7 is longitudinally disposed in the cylindrical wall 2 at a radial or non-radial angle, depending on the design of the magnetron.
  • Impedance transformer ramps 8 may be employed to control the impedance of the wave guide with respect to the impedance of the magnetron oscillator as described in my Patent No. 2,555,349, filed August 18, 1948 and issued on June 5, 1951.
  • the output transmission system of the magnetron further includes a waveguide section 9 which is dimensional below cutoff at the operating frequency of the magnetron.
  • the cut-off waveguide section 9 is similar to a conventional waveguide iris, the distinction between an iris and a section of cut-off waveguide being that the latter has a finite length in the direction of propagation whereas an iris has no length for practical purposes.
  • the cut-off waveguide section as it relates to the operation of the magnetron. It is known that the attenuation factor in the propagation constant of a cut-off waveguide is real rather than imaginary as it is in a conducting waveguide, the frequency versus impedance curve for a cut-off waveguide being shown in Fig. 3 from which it may be seen thatthe impedance of the waveguide decreases as the frequency approachescut-oif level. It is also known'that the nature of magnetron operation is such that a fixed electrode geometry 'tends to require a load impedance which varies approximately as frequencysquared.
  • the characteristic curve of the cut-01f waveguide-most nearly fills this requirement.
  • the irisring or cut-off waveguide is provided, which may be positioned either adjacent the magnetrons anode-wall, as shown in Fig. 1, or may be further removed from the-magnetron sandwiched between portions of the ramp sections 8.
  • the openingin-the cut off waveguide 9 is. chosen to formthe proper impedance in the waveguide whereby the magnetron efiiciency-curve is in the position-substantially as shown-at' D, in Fig; 4.
  • the attenuation in the output transmission system is thus determined by the dimensionsof the cut-off waveguide, together-With the terminating impedance which is shown illustratively in Fig. l by the bloclcdesignated 10. It should be noted at-this point that the-cross-sectional dimension of the cut-off waveguide will determine its cut-off frequency and its attenuation per'unit length; accordinglyit isapparent that the attenuation ofiacut-off guide and its variation with frequency may be'controlled by control-ling its crosssectional dimen'sionand-length.
  • an output transformer system can be designed, based'upon dimensionalcontrol limitations or. any other selected criteria, for transmitting energy beyond the cut-off waveguide.
  • the conductance and susceptance ofthe chosen output transformer system may then be calculated, after whichthe desireddecouplingto be provided by't-he cut-off waveguide may be determined, the decoupling being the ratio of the desired.sendingendconductance'to-the-load or; output conductance.
  • the selection of the cross-sectional dimension of the cut-off guide-then also defines its surge admittance (yo), and thus will determine what additional matching susceptance should be shunted across the input tothe cut-off guide to providethedesiredimpedance to the cavity resonator.
  • An output coupling circuit for a multi-cavity resonator magnetron wherein the magnetron resonators are formed by a plurality of radially disposed vanes connected to an outer cylindrical wall, said output coupling comprising an output structure including longitudinal conductive walls sealed at one end to said cylindrical outer wall, said magnetron wall having a communicating slit between one of said resonators and the interior of said wave guide; a pair ofoppositely disposed ramps affixed-to saidlongitudinal conductive wall to provide a conductingoutput waveguide; and an apertured conductive block positioned in said output structure and forming a com municating'openingbetween saidramps and said slit, the aperture in said block forming awave guide dimensionedbelow cut-off at the resonant frequency of said cavity resonators to provide a frequency sensitive decoupling impedance betweensaid cavity resonators and said con- 7 ducting output waveguide.
  • a broadband output structure for extracting energy from a tunable multi-cavity resonator magnetron, said output structure comprising: a section of-waveguideof predetermined length and internal cross-sectional dimensionspositionedadjacent one of said cavity resonators, said waveguide having a cut-off frequency higher than the resonant frequency of the cavity resonators; input means for transmitting electrical energy from said one cavity resonator to one end of said cut-off waveguide; and output means forming a reflective terminationat the other end of'said cut-off waveguide to permit energy to propogate through said cut-oh" waveguide, said output means including a section of ridged conducting waveguide in which the ridges are formedby a pair of tapered ramp members disposed on opposite sides of said conducting waveguide, the convergent end of said ramps being contiguous with said other end of said cut-elf waveguide.
  • a microwave oscillator including a tunable cavity resonator having an aperture for extracting energy there; from, an energy transfer circuit to permit highly eflig cientopera'tion of said resonator over its frejquency range by presenting a frequency dependent output impedance
  • said energy transfer circuit comprising: a'waveguide connected at one end to said resonator and positioned to receive energy, through said aperture, said waveguide being cross-sectionally dimensioned below cut-off over the frequency range of said resonator; a conducting output waveguide connected to the other end of said cut; off waveguide; and means forming a non-dissipative reflecting' transition between said cut-off waveguide and said output waveguide, the length andcross-sectionaldimensions of said cut-off waveguide being selected'to provide anoutput impedance to the cavity resonator of the desired magnitude and frequency dependence.
  • an output coupling circuit comprising: a section of waveguide dimensioned below cut-01f over the operating frequency range of the microwave source, said waveguide section being connected at one end to the microwave source and at the other end to the output waveguide; and means forming a non-dissipative reflecting transition between said other end of said waveguide sec- 10 2,407,267

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  • Microwave Tubes (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US704203A 1950-12-18 1957-12-20 Output coupling circuit for cavity resonators Expired - Lifetime US2898560A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE524632D BE524632A (xx) 1952-11-29
GB30093/53A GB744715A (en) 1952-11-29 1953-10-30 Coupling circuit for high frequency transmission systems
FR65482D FR65482E (fr) 1950-12-18 1953-11-25 Dispositifs d'accord pour magnétron
FR65481D FR65481E (fr) 1950-12-18 1953-11-25 Dispositifs d'accord pour magnétron
FR67505D FR67505E (fr) 1950-12-18 1955-01-28 Dispositifs d'accord pour magnétron
FR69033D FR69033E (fr) 1950-12-18 1955-09-08 Dispositifs d'accord pour magnétron
US704203A US2898560A (en) 1952-11-29 1957-12-20 Output coupling circuit for cavity resonators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32326852A 1952-11-29 1952-11-29
US704203A US2898560A (en) 1952-11-29 1957-12-20 Output coupling circuit for cavity resonators

Publications (1)

Publication Number Publication Date
US2898560A true US2898560A (en) 1959-08-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US704203A Expired - Lifetime US2898560A (en) 1950-12-18 1957-12-20 Output coupling circuit for cavity resonators

Country Status (3)

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US (1) US2898560A (xx)
BE (1) BE524632A (xx)
GB (1) GB744715A (xx)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407267A (en) * 1943-03-05 1946-09-10 Sperry Gyroscope Co Inc Ultra high frequency attenuator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407267A (en) * 1943-03-05 1946-09-10 Sperry Gyroscope Co Inc Ultra high frequency attenuator

Also Published As

Publication number Publication date
BE524632A (xx)
GB744715A (en) 1956-02-15

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