US2432094A - Impedance transformer for wave guides - Google Patents

Impedance transformer for wave guides Download PDF

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Publication number
US2432094A
US2432094A US614935A US61493545A US2432094A US 2432094 A US2432094 A US 2432094A US 614935 A US614935 A US 614935A US 61493545 A US61493545 A US 61493545A US 2432094 A US2432094 A US 2432094A
Authority
US
United States
Prior art keywords
guides
section
wave
transverse
rectangular
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
US614935A
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English (en)
Inventor
Fox Arthur Gardner
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories 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 NL73887D priority Critical patent/NL73887C/xx
Priority claimed from US452851A external-priority patent/US2432093A/en
Priority to GB22914/45A priority patent/GB578617A/en
Priority claimed from US610956A external-priority patent/US2607850A/en
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US614935A priority patent/US2432094A/en
Application granted granted Critical
Publication of US2432094A publication Critical patent/US2432094A/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
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
    • H01P5/024—Transitions between lines of the same kind and shape, but with different dimensions between hollow waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/24—Terminating devices

Definitions

  • This invention relates to guided electromagnetic wave transmission and more particularly to impedance transformers for wave guides.
  • the principal object of the invention is to interconnect without appreciable impedance mismatch two rectangular wave guides which difier in characteristic impedance and in one crossse'ctional dimension;
  • a further object is to neutralize the reactance at the ends of a quarterwave impedance transforming section used to connect two such guides.
  • A'uniform metallic sheath with or without a. dielectric filler will serve as a guide for suitable electromagnetic waves.
  • the sheath may be circular, rectangular, or of other shape.
  • the guide acts like a transmission line and has a specific propagation constant and characteristic impedance. For any particular frequency there are an infinite number of cross-sectional sizes and shapes of guide which will have the same characteristic impedance.
  • Shunt reactive elements may be obtained by placing partial obstructions across the wave guide,-
  • a shunt reactive element for dominant transverse electric waves may be obtained by using a transverse metal partition having a slit therein which extends substantially from one side to the other. If the slit is perpendicular to the direction of polarization of the electric field the element is primarily capacitive, and if parallel with the field the element is primarily inductive. rectangular opening in the partition may be proportioned to provide parallel resonance, that is, a high shunt impedance,
  • two rectangular wave guides having cross-sections which are the same in one dimension but diiTer in the other dimension are matched in impedance by interposing a quarter-wave section of rectangular guide having a characteristic impedance which is approximately the geometric mean of the characteristic impedances of the guides to be connected.
  • the equal cross-sectional dimensions of the guides are in the direction perpendicular to the electric field of the dominant transverse electric waves.
  • the proper characteristic impedance for the interposed section may be obtained with a cross-section the dimension of which in the direction perpendicular to the electric field is the same as the common dimension of the connected guides and the other dimension of which is approximately equal to the geometric ean of the unequal cross-sectional dimensions of the guides.
  • the transformer thereactanc'e at each end of the quarter-wave section associated-'with-thechange in cross-section is neutralized by the introduction of a reactance of the same magnitude but of opposite sign.
  • these neutralizing reactanc'es are in the form of-fiaps which constrictthe junction apertures the direction of the equal transverse di mensions and thus conve'rt the apertures into parallel resonant shuntxreactances.
  • Ihe guides 60 and '61 have rectangular cross s'ections of the same width M- butdiifer in the cross-sectional dimensions Ii andirwhich are parallel to the direction of the e1ectric-fie1d E;
  • the characteristic impedance of the section 62' is made approximately the geometric mean of those of the guide fifl and 3
  • said reactive means include means for constricting he op g between said section and one of said guides in the direction perpendicular to said electric field.
  • two rectangular wave guides differing in characteristic impedance and a interposed rectangular section of wave guide, said guides and said section having the same transverse dimension in the direction perpendicular to the electric field of the dominant type of wave to be transmitted, said guides differing in their other transverse dimensions, the other transverse dimension of said section being approximately equal to the geometric mean of said other transverse dimensions of said guides, and said section having a length approximately equal to a quarter wavelength at the mid-band frequency to be transmitted, and means for constricting the openings between said section and each of said guides in the direction perpendicular to said electric field.
  • An impedance transformer for interconnecting two rectangular wave guides which differ in characteristic impedance and in one transverse dimension comprising a section of wave guide having a length approximately equal to an odd multiple of a quarter wavelength at the midband frequency to be transmitted and a characteristic impedance approximately equal to the geometric mean of the characteristic impedances of the guides to be connected and reactive means at each 'end of said section for neutralizing the reactance at that point.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
US614935A 1942-07-30 1945-09-07 Impedance transformer for wave guides Expired - Lifetime US2432094A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL73887D NL73887C (enrdf_load_stackoverflow) 1942-07-30
GB22914/45A GB578617A (en) 1942-07-30 1943-11-05 Improvements in or relating to systems for transmitting guided electromagnetic waves
US614935A US2432094A (en) 1942-07-30 1945-09-07 Impedance transformer for wave guides

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US452851A US2432093A (en) 1942-07-30 1942-07-30 Wave transmission network
US610956A US2607850A (en) 1942-07-30 1945-08-17 Wave guide impedance element
US612680A US2503549A (en) 1942-07-30 1945-08-25 Impedance matching in wave guides
US614937A US2434646A (en) 1942-07-30 1945-09-07 Wave guide branching arrangement
US614935A US2432094A (en) 1942-07-30 1945-09-07 Impedance transformer for wave guides
US614936A US2530691A (en) 1942-07-30 1945-09-07 Wave filter
US789811A US2588226A (en) 1942-07-30 1947-12-05 Wave filter
US266179A US2740094A (en) 1942-07-30 1952-01-12 Wave-guide impedance elements

Publications (1)

Publication Number Publication Date
US2432094A true US2432094A (en) 1947-12-09

Family

ID=27575311

Family Applications (1)

Application Number Title Priority Date Filing Date
US614935A Expired - Lifetime US2432094A (en) 1942-07-30 1945-09-07 Impedance transformer for wave guides

Country Status (3)

Country Link
US (1) US2432094A (enrdf_load_stackoverflow)
GB (1) GB578617A (enrdf_load_stackoverflow)
NL (1) NL73887C (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518665A (en) * 1942-08-22 1950-08-15 Emi Ltd Connector for high-frequency transmission lines and the like
US2576186A (en) * 1946-10-22 1951-11-27 Rca Corp Ultrahigh-frequency coupling device
US2654867A (en) * 1948-10-01 1953-10-06 Emi Ltd Electrical wave band pass circuits
DE1046707B (de) * 1956-01-26 1958-12-18 Western Electric Co Hohlleiter-Transformator
US3509496A (en) * 1967-07-10 1970-04-28 Marconi Co Ltd Liquid power-absorbing loads
US3715635A (en) * 1971-06-25 1973-02-06 Bendix Corp High frequency matched impedance microcircuit holder
US4041420A (en) * 1976-06-30 1977-08-09 Riblet Henry J Shunted stepped waveguide transition
US5670918A (en) * 1994-11-21 1997-09-23 Nec Corporation Waveguide matching circuit having both capacitive susceptance regulating means and inductive materials
US20080303612A1 (en) * 2007-06-07 2008-12-11 Microelectronics Technology Inc. Waveguide structure
CN104078735A (zh) * 2013-03-27 2014-10-01 韩国三重核心株式会社 利用阶梯部和阻挡部的等离子体波导

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6518853B1 (en) * 2001-09-06 2003-02-11 The Boeing Company Wideband compact large step circular waveguide transition apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106769A (en) * 1935-08-23 1938-02-01 American Telephone & Telegraph Transmission of guided waves
US2253503A (en) * 1938-08-06 1941-08-26 Bell Telephone Labor Inc Generation and transmission of high frequency oscillations
US2270416A (en) * 1936-12-23 1942-01-20 Emi Ltd Electrical wave system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106769A (en) * 1935-08-23 1938-02-01 American Telephone & Telegraph Transmission of guided waves
US2270416A (en) * 1936-12-23 1942-01-20 Emi Ltd Electrical wave system
US2253503A (en) * 1938-08-06 1941-08-26 Bell Telephone Labor Inc Generation and transmission of high frequency oscillations

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518665A (en) * 1942-08-22 1950-08-15 Emi Ltd Connector for high-frequency transmission lines and the like
US2576186A (en) * 1946-10-22 1951-11-27 Rca Corp Ultrahigh-frequency coupling device
US2654867A (en) * 1948-10-01 1953-10-06 Emi Ltd Electrical wave band pass circuits
DE1046707B (de) * 1956-01-26 1958-12-18 Western Electric Co Hohlleiter-Transformator
US2960671A (en) * 1956-01-26 1960-11-15 Bell Telephone Labor Inc Electromagnetic wave transducer
US3509496A (en) * 1967-07-10 1970-04-28 Marconi Co Ltd Liquid power-absorbing loads
US3715635A (en) * 1971-06-25 1973-02-06 Bendix Corp High frequency matched impedance microcircuit holder
US4041420A (en) * 1976-06-30 1977-08-09 Riblet Henry J Shunted stepped waveguide transition
US5670918A (en) * 1994-11-21 1997-09-23 Nec Corporation Waveguide matching circuit having both capacitive susceptance regulating means and inductive materials
US5708401A (en) * 1994-11-21 1998-01-13 Nec Corporation Waveguide coaxial converter including susceptance matching means
US20080303612A1 (en) * 2007-06-07 2008-12-11 Microelectronics Technology Inc. Waveguide structure
CN104078735A (zh) * 2013-03-27 2014-10-01 韩国三重核心株式会社 利用阶梯部和阻挡部的等离子体波导
EP2785153A3 (en) * 2013-03-27 2014-11-05 Triple Cores Korea Co., Ltd. Plasma waveguide using step part and block part
CN104078735B (zh) * 2013-03-27 2017-05-24 韩国三重核心株式会社 利用阶梯部和阻挡部的等离子体波导

Also Published As

Publication number Publication date
NL73887C (enrdf_load_stackoverflow)
GB578617A (en) 1946-07-04

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