US2575804A - Microwave hybrid junction - Google Patents

Microwave hybrid junction Download PDF

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Publication number
US2575804A
US2575804A US789850A US78985047A US2575804A US 2575804 A US2575804 A US 2575804A US 789850 A US789850 A US 789850A US 78985047 A US78985047 A US 78985047A US 2575804 A US2575804 A US 2575804A
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US
United States
Prior art keywords
wave
junction
plane
guide
arms
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
US789850A
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English (en)
Inventor
Harald T Frlis
Willard D Lewis
Le Roy C Tillotson
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 NL646401584A priority Critical patent/NL143611B/xx
Priority to NL85854D priority patent/NL85854C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US789850A priority patent/US2575804A/en
Priority to FR975773D priority patent/FR975773A/fr
Priority to GB31240/48A priority patent/GB664689A/en
Application granted granted Critical
Publication of US2575804A publication Critical patent/US2575804A/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
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/19—Conjugate devices, i.e. devices having at least one port decoupled from one other port of the junction type
    • H01P5/20—Magic-T junctions

Definitions

  • Objects of the invention are to provide types of wave guide junctions and wave guide hybrid structures which will have improved electrical impedance characteristics and convenient mechanical structures.
  • the devices of this invention were especially designed for use as component elements of the hybrid branching filters disclosed and claimed in the copending sole application of W. D. Lewis, Serial No. 789,985, filed December 5, 1947, and assigned to applicants assignee. This application became United States Patent 2,531,447, granted November 28, 1950.
  • the Wave guide junction can be more readily understood, if it be considered to be two short sections of identical rectangular wave guide, brought together at an angle of approximately 20 degrees to form an E-plane junction of V shape with the exterior or base apex of the V truncated.
  • a wave guide of rectangular cross-section is employed in which one cross-sectional dimension is greater than the other.
  • fundamental mode TE1,o waves as defined by S. A. Schelkunoff in his book entitled Electromagnetic Waves, pages 386 to 395, inclusive, with the electric vector parallel with the shorter cross-sectional dimension of the guide.
  • the shorter cross-sectional dimension of the guide is accordingly known as the E-plane dimension and the longer cross-sectional dimension as the H-plane dimension.
  • E-plane and H-plane have collective connotations and include all longitudinal planes within the guide which are parallel with the electric andmagnetic vectors, respectively.
  • the TE1,0 mode wave can be, as is" well known to those skilled in the art, introduced into the guide with the electric vector parallel to either pair of opposing sides, so that one can arbitrarily designate either cross-sectional dimension as the E-plane dimension, whereupon the other cross-sectional dimension becomes, of
  • the I-I-plane dimension In CQIlIlBO-f tion with wave-guidejunctions of the present invention, they are referred to as E-plane junctions because, as is apparent from Figs. 1 to 3, inclusive, of the drawing, the common plane in which the longitudinal axes of the wave-guide sections, forming the junction, lie, is parallel with the direction of the electric vector of a 'I'E1,0 wave propagated in the usual manner through these wave-guide sections, i. e. with the electric vector parallel to the shorter sides of the guide.
  • the inner sides of the arm portions of the E planewave-guide junction of the invention form *the interior apex of the V-shaped structure and terminate at the line of intersection of said inner sides, at which point the structure is, of
  • truncated base along the longitudinal axis to the line of intersection of the inner sides of the arms of the structure, is substantially one-halt wavelength of the lowest frequency of the frequency range to be transmitted through the structure.
  • the portion of the structure included between the truncated base and a plane parallel to the plane of the truncated base, the parallel plane including the line of intersection ofthe inner sidesof the two arms of the structure is defined for the purposes of this application as or throat of the wave-guide,
  • the open end of memberswt is provided with a'flange 408 to facilitate coupling to another wave guide transmission line, or to a terminating device of suitable impedance.
  • member 406 are preferably those of the wave guidesto which 2.290 inches (Ii-plane) and 1.145 inches (E5- plane).
  • output terminations will be precisely opposed in phase.
  • reciprocal relations exist, i. e. if equal powers (voltage wave energies) are introduced in phase into terminations A and B of the junction, the voltage wave energies will combine inthe one of the other pair of terminations (i. e. P and S) which has effectively a parallel connection (i. e. termina tion P) with the terminations A and B.
  • ! can obviously be simply a hollow or open V-shaped member and the coaxial coupler can be constructed in the usual;
  • Member 4" extends into member 400 approximately .4 wavelength from the right. end of bushing M4, and being positioned along the longitudinal axis of member 400, as shown, it constitutes a paralle coupling to the two arms A and B of the truncated V-shaped member 400.
  • the coupling conductor comprising the portion of member 6 extending to.
  • the right of bushing 4 can be supported by a vertical rod, the rod being parallel with the E- plane of the wave guide junction and connecting at its upper end to a short section of coaxial line coupling.
  • the coupling conductor H6 or its equivalent should be situated along the longitudinal axis of the throat portion of the wave guide junction.
  • the device illustrated in Figs. 1, .2 and 3 is a "hybrid" microwave junction device in which the terminations A and B (Fig. 3) are “'conjugately related and terminations S and P (Fig. 3) are also conjugately related.
  • An E-plane wave guide junction for use in the transmission of high frequency electromagnetic wave energy of the TE1,0 fundamental mode, said junction being adapted to join three like wave guides of rectangular cross section, having predetermined E-plane and H-plane dimensions, said junction comprising a V-shaped structure having a throat section and two like arms symmetrically joined to said throat section, the interior or base apex of the V being truncated, said structure being formed by upper and lower truncated V-shaped parallel plane surfaces separated by the H-plane dimension of said wave guides, said upper and lower surfaces being joined by four plane side surfaces perpendicular to said upper and lower surfaces, respectively, two of said side surfaces enclosing the throat portion and forming the outer sides of the two arms respectively, the remaining two of said side surfaces forming the inner sides of the two arms, respectively, and joining each other at the junction plane between said throat portion and said arms, the side surfaces at the truncated end of said V structure and throughout the length.

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  • Constitution Of High-Frequency Heating (AREA)
US789850A 1947-12-05 1947-12-05 Microwave hybrid junction Expired - Lifetime US2575804A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL646401584A NL143611B (nl) 1947-12-05 Werkwijze ter bereiding van in water onoplosbare monoazokleurstoffen, die derivaten zijn van eventueel in de benzeenkernen verder gesubstitueerd 2,4-dinitro2'-acylamino-4'-gesubstitueerd-amino-azobenzeen, alsmede werkwijze voor het verven van synthetische vezels met behulp van deze kleurstoffen.
NL85854D NL85854C (en, 2012) 1947-12-05
US789850A US2575804A (en) 1947-12-05 1947-12-05 Microwave hybrid junction
FR975773D FR975773A (fr) 1947-12-05 1948-12-02 Pièce de raccordement hybride pour ondes ultra-courtes
GB31240/48A GB664689A (en) 1947-12-05 1948-12-02 Improvements in or relating to wave guide junctions for ultra-high frequency electromagnetic waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US789850A US2575804A (en) 1947-12-05 1947-12-05 Microwave hybrid junction

Publications (1)

Publication Number Publication Date
US2575804A true US2575804A (en) 1951-11-20

Family

ID=25148846

Family Applications (1)

Application Number Title Priority Date Filing Date
US789850A Expired - Lifetime US2575804A (en) 1947-12-05 1947-12-05 Microwave hybrid junction

Country Status (4)

Country Link
US (1) US2575804A (en, 2012)
FR (1) FR975773A (en, 2012)
GB (1) GB664689A (en, 2012)
NL (2) NL85854C (en, 2012)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686902A (en) * 1950-07-24 1954-08-17 Bell Telephone Labor Inc Microwave branching arrangement
US2764740A (en) * 1951-03-17 1956-09-25 North American Aviation Inc Folded wave guidet
US2792551A (en) * 1953-04-30 1957-05-14 Sperry Rand Corp Folded hybrid junction
US2849688A (en) * 1952-11-04 1958-08-26 Gen Electric Co Ltd Electromagnetic waveguide systems
US2853683A (en) * 1953-04-30 1958-09-23 Sperry Rand Corp Hybrid junction

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2396044A (en) * 1941-12-10 1946-03-05 Bell Telephone Labor Inc Switching device
US2415242A (en) * 1943-02-25 1947-02-04 Rca Corp Switching in wave guide transmission system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2396044A (en) * 1941-12-10 1946-03-05 Bell Telephone Labor Inc Switching device
US2415242A (en) * 1943-02-25 1947-02-04 Rca Corp Switching in wave guide transmission system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686902A (en) * 1950-07-24 1954-08-17 Bell Telephone Labor Inc Microwave branching arrangement
US2764740A (en) * 1951-03-17 1956-09-25 North American Aviation Inc Folded wave guidet
US2849688A (en) * 1952-11-04 1958-08-26 Gen Electric Co Ltd Electromagnetic waveguide systems
US2792551A (en) * 1953-04-30 1957-05-14 Sperry Rand Corp Folded hybrid junction
US2853683A (en) * 1953-04-30 1958-09-23 Sperry Rand Corp Hybrid junction

Also Published As

Publication number Publication date
GB664689A (en) 1952-01-09
FR975773A (fr) 1951-03-09
NL85854C (en, 2012)
NL143611B (nl)

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