US2710946A - Supports for microwave transmission lines - Google Patents

Supports for microwave transmission lines Download PDF

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Publication number
US2710946A
US2710946A US232102A US23210251A US2710946A US 2710946 A US2710946 A US 2710946A US 232102 A US232102 A US 232102A US 23210251 A US23210251 A US 23210251A US 2710946 A US2710946 A US 2710946A
Authority
US
United States
Prior art keywords
conductor
line
conductors
supports
microwave transmission
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
US232102A
Other languages
English (en)
Inventor
Donald D Grieg
Herbert F Engelmann
John A Kostriza
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.)
TDK Micronas GmbH
International Telephone and Telegraph Corp
Original Assignee
Deutsche ITT Industries GmbH
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 BE512177D priority Critical patent/BE512177A/xx
Priority to BE512422D priority patent/BE512422A/xx
Priority to NLAANVRAGE6903864,A priority patent/NL170359B/xx
Priority to NL92839D priority patent/NL92839C/xx
Priority to NL94989D priority patent/NL94989C/xx
Priority to US232102A priority patent/US2710946A/en
Application filed by Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
Priority to US234319A priority patent/US2721309A/en
Priority to ES0203823A priority patent/ES203823A1/es
Priority to GB14955/52A priority patent/GB708596A/en
Priority to FR64854D priority patent/FR64854E/fr
Priority to CH316041D priority patent/CH316041A/fr
Priority to FR64856D priority patent/FR64856E/fr
Priority to CH319083D priority patent/CH319083A/fr
Priority to GB1337/53A priority patent/GB718957A/en
Application granted granted Critical
Publication of US2710946A publication Critical patent/US2710946A/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
    • H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
    • H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/22—Attenuating devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
    • H01P3/08—Microstrips; Strip lines
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/24—Frequency- independent attenuators

Definitions

  • This invention relates to microwave transmission lines and more particularly to supports therefor.
  • the new system employs, usually, two conductors, one as a ground conductor and the other as a line conductor spaced close together in substantially parallel relation.
  • the so-called ground conductor which may be at ground potential or some other given potential, is considerably wider than the line conductor so that the surface thereof provides in effect an image reflection of the line conductor, whereby the distribution of the electric and magnetic fields between the conductors is substantially the same as the distribution between one conductor and the neutral plane of a two-conductor parallel system.
  • the object of the present invention is to provide supporting elements either of insulation or of conductive material to maintain the two conductors of the system described above in proper spaced relation.
  • Fig. 1 is a view in side elevation with parts broken away in section to show a transmission line-ground conductor system with one form of support in accordance with the principles of the present invention
  • Fig. 2 is a cross-sectional View taken along line 22 of Fig. 1;
  • Fig. 3 is a similar cross-sectional view showing a modified form of support
  • Figs. 4 and 5 are views in side elevation with parts broken away showing two other forms of support utilizing conductive material as the support;
  • Figs. 6 and 7 are cross-sectional views of the transmission line showing two additional forms of support that may use conductive material.
  • the microwave transmission system illustrated comprises a first or line conductor 1 and a second or ground conductor 2.
  • the microwave transmission system illustrated comprises a first or line conductor 1 and a second or ground conductor 2.
  • ground conductor is preferably of sheet or ribbon form, although other forms may be used, having a width considerably greater than the width of the line conductor 1.
  • the conductor 2 may comprise one of the walls of a chassis or other part of the electric apparatus with which or in which the transmission system is used.
  • the ground conductor 2 may extend a considerable distance laterally with respect to the line conductor but for practical purposes the width of the ground conductor may be twice or three times the width of the line conductor.
  • the purpose of having the ground conductor of a width two to three times greater than the width of the line conductor is to provide in effect an image reflection of the line conductor so that the distribution of the electric and magnetic fields between the conductors is similar to the distribution between one conductor and the neutral plane of a two-conductor parallel system.
  • Microwave energy may be launched onto the lineground conductor system by any suitable means, a coaxial line 3, 4 being shown by way of illustration as one satisfactory form of launching device.
  • the outer conductor 3 of the coaxial line is countersunk with respect to the upper surface of the conductor 2 so as to bring the inner conductor 4 into alignment with the line conductor 1.
  • the reason for the counter-sinking is that the spacing between the conductors 1 and 2 for a given characteristic impedance is usually smaller than the spacing between the inner and outer conductors of the coaxial line of corresponding impedance.
  • the spacing between conductors 1 and 2 may be the same as the spacing between the inner and outer conductors for a given impedance characteristic.
  • the outer conductor 3 is connected to the ground conductor 2 as indicated at 5.
  • the discontinuity between the shape of the outer conductor 3 and the ground conductor 2 may cause some perturbation of the waves.
  • the dielectric bead 6 at the end of the coaxial line is so selected with regard to size and dielectric quality as to overcome the effects of this discontinuity.
  • the line conductor 1 extends some distance to a utilization device 7 as indicated in Fig. 1, the line may sag unsymmetrically thereby varying unevenly the spacing between the conductors 1 and 2.
  • one or more supports of the forms herein disclosed may be employed.
  • a body of insulating material 8 having a recess 9 in the upper surface thereof of a size and shape to receive the conductor 1 may be used.
  • the body 3 may be of a size corresponding to the desired spacing between the conductors or it may be of a size considerably smaller than the spacing.
  • the line conductor 1 may be provided with symmetrical transformer sections 10 and 11 of lengths equal substantially to a half wavelength of multiples thereof, thereby reducing the spacing between the conductors at the support.
  • the body 8 may be secured to the ground conductor 2 or to the line conductor 1 or to both by any suitable adherent material.
  • the body of insulating material is shown in the form of a bead 12 adapted to surround the line conductor 1.
  • the bead may be preformed of ceramic or other material and threaded onto the line conductor 1, or it may be formed onto the conductor 1 as a plastic material.
  • the supports shown in Figs. 4 and 5 comprise a supporting element 13 in the form of a rod of conductive material.
  • the rod 13 is selected of a length corresponding substantially to one-quarter or an odd multiple of quarter wavelengths of the mid frequency of the microwave energy propagated over the system. This length provides the appearance at the connection to the conductors of an open circuit.
  • the connection of the elements may be made by brazing, soldering or by any other suitable means.
  • the spacing between the conductors 1 and 2 is usually considerably less than a quarter wavelength thereby requiring some provision to accommodate the quarter wave support.
  • the line conductor 1 is provided with a symmetrical transformer shape 14, 15 varying from a given spacing normally employed along the line-ground conductor system to the one-quarter spacing at the support element 13.
  • a cup-shaped recess 16 is formed in the ground conductor 2a suflicient to accommodate the quarter-wavelength support 13. Should the ground conductor 2a be too thin to accommodate the recess 16, a depending sleeve may be provided which would correspond to the cup-shaped recess 16.
  • symmetrical supporting elements are provided for the line conductor.
  • the line conductor may preferably be fiat as indicated at In, thus insuring a high concentration of flux between the opposing surfaces of the line-ground conductor system.
  • the supporting element shown in Fig. 6 comprises two support elements 17 and 18 which are selected length equal substantially to a quarter or an odd multiple of quarter wavelengths and are disposed laterally with respect to the ground conductor 1a. These elements 17 and 18, however, need not be at right angles to the conductor 1a but may be disposed in any desired angular relationship.
  • the symmetrical supporting arrangement comprises two legs 19 and 20 which together form an inverted U-shaped bracket.
  • the legs 19 and 20 of the bracket are supported on the ground conductor 2 and the line conductor 1a is brazed, soldered or otherwise secured to the cross piece 21 of the bracket. While the conductor 1a of Figs. 6 and 7 is shown rectangular in cross-section, it may be of any cross-sectional shape desired. Likewise, the shapes of the line conductors shown in Figs. 1 to may be rectangular or of other shapes as may be desired.
  • a U-shaped supporting bracket of conductive material straddling said first conductor with the legs thereof in engagement with said second conductor and the mid portion secured to the side of said first conductor facing away from said second conductor whereby the space between said first and second conductors is free of conductive material, each of the legs of said U-shaped bracket plus a portion of the cross piece of the bracket being equal to approximately a quarter wavelength or an odd multiple thereof of the mid frequency of the microwave energy propagated along said system.
  • first and second conductors are of ribbon-like cross-section and the legs of the U-shaped bracket extend laterally of the side edges of said first conductor.

Landscapes

  • Communication Cables (AREA)
  • Waveguides (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US232102A 1951-05-23 1951-06-18 Supports for microwave transmission lines Expired - Lifetime US2710946A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
BE512177D BE512177A (en, 2012) 1951-06-18
BE512422D BE512422A (en, 2012) 1951-06-18
NLAANVRAGE6903864,A NL170359B (nl) 1951-06-18 Radiotelefoonstelsel met impulsmodulatie.
NL92839D NL92839C (en, 2012) 1951-06-18
NL94989D NL94989C (en, 2012) 1951-06-18
US232102A US2710946A (en) 1951-06-18 1951-06-18 Supports for microwave transmission lines
US234319A US2721309A (en) 1951-06-18 1951-06-29 Directional couplers for microwave transmission systems
ES0203823A ES203823A1 (es) 1951-06-18 1952-06-03 SOPORTES PARA LiNEAS DE TRANSMISIoN DE MICROONDAS
GB14955/52A GB708596A (en) 1951-06-18 1952-06-13 Support for microwave transmission lines
FR64854D FR64854E (fr) 1951-05-23 1952-06-17 Système de transmission pour haute fréquence
CH316041D CH316041A (fr) 1951-06-18 1952-06-18 Dispositif de transmission d'ondes ultra-courtes
FR64856D FR64856E (fr) 1951-05-23 1952-06-27 Système de transmission pour haute fréquence
CH319083D CH319083A (fr) 1951-06-18 1952-06-28 Dispositif de couplage pour une installation de transmission à ondes ultra-courtes
GB1337/53A GB718957A (en) 1951-06-18 1953-01-16 Microwave coupling arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US232102A US2710946A (en) 1951-06-18 1951-06-18 Supports for microwave transmission lines

Publications (1)

Publication Number Publication Date
US2710946A true US2710946A (en) 1955-06-14

Family

ID=22871881

Family Applications (1)

Application Number Title Priority Date Filing Date
US232102A Expired - Lifetime US2710946A (en) 1951-05-23 1951-06-18 Supports for microwave transmission lines

Country Status (6)

Country Link
US (1) US2710946A (en, 2012)
BE (2) BE512177A (en, 2012)
CH (2) CH316041A (en, 2012)
ES (1) ES203823A1 (en, 2012)
GB (2) GB708596A (en, 2012)
NL (3) NL94989C (en, 2012)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820206A (en) * 1952-05-08 1958-01-14 Itt Microwave filters
US2867782A (en) * 1955-05-13 1959-01-06 Itt Microwave lines and high q filters
US2961623A (en) * 1960-11-22 Movable support means for center
US3786375A (en) * 1970-04-27 1974-01-15 Hitachi Ltd Package for mounting semiconductor device in microstrip line
US11063347B2 (en) * 2017-04-11 2021-07-13 Denso Corporation In-cabin communication system comprised of a leaky coaxial cable fixed to a vehicle body

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB828241A (en) * 1957-02-22 1960-02-17 Standard Telephones Cables Ltd Microwave directional coupler
US3303439A (en) * 1965-06-14 1967-02-07 Western Electric Co Strip transmission line interboard connection

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924115A (en) * 1930-04-08 1933-08-29 Bell Telephone Labor Inc Protective means for electrical systems
US2121855A (en) * 1934-07-05 1938-06-28 Telefunken Gmbh Coupling high-frequency apparatus
US2159648A (en) * 1937-09-08 1939-05-23 Mackay Radio & Telegraph Co Transmission modifying network
US2409449A (en) * 1943-12-30 1946-10-15 Rca Corp Phase modulator
US2421137A (en) * 1945-06-01 1947-05-27 Hazeltine Research Inc Transmission line
US2611822A (en) * 1945-02-03 1952-09-23 Bliss William Roderic Coupling device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924115A (en) * 1930-04-08 1933-08-29 Bell Telephone Labor Inc Protective means for electrical systems
US2121855A (en) * 1934-07-05 1938-06-28 Telefunken Gmbh Coupling high-frequency apparatus
US2159648A (en) * 1937-09-08 1939-05-23 Mackay Radio & Telegraph Co Transmission modifying network
US2409449A (en) * 1943-12-30 1946-10-15 Rca Corp Phase modulator
US2611822A (en) * 1945-02-03 1952-09-23 Bliss William Roderic Coupling device
US2421137A (en) * 1945-06-01 1947-05-27 Hazeltine Research Inc Transmission line

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2961623A (en) * 1960-11-22 Movable support means for center
US2820206A (en) * 1952-05-08 1958-01-14 Itt Microwave filters
US2867782A (en) * 1955-05-13 1959-01-06 Itt Microwave lines and high q filters
US3786375A (en) * 1970-04-27 1974-01-15 Hitachi Ltd Package for mounting semiconductor device in microstrip line
US11063347B2 (en) * 2017-04-11 2021-07-13 Denso Corporation In-cabin communication system comprised of a leaky coaxial cable fixed to a vehicle body

Also Published As

Publication number Publication date
ES203823A1 (es) 1952-07-01
NL92839C (en, 2012)
NL94989C (en, 2012)
BE512422A (en, 2012)
GB708596A (en) 1954-05-05
BE512177A (en, 2012)
NL170359B (nl)
GB718957A (en) 1954-11-24
CH319083A (fr) 1957-01-31
CH316041A (fr) 1956-09-15

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