US2810892A - Transmission line - Google Patents

Transmission line Download PDF

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Publication number
US2810892A
US2810892A US414293A US41429354A US2810892A US 2810892 A US2810892 A US 2810892A US 414293 A US414293 A US 414293A US 41429354 A US41429354 A US 41429354A US 2810892 A US2810892 A US 2810892A
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US
United States
Prior art keywords
conductors
transmission line
conductor
pair
line
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
US414293A
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English (en)
Inventor
Blitz Daniel
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.)
Lockheed Martin Corp
Original Assignee
Sanders Associates 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 NL202113D priority Critical patent/NL202113A/xx
Application filed by Sanders Associates Inc filed Critical Sanders Associates Inc
Priority to US414293A priority patent/US2810892A/en
Application granted granted Critical
Publication of US2810892A publication Critical patent/US2810892A/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
    • 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
    • H01P3/085—Triplate lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0237—High frequency adaptations
    • H05K1/0245—Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09672—Superposed layout, i.e. in different planes

Definitions

  • the present invention relates to transmission lines. More particularly, the invention relates to transmission lines such as are used in association with high frequency electronic devices.
  • wave guides In modern shortwave techniques transmission lines in a form familiarly known as wave guides are widely used. Because of the construction these wave guides occupy a large volume of space and are heavy and expensive to manufacture.
  • a so-called sandwic line has been proposed in which a pair of ground plane, outer conductors have sandwiched between them an inner conductor of lesser width.
  • These sandwich lines are typically prepared from a pair of copper-foil-clad, T eflon- Fiberglas laminates.
  • the transmission line is formed from two lamination sections one of which is composed from an elongated, Teflon-Fiberglas insulating panel hav ing a ground conductor aifixed to one flat side and an etched inner conductor affixed to the opposite, flat side.
  • the other section has only an insulating panel and a ground conductor.
  • the two transmission line sections are typically assembled together with the inner conductor sandwiched between the two outer conductors by means of rivets or clamps.
  • Such a line is subject to asymmetries in the ground-conductor-to-inner conductor spacings due to flexure or vibration.
  • the spacing from the inner conductor to each of the outer conductors must be equal for the line to remain balanced and to maintain a constant characteristic impedance.
  • the characteristic impedance is radically changed and causes reflections and resultant increased insertion losses.
  • the lamination sections are each composed of an outer conductor, an insulating panel and an inner conductor.
  • the two sections When used as a unitary, composite, transmission line, the two sections are assembled together with the, inner conductors connected together.
  • the inner conductor-to-outer conductor spacings are preserved and maintained constant regardless of limited relative motion between the inner conductors and, hence, between lamination sections.
  • an object of the invention to provide an improved transmission line in which relative movement of its parts has substantially no effect on the propagation characteristics of the line.
  • a further object of the invention is to provide an improved transmission line which is economical to fabricate and light in weight.
  • Yet another object of the invention is to provide an 2 improved transmission line exhibiting a high degree of reliability and reproducibility.
  • Fig. 1 is a three-dimensional view illustrating an embodiment of this invention
  • Fig. 2 is a view illustrating the connection of a source of high frequency power to a transmission line embodying this invention.
  • an outer conductor 1 is attached to the upper surface of a dielectric 2 with a suitable cement.
  • A11 inner conductor 3 is attached to the under surface of the dielectric 2.
  • An inner conductor 4 is attached to the upper surface of a dielectric 5 and an outer conductor 6 is attached to its under surface.
  • a generator 7 may be connected to the transmission line embodying this invention as shown in Fig. 2. One side of the generator 7 may be connected to ground and to the outer conductors 1 and 6. The other side of generator 7 may be connected to the inner conductors 3 and 4.
  • a transmission line composed of inner conductors of finite width and spaced between outer conductors that are parallel and of infinite width would permit no radiation of high frequency energy from the line.
  • the width of the outer conductors By selecting the width of the outer conductors to be sufliciently greater than that of the inner conductors, a relatively low radiation loss is obtained for the transmission line.
  • the two sections may be permitted transversely to move relative to each other a limited amount in the direction indicated at 8.
  • the effect of the present invention is substantially to preserve the impedance characteristics of the line in the presence of such motion.
  • a relatively small phase shift may be introduced by the transverse relative movement of a section of line; for example, less than 30 degrees. Ordinarily, such a shift is unobjectionable and it sometimes may be utilized.
  • Another embodiment of the invention permits an extra degree of limited transverse motion between two sections of the transmission line, in the direction as indicated at 9.
  • a composite, unitary, high-frequency, electric, transmission line structure susceptible to flexure of its parts comprising: a pair of elongated outer conductors providing electrical ground planes; a pair of elongated inner conductors, held adjacent each other, and in electrical contact between and in spaced insulated relation to Said outer conductors, to operate electrically as a single conductor, while permitting variation of'the spacing between said inner conductors Without substantially disturbing the electric energy propagation efiiciency of said transmission line; and means securing said conductors in their relative positions. 7 g 2.
  • a composite, unitary, high-frequency, electric, transmission line susceptible to flexure of its parts comprising: a pair of parallel, outer conductors providing electrical ground planes; a pair of inner conductors so connected as to operate electrically as a single conductor to permit variations of the spacing between the inner. conductors without substantially disturbing the propagation efficiency of said transmission line, said inner conductors being narrower than said outer conductors; and means'securing said conductors in their relative positions to confine propagated electric energy'within the limits of said outer conductors.
  • a composite, unitary, high-frequency, electric, transmission line structure susceptible to fiexure of its parts comprising: a pair of elongated outer conductors providing electrical ground planes; a pair of inner conductors, one of said inner conductors being narrower than the otherof said inner conductors, said inner conductors being connected together to operate electrically as .a single conductor, while permitting variation of the spacing between said inner conductors without substantially disturbing the electric energy propagation elficiency of said transmission line; and means securing said conductors intheir relative positions.
  • a composite, unitary, high-frequency, transmission line structure susceptible to flexure of its parts comprising: a first pair of elongated parallel conductors; dielectric material binding said conductors in insulated spaced relation; a second pair of elongated electric; 1
  • transmission'line structure susceptible to fleXure of its parts, comprising: a first pair of elongated parallelconductors; dielectric material binding said conductors in insulated spaced relation; a second pair of elongated conductors; and dielectric material binding the conductors of said second pair together in insulated spaced relation, said first and second conductor pairsbeing held parallel to and adjacent each other to provide apair of outer con ductors providing two substantially infinite electrical ground planes and a pair of adjacent inner conductors, said inner conductors being so connected as to operate electrically as a single conductor while permitting lim- 'ited transverse movement between said inner conductors without substantially disturbing the propagation efliciency of said line.
  • a second lamination section having an elongated insulator panel, an elongated,: planar, outer conductor af-V gether as a single conductor, whereby the inner-conductor-to-outer-conductor spacings are maintained constant with variations of the spacing between said sections, thereby maintaining the propagation characteristics of said transmission line substantially constant and enabling said line to operate as a unitary guide for high-frequency, electric energy within the confinesof said outer conductors.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Insulated Conductors (AREA)
US414293A 1954-03-05 1954-03-05 Transmission line Expired - Lifetime US2810892A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL202113D NL202113A (enrdf_load_stackoverflow) 1954-03-05
US414293A US2810892A (en) 1954-03-05 1954-03-05 Transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US414293A US2810892A (en) 1954-03-05 1954-03-05 Transmission line

Publications (1)

Publication Number Publication Date
US2810892A true US2810892A (en) 1957-10-22

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Family Applications (1)

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US414293A Expired - Lifetime US2810892A (en) 1954-03-05 1954-03-05 Transmission line

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US (1) US2810892A (enrdf_load_stackoverflow)
NL (1) NL202113A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913686A (en) * 1953-09-17 1959-11-17 Cutler Hammer Inc Strip transmission lines
US2926317A (en) * 1954-03-11 1960-02-23 Sanders Associates Inc Transmission line
US2961620A (en) * 1955-10-06 1960-11-22 Sanders Associates Inc Phase shifter for high frequency transmission line
US3091655A (en) * 1959-07-03 1963-05-28 Philips Corp High-frequency current conductor
US3120992A (en) * 1960-06-16 1964-02-11 Hollingsworth R Lee Automobile traffic surveillance apparatus and speed measurement equipment
US3221331A (en) * 1961-12-29 1965-11-30 Csf Leaky surface-wave antenna with distributed excitation
US3405375A (en) * 1966-05-24 1968-10-08 Army Usa Stripline variable phase shifter having means to maintain a constant characteristic impedance
US3470469A (en) * 1963-08-07 1969-09-30 Sanders Associates Inc Slotted strip transmission line using probe to measure characteristics of the line
US3740678A (en) * 1971-03-19 1973-06-19 Ibm Strip transmission line structures
JPS63190404A (ja) * 1987-02-02 1988-08-08 Murata Mfg Co Ltd ストリツプライン
US4785271A (en) * 1987-11-24 1988-11-15 Motorola, Inc. Stripline filter with improved resonator structure
US4809153A (en) * 1986-03-18 1989-02-28 Siemens Aktiengesellschaft Low-inductance bus bar arrangement
US4916417A (en) * 1985-09-24 1990-04-10 Murata Mfg. Co., Ltd. Microstripline filter
US5473296A (en) * 1993-03-05 1995-12-05 Murata Manufacturing Co., Ltd. Nonradiative dielectric waveguide and manufacturing method thereof
WO1998024141A1 (en) * 1996-11-26 1998-06-04 Raytheon Company Alignment tolerant overlay directional coupler
US6568067B2 (en) * 2000-02-10 2003-05-27 Murata Manufacturing Co., Ltd. Method of manufacturing the dielectric waveguide
US10488157B1 (en) * 1976-06-02 2019-11-26 Raytheon Company Dual mode seeker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB541380A (en) * 1940-03-08 1941-11-25 Standard Telephones Cables Ltd Improvements in or relating to electric transmission networks
GB570087A (en) * 1943-05-26 1945-06-21 Gen Electric Co Ltd Improvements in electrical transmission lines
GB601514A (en) * 1939-09-01 1948-05-07 Cole E K Ltd Improvements in resonant electric artificial lines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB601514A (en) * 1939-09-01 1948-05-07 Cole E K Ltd Improvements in resonant electric artificial lines
GB541380A (en) * 1940-03-08 1941-11-25 Standard Telephones Cables Ltd Improvements in or relating to electric transmission networks
GB570087A (en) * 1943-05-26 1945-06-21 Gen Electric Co Ltd Improvements in electrical transmission lines

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913686A (en) * 1953-09-17 1959-11-17 Cutler Hammer Inc Strip transmission lines
US2926317A (en) * 1954-03-11 1960-02-23 Sanders Associates Inc Transmission line
US2961620A (en) * 1955-10-06 1960-11-22 Sanders Associates Inc Phase shifter for high frequency transmission line
US3091655A (en) * 1959-07-03 1963-05-28 Philips Corp High-frequency current conductor
US3120992A (en) * 1960-06-16 1964-02-11 Hollingsworth R Lee Automobile traffic surveillance apparatus and speed measurement equipment
US3221331A (en) * 1961-12-29 1965-11-30 Csf Leaky surface-wave antenna with distributed excitation
US3470469A (en) * 1963-08-07 1969-09-30 Sanders Associates Inc Slotted strip transmission line using probe to measure characteristics of the line
US3405375A (en) * 1966-05-24 1968-10-08 Army Usa Stripline variable phase shifter having means to maintain a constant characteristic impedance
US3740678A (en) * 1971-03-19 1973-06-19 Ibm Strip transmission line structures
US10488157B1 (en) * 1976-06-02 2019-11-26 Raytheon Company Dual mode seeker
US4916417A (en) * 1985-09-24 1990-04-10 Murata Mfg. Co., Ltd. Microstripline filter
US4809153A (en) * 1986-03-18 1989-02-28 Siemens Aktiengesellschaft Low-inductance bus bar arrangement
JPS63190404A (ja) * 1987-02-02 1988-08-08 Murata Mfg Co Ltd ストリツプライン
US4785271A (en) * 1987-11-24 1988-11-15 Motorola, Inc. Stripline filter with improved resonator structure
US5473296A (en) * 1993-03-05 1995-12-05 Murata Manufacturing Co., Ltd. Nonradiative dielectric waveguide and manufacturing method thereof
WO1998024141A1 (en) * 1996-11-26 1998-06-04 Raytheon Company Alignment tolerant overlay directional coupler
US5907266A (en) * 1996-11-26 1999-05-25 Raytheon Company Alignment tolerant overlay directional coupler
US6568067B2 (en) * 2000-02-10 2003-05-27 Murata Manufacturing Co., Ltd. Method of manufacturing the dielectric waveguide

Also Published As

Publication number Publication date
NL202113A (enrdf_load_stackoverflow)

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