US2474277A - Transmission line - Google Patents

Transmission line Download PDF

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Publication number
US2474277A
US2474277A US583406A US58340645A US2474277A US 2474277 A US2474277 A US 2474277A US 583406 A US583406 A US 583406A US 58340645 A US58340645 A US 58340645A US 2474277 A US2474277 A US 2474277A
Authority
US
United States
Prior art keywords
line
transmission line
wave
section
stub
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
US583406A
Other languages
English (en)
Inventor
Sidney B Pickles
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US583406A priority Critical patent/US2474277A/en
Priority to GB7316/46A priority patent/GB609190A/en
Priority to FR923851D priority patent/FR923851A/fr
Priority to ES182337A priority patent/ES182337A1/es
Application granted granted Critical
Publication of US2474277A publication Critical patent/US2474277A/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
    • H01P7/00—Resonators of the waveguide type
    • H01P7/02—Lecher resonators

Definitions

  • This invention relates to wave transmission systems and more especially to systems employing balanced transmission lines.
  • a principal object of the invention is to provide an improved blocking arrangement for preventing unbalanced currents in a normally balanced transmission line, from reacting undesirably on the terminal equipment connected to the line.
  • Another object is to provide a balanced transmission line coupling section having improved means for preventing unbalanced line currents from setting up undesirable resonance conditions in the line.
  • Another object is to provide a balanced transmission line with a quarter-wave blocking stub for unbalanced currents, together with means for localizing the effect of the unbalanced currents so that they are dissipated before reacting on the generator or load connected to the line and before they can set up any undesired resonance conditions in the line.
  • a feature of the invention relates to a novel building-out network employing quarter-wave line sections for blocking unbalanced line cur rents and for preventing the building-out network from reacting on the generator connected to the line.
  • Another feature relates to a shielded transmission line designed for balanced current transmission, having a quarter-wave line section connected thereto for blocking out unbalanced currents, and in conjunction with a pair of similar quarter-wave line sections disposed on opposite sides of the blocking section and forming dissipation networks for unbalanced currents on either side of said blocking section.
  • Another feature relates to a shielded transmission line having a short-circuited quarterwave line section bridged thereto, and in conjunction with a similar pair of quarter-wave line dissipating sections on either side of the blocking section, said dissipating sections constituting coaxial lines which are terminated in their respective characteristic impedances to prevent undesired resonance conditions which tend to arise from interaction between the blocking section and the generator as a result of said unbalanced currents.
  • a further feature relates to an improved balanced transmission line having one or more quarter-wave impedance matching stub lines.
  • Fig. 1 is a schematic diagram of a balanced transmission line with a quarter-wave blocking section connected thereto.
  • Fig. 2 is a schematic diagram of a transmission line embodying principles of the invention.
  • Fig. 3 is a modification of Fig.2.
  • a wave transmission line comprising a pair of conductors I and 2 which are supplied with wave energy from a suitable source, such as a high frequency generator 3, for supplying energy to a suitable load device or network 4.
  • a suitable source such as a high frequency generator 3
  • the transmission line is of any well-known balanced type and is connected to generator 3 so that in any given region the currents in the respective conductors I and 2 are of opposite phase with respect to ground or with respect to some other suitable base such as a shieldwhich encloses the line.
  • Fig. 2 wherein in addition to the usual short-circuited quarter-wave blocking line section 5 there are provided two additional quarter-wave line sections 6 and 7 preferably located at a distance of a quarter-wave length on each side of the section 5.
  • These supplementary sections 6 and 1 are in accordance with one phase of the invention terminated by impedances 8, 9, which are respectively equal to the surge impedances of the said line sections 6 and l acting as a two conductor line for parallel currents.
  • the terminating impedances 8 and 9 may be grounded as shown.
  • any unbalanced energy in that region of the main transmission line is reflected with a maximum voltage to each of the properly terminated building-out sections 6 and l.
  • the resistive impedances 8 and 5 of these latter sections therefore, dissipate this reflected energy before it has a chance to set up undesirable resonance conditions in other parts of the system.
  • the sections 5 and 7 are connected on each side of the blocking section 5 in the event that the unbalanced line conditions exist either on the generator side of the section 5 or on the load side of the section 5.
  • Fig. 3 there is shown an arrangement similar to that of Fig. 2, but embodied in a transmission line wherein the conductors i and 2 are enclosed Within a shielding conductor 10.
  • the parts corresponding to those of Fig. 2 bear the same designation numerals.
  • the two conductors of each of the stub sections 6 and l are connected through the respective terminating impedances 8 and 9 to the shield iii. Therefore, the con ductors of each stub section act as one conductor of a coaxial line, the other conductor of which is provided by the extension ii of the shield.
  • the impedances 8 and 9 which are connected to the two elements of the coaxial line stub sections absorb the parallel unbalanced currents which may be created by the presence of the blocking section 5.
  • a balanced wave transmission line having a building-out section connected thereto in the form of a quarter-wave short-circuited transmission line section, and at least one other quarter-wave transmission line section connected to said wave balanced transmission line adjacent the first-mentioned section and located an odd number of quarter-wave lengths from said building-out section, the shortcircuited end of said other section being connected to a dissipating impedance, the other end of which is connected to a point of neutral potential.
  • a balanced wave trans mission line having a building-out section con nected thereto in the form of a quarter-wave short-circuited stub line, and at least one other quarter-wave stub line connected to said transmission line adjacent the first-mentioned stub line, the short-circuited end of said other stub line being connected to a dissipative impedance the other end of which is connected to a point of neutral potential and being located approximately a quarter-wave length from the said first-mentioned stub line.
  • a balanced transmission line a short-circuited quarter-wave stub line connected to said balanced transmission line to act as a block against unbalanced currents on said line, and a pair of dissipating lines also connected to said transmission line on opposite sides of said stub line, said stub lines being spaced on opposite sides of said first-mentioned stub line approximately a quarter-Wave length therefrom, said dissipating lines comprising a shortcircuited quarter-wave length section, the shortcircuited end of which is connected to a dissipating impedance, the other end of which is connected to the ground.
  • a dual conductor transmission line a plurality of quarterwave stub line sections connected to said dual conductors at intervals of approximately onequarter wave length, a conductive shield for said line, said shield having extensions enclosing said stub lines, the intermediate stub line being unterminated with respect to its corresponding shield extension and the remaining stub lines being terminated to the respective extensions of the shield through respective dissipating impedances.
  • each of said stub lines is a sort-circuited quarter-wave transmission line section.
  • a balanced transmission line and means to counteract unbalanced currents on said line which tend to set up undesirable resonant conditions therein, said means comprising a set of three one-quarter Wave length short-circuited stub lines each connected to said balanced transmission line at spaced intervals of approximately a quarterwave length, the central one of said stub lines being unterminated, the short-circuited end of the adjacent stub lines being connected to an impedance having a value equal to the characteristic impedance of the stub line acting as a two-conductor line for parallel currents, the other end of said impedance being connected to a point of neutral potential.

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  • Dc Digital Transmission (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
US583406A 1945-03-19 1945-03-19 Transmission line Expired - Lifetime US2474277A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US583406A US2474277A (en) 1945-03-19 1945-03-19 Transmission line
GB7316/46A GB609190A (en) 1945-03-19 1946-03-08 Transmission line
FR923851D FR923851A (fr) 1945-03-19 1946-03-14 Lignes de transmission
ES182337A ES182337A1 (es) 1945-03-19 1948-02-13 Mejoras en lineas de transmisión

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US583406A US2474277A (en) 1945-03-19 1945-03-19 Transmission line

Publications (1)

Publication Number Publication Date
US2474277A true US2474277A (en) 1949-06-28

Family

ID=24332971

Family Applications (1)

Application Number Title Priority Date Filing Date
US583406A Expired - Lifetime US2474277A (en) 1945-03-19 1945-03-19 Transmission line

Country Status (4)

Country Link
US (1) US2474277A (fr)
ES (1) ES182337A1 (fr)
FR (1) FR923851A (fr)
GB (1) GB609190A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570579A (en) * 1946-12-06 1951-10-09 Rca Corp Transmission line system
FR2440627A1 (fr) * 1978-11-03 1980-05-30 Philips Nv Dispositif a guide d'ondes a ruban soutenu pour la propagation d'un mode d'onde impair
US7956704B1 (en) * 2007-02-28 2011-06-07 Pmc-Sierra Us, Inc. Loaded parallel stub common mode filter for differential lines carrying high rate digital signals

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248751A (en) * 1939-02-10 1941-07-08 Fed Telegraph Co Transmission modifying network
US2321521A (en) * 1941-01-10 1943-06-08 Farnsworth Television & Radio Frequency band filter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248751A (en) * 1939-02-10 1941-07-08 Fed Telegraph Co Transmission modifying network
US2321521A (en) * 1941-01-10 1943-06-08 Farnsworth Television & Radio Frequency band filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570579A (en) * 1946-12-06 1951-10-09 Rca Corp Transmission line system
FR2440627A1 (fr) * 1978-11-03 1980-05-30 Philips Nv Dispositif a guide d'ondes a ruban soutenu pour la propagation d'un mode d'onde impair
US7956704B1 (en) * 2007-02-28 2011-06-07 Pmc-Sierra Us, Inc. Loaded parallel stub common mode filter for differential lines carrying high rate digital signals

Also Published As

Publication number Publication date
GB609190A (en) 1948-09-27
ES182337A1 (es) 1948-04-01
FR923851A (fr) 1947-07-21

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