US1988989A - Retardation device - Google Patents

Retardation device Download PDF

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Publication number
US1988989A
US1988989A US572370A US57237031A US1988989A US 1988989 A US1988989 A US 1988989A US 572370 A US572370 A US 572370A US 57237031 A US57237031 A US 57237031A US 1988989 A US1988989 A US 1988989A
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US
United States
Prior art keywords
retardation
sections
section
frequency
transients
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
US572370A
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English (en)
Inventor
Viard Georges
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.)
Lignes Telegraphiques et Telephoniques LTT SA
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Lignes Telegraphiques et Telephoniques LTT SA
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Application filed by Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
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Publication of US1988989A publication Critical patent/US1988989A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • H03H7/30—Time-delay networks
    • H03H7/32—Time-delay networks with lumped inductance and capacitance
    • 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
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors

Definitions

  • the present invention relates to retardation devices for use in electrical transmission systems. It is Well-.known that the operation of certain devices in transmission systems is sometimes con- 5 trolledA byk the .communication currents, and in thiscase, it is gnerally'neeessary .to retard the subsequent .transmission of these currents inl order to permit the previous operation of the devicesA controlled.
  • the retardation devices usually .employed comprise network sections composed of series connected inductance coils vand shunt condensers. lIn order to obtain an appreciable retardation, it is necessary, however, to use a large number of these sections, which becomes lvery expensive.
  • VThe present invention has for object to overcome the above disadvantage and provide a new type of retardation section which allows of obtaina vmuch greater retardation than with 'the sections hitherto employed.
  • .A .second lobject of the invention is to provide a retardation vsectionwhereby the retardation of the' current is, for a wide ⁇ band of frequencies, independent ojf the frequency of thesaidcurrent.
  • J.,- 2 represent diagrammatically sections 'of retardation networks constructed according to the invention.
  • Fig. 4 represents the type of retardation section customarily employed hitherto.
  • Figs. 5 and 6 represent retardation curves of the network sections described with reference to Fig. 4 and Fig. 1 respectively.
  • the quadripole section according to the invention is of the diagonal crossconnected type and is composed of series-connected inductances and two condensers connected shunt at the ends.
  • 'I'he inductance f is advantageously formed, in the style of aiPupin coil, by two windingswound round -a core.
  • the network section according to' Fig. ⁇ 1 is (o1. 17a-44) u illustrated in its .equivalent T form.
  • the condensers'placed in thedia'gonal bran'cliesjnay. be replaced whouy orin part by the uniformly distributed capacity ofthe two windings; such a section is diagrammatically represented in Fig. 3.
  • the end capacities g are not shown this Iiigure.
  • the articial linesh-itherto employed are composed of sections, one of which is illustrated in Figi. 4. 'The' pulsatance corresponding rto Vthe c'u't- It is known, on the other hand, that the dura tion t of the propagatiomi. e., the retardation time) per section, is gvenby:
  • This effect may be harmful for it is generally endeavoured, in transmission systems, to limit the duration of the transients as much as possible.
  • the retardation time t is given, from Equations (1) and (2'), by:
  • the retardation time varies but very slightly with the frequency for a wide frequency band, hence there is but a very slight increase of the duration of the transients.
  • the constant value of retardation is considerably increased in 'comparison with the curve 62:1, which corresponds to the value K :0, that is to say therefore, in comparison with the section of ordinary line illustrated in Fig. 4 and having the same cutoff frequency. .For @2:05,V the increase is about 30%.
  • I.claim:- 1 An electric retardation network section consisting essentially of a network of the diagonal GEoaEs VIARD.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
US572370A 1930-12-18 1931-10-31 Retardation device Expired - Lifetime US1988989A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR724213T 1930-12-18

Publications (1)

Publication Number Publication Date
US1988989A true US1988989A (en) 1935-01-22

Family

ID=9107780

Family Applications (1)

Application Number Title Priority Date Filing Date
US572370A Expired - Lifetime US1988989A (en) 1930-12-18 1931-10-31 Retardation device

Country Status (4)

Country Link
US (1) US1988989A (enrdf_load_stackoverflow)
BE (1) BE383777A (enrdf_load_stackoverflow)
FR (1) FR724213A (enrdf_load_stackoverflow)
GB (1) GB384035A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968808A (en) * 1954-08-24 1961-01-17 Alford Andrew Steerable antenna array

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973564C (de) * 1942-10-13 1960-03-31 Patelhold Patentverwertung Kuenstliche Hochfrequenzleitung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968808A (en) * 1954-08-24 1961-01-17 Alford Andrew Steerable antenna array

Also Published As

Publication number Publication date
GB384035A (en) 1932-12-01
BE383777A (enrdf_load_stackoverflow)
FR724213A (fr) 1932-04-23

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