EP0967682A2 - Speisesystem für ein strahlendes Kabel - Google Patents

Speisesystem für ein strahlendes Kabel Download PDF

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Publication number
EP0967682A2
EP0967682A2 EP99304288A EP99304288A EP0967682A2 EP 0967682 A2 EP0967682 A2 EP 0967682A2 EP 99304288 A EP99304288 A EP 99304288A EP 99304288 A EP99304288 A EP 99304288A EP 0967682 A2 EP0967682 A2 EP 0967682A2
Authority
EP
European Patent Office
Prior art keywords
communication
leaky
leaky cable
cable
feeding system
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.)
Withdrawn
Application number
EP99304288A
Other languages
English (en)
French (fr)
Other versions
EP0967682A3 (de
Inventor
Masahisa c/o Optoelectronic Syst. Lab. Kaneta
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.)
National Institute for Land and Infrastructure Management
Original Assignee
Public Works Research Institute
Public Works Research Institute Ministry of Construction
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 Public Works Research Institute, Public Works Research Institute Ministry of Construction filed Critical Public Works Research Institute
Publication of EP0967682A2 publication Critical patent/EP0967682A2/de
Publication of EP0967682A3 publication Critical patent/EP0967682A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/203—Leaky coaxial lines

Definitions

  • the present invention relates to a feeding system for a leaky communication cable used for communications using high frequency signals, such as microwave signals.
  • Leaky cables are used for communications with moving bodies such as communications with a train, or communications with a vehicle running in a tunnel.
  • the direction of radio wave emission is determined by a gap between leaky holes located on the leaky cable 11.
  • the emitting direction is ⁇ and the gap between the leaky holes is P/2
  • the emitting direction ⁇ an angle close to the vertical direction is selected as the emitting direction ⁇ .
  • the angle of emitting direction ⁇ is actually vertical, propagation loss in the leaky cable becomes very large due to resonance, which disables communication. It is therefore required to emit a radio wave 20 in a diagonal direction slightly deviated from the vertical direction as shown in Fig. 7.
  • Objects of the present invention are to solve the problems of a feeding system for a leaky cable based on conventional technology, to provide a feeding system for a leaky cable not generating a communication disabled area in which radio waves do not reach and at the same time to provide a communication system having high reliability.
  • the present invention provides a feeding system for a leaky cable having communication units provided at both ends of the leaky cable for enabling feeding from either end of the leaky cable of a communication system for information transaction with moving bodies by using the leaky cable as an aerial cable.
  • Embodiment 1 of the present invention shown in Fig. 1 to Fig. 3, communication units 2-1 to 2-5 are located at both sides of leaky cables 1-1 to 1-4, and power is fed to both ends of each of the leaky cables 1-1 to 1-4 respectively.
  • four leaky cables and five communication units are provided in this example, there is no restriction to these numbers.
  • a communication disabled area 21 as shown in Fig. 2 occurs similarly to the case of the conventional type of bidirectional location system shown in Fig. 6.
  • the communication unit 2-3 is provided between the communication unit 2-2 and the communication unit 2-4 as shown in Fig. 3.
  • the communication disabled area 21 therefore falls in a communication range of the communication unit 2-3, so that generation of the communication disabled area 21 as described above is prevented.
  • a communication unit 2 fails, communications can be continuously performed by another communication unit 2 connected to the other end of the leaky cable 1 to which the failed communication unit 2 is connected, and because of this configuration, it never occurs that the communication state is completely disabled.
  • each pair of communication units 3-1, 3-2; 3-3, 3-4; 3-5, 3-6; 3-7, 3-8 is provided in both sides of each of leaky cables 1-1, 1-2, 1-3, 1-4 respectively, and power is fed to both ends of each of the leaky cables 1-1 to 1-4.
  • this Embodiment is different from Embodiment 1 only in that the communication units 3 feed power not to two leaky cables 1 at both sides but to one leaky cable 1, and is the same as Embodiment 1 in all other respects.
  • the number of cables 1 and a number of communication units 3 are not limited to those shown in the figure.
  • the present invention provides a communication system for transacting information with moving bodies by using a leaky cable 1 as an aerial cable, and in this communication system, communication units 2, 3 are provided at both ends of a leaky cable 1 for feeding power from both ends of the leaky cable 1, and because of this configuration, a communication disabled area 21 generated according to a direction in which a radio wave is emitted never occurs, and even if one of the communication units 2, 3 fails, another communication unit 2, 3 will generally work normally, which provides the advantage that probability of communication failure is reduced.

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  • Near-Field Transmission Systems (AREA)
EP99304288A 1998-06-10 1999-06-02 Speisesystem für ein strahlendes Kabel Withdrawn EP0967682A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16188098 1998-06-10
JP10161880A JPH11355184A (ja) 1998-06-10 1998-06-10 漏洩ケーブル給電方式

Publications (2)

Publication Number Publication Date
EP0967682A2 true EP0967682A2 (de) 1999-12-29
EP0967682A3 EP0967682A3 (de) 2000-08-16

Family

ID=15743752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99304288A Withdrawn EP0967682A3 (de) 1998-06-10 1999-06-02 Speisesystem für ein strahlendes Kabel

Country Status (2)

Country Link
EP (1) EP0967682A3 (de)
JP (1) JPH11355184A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001059874A1 (en) * 2000-02-12 2001-08-16 Motorola Inc. Distributed cellular telephone antenna system with adaptive cell configuration

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5838470B2 (ja) * 2011-10-14 2016-01-06 株式会社国際電気通信基礎技術研究所 無線通信装置および無線通信方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2500941A1 (de) * 1974-01-17 1975-07-24 Int Standard Electric Corp Linienleiteranordnung zur abstrahlung von radiowellen
EP0613259A1 (de) * 1993-02-22 1994-08-31 Alcatel SEL Aktiengesellschaft Einrichtung zum kontinuierlichen Informationsaustausch in einem Leckkabelübertragungssystem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2500941A1 (de) * 1974-01-17 1975-07-24 Int Standard Electric Corp Linienleiteranordnung zur abstrahlung von radiowellen
EP0613259A1 (de) * 1993-02-22 1994-08-31 Alcatel SEL Aktiengesellschaft Einrichtung zum kontinuierlichen Informationsaustausch in einem Leckkabelübertragungssystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LEINWEBER J: "NBS-TUNNELFUNK FUER KUNDENDIENSTE. ÖTECHNISCHE ALTERNATIVEN UND SYSTEMBESCHREIBUNG" SIGNAL + DRAHT,DE,TELZLAFF VERLAG GMBH. DARMSTADT, vol. 82, no. 6, 1 June 1990 (1990-06-01), pages 117-123, XP000248955 ISSN: 0037-4997 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001059874A1 (en) * 2000-02-12 2001-08-16 Motorola Inc. Distributed cellular telephone antenna system with adaptive cell configuration
US6459909B1 (en) 2000-02-12 2002-10-01 Motorola, Inc. Distributed cellular telephone antenna system with adaptive cell configuration

Also Published As

Publication number Publication date
JPH11355184A (ja) 1999-12-24
EP0967682A3 (de) 2000-08-16

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