EP2157667B1 - Verfahren zur Stromversorgung über ein Koaxialkabel und entsprechender Verbinder - Google Patents

Verfahren zur Stromversorgung über ein Koaxialkabel und entsprechender Verbinder Download PDF

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Publication number
EP2157667B1
EP2157667B1 EP08305462.7A EP08305462A EP2157667B1 EP 2157667 B1 EP2157667 B1 EP 2157667B1 EP 08305462 A EP08305462 A EP 08305462A EP 2157667 B1 EP2157667 B1 EP 2157667B1
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EP
European Patent Office
Prior art keywords
connector
coaxial cable
cable
contact
inner conductor
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EP08305462.7A
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English (en)
French (fr)
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EP2157667A1 (de
Inventor
Erhard Mahlandt
Werner Wild
Gerhard Wunder
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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Priority to EP08305462.7A priority Critical patent/EP2157667B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0503—Connection between two cable ends
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections

Definitions

  • the present invention relates to a method for supplying power supply over a coaxial cable.
  • Methods for supplying power over a coaxial cable are usually used for supplying power up through a coaxial cable to power an antenna mounted preamplifier, the DC power source being located at the bottom of the antenna mast.
  • the coaxial cable is used for transmitting the signal to be sent through the antenna.
  • a specific Bias T arrangement is necessary for feeding simultaneously DC power and RF signal through the coaxial cable.
  • a bias T is shown on figure 1 .
  • the bias T shows 2 inputs +DC, RF signal and one output ANT.
  • Input +DC is connected to one wire of the power supply cable, preferably the non ground wire.
  • Input RF signal is a coaxial cable end connector adapted to be connected to a RF signal.
  • Output ANT is also a coaxial cable end connector to which the coaxial cable leading to the antenna can be connected.
  • the function of the Bias T consist in avoiding the DC power supplied to input +DC from looping back to input RF signal and reciprocally to avoid the RF signal from looping back to the DC power input.
  • 2 inductors are connected between input +DC and output ANT which block the 900 1200 MHz RF signal while passing the DC power.
  • a capacitor is connected between the RF signal input and the antenna output to block the DC power while passing the RF signal.
  • the second DC power wire, as well as the outer conductors of all coaxial cable end connectors are put to the ground on the Bias T housing.
  • One single coaxial cable combines the functionality of power supply and RF supply.
  • the remote radio heads Since recently remote radio heads where developed where the whole or at least part of the base station hardware needs to be installed close to the antenna making the transport of RF signal through a coaxial cable obsolete.
  • the remote radio heads have to be connected to power supply and to an optical fibre for the digital data transmission which have to run up to the tower.
  • the DC power to be supplied in this configuration has a voltage is in the range of 48 V and a current is in the range of 25 A.
  • the required cable for the power supply may have wires with a cross section of 16 mm 2 .
  • the Bias T arrangements presented above have nevertheless the disadvantage not to be able to handle DC current of 25A and more. They are also not designed to connect a 2 wire shielded cable with wire cross sections of 16mm 2 and more.
  • Patents US 5 928032 , US 6039 609 and patent applications US 2006/292925 disclose known connector arrangements adapted to connect a two wire cable to a coaxial cable.
  • Patent applications DE 196 53 998 disclose a connector arrangement to be adapted on a coaxial cable.
  • Another object of the invention is to provide a corresponding connector for connecting a power supply cable to coaxial cable.
  • a connector for connecting a 2 wire power supply cable to a coaxial cable according to claim 1 and a method for supplying power over a coaxial cable according to claim 10.
  • the method consists in connecting the one wire of the power cable to the inner conductor of the coaxial cable and connecting the second wire of the power cable to the outer conductor of the coaxial cable.
  • This invention presents the advantage that when existing base stations sites of traditional system approach shall be replaced by a remote radio head system, the already installed coaxial cables can be reused for the power supply. Consequently, coaxial cables are reused even if no RF signal is transported any more through the coaxial cable for supplying power to antennas and their associated remote radio heads. Additionally, the coaxial cable can be reused as protection tube of the optical fibre in case the coaxial cable has a hollow inner conductor.
  • This invention further presents the advantage that a quite solid connection can be established between both wires of the power cable and both conductors of the coaxial cable so that moisture and dust sealing can be reached easily. This is especially required for DC power with a voltage about 48 V and a current about 25A.
  • the connector presents good contact in term of contact area and contact pressure to the coaxial cable.
  • Figure 2 shows an arrangement comprising a power supply cable a connector and a coaxial cable according to the present invention.
  • the three elements are represented: the power supply cable 21, the coaxial cable 22 and connector 23.
  • Power supply cable 21 comprises 2 wires, 211, 212 and optionally braided shield not shown on the figure.
  • the power supply cable transport power with a voltage of about 48 V and a current of about 25 A.
  • the contact surface of the wire is preferably about 16 mm 2 .
  • Coaxial cable 22 comprises an inner conductor 221, an outer conductor 222, a dielectric 223.
  • Connector 23 will be further detailed thanks to figures 3 and 4a , 4b, 4c .
  • figure 2 should be preferably referred to.
  • Connector 23 comprises a connector front part 231, a connector middle part 232 and a connector back part 233.
  • Connector front part 231 is the interface with the power supply cable 21 while connector back part 233 is the interface with the coaxial cable 22.
  • Connector front part 231 are externally preferably cylindrical or conic with an axial hole for power supply cable 21 to be lead thought the hole.
  • Connector front part 231 further comprises fixation means to connector middle part 232.
  • the diameters of both parts are adjusted to each other so that connector middle part 232 can be inserted into connector front part creating a fixed and sealed liaison.
  • Connector middle part 232 comprises contacting means preferably in the form of 2 soldered or crimped or clamped contact bushes 2322 each adapted to receive one of the wires 211, 212.
  • Connector middle part 232 comprises contacting means preferably in form of a conic inner surface 2321 cooperating with a conic clamping ring 2331 of the connector back part 233. These contacting means are enabling a clamped contact of outer conductor 222 to the middle connector part 232.
  • the connector middle part 232 is arranged to establish a solid contact C1 been one contact bush 2322 and the outer conductor 222 on the one hand and a solid contact C2 between the second contact bush 2322 and the inner conductor221 on the other hand.
  • Contact bushes 2322 for the wires of the power supply cables could be separated parts which could be pressed into appropriate holes in the connector middle part 232.
  • the contact bush that contacts the outer conductor of the coaxial cable and connector middle part may be manufactured as one single piece. (Both bushes have to be electrically isolated).
  • the contact bushes 2322 can be made either such that the power supply cable wires are soldered, crimped or fixed with a screw inside them.
  • Both contact bushes 2322 are electrically isolated from each other preferably by an isolating material as but not restricted to a plastic ring 2323
  • Connector middle part 232 is adapted to be fixed thanks to fixations means 2324 as for example spring fingers or screwed contact to coaxial cable 22.
  • the fixation is performed in the center of the coaxial cable 22 in the area of the inner conductor 221.
  • the contact to the inner conductor 221 of the coaxial cable 22 is made with a self-tapping screw type inner conductor 221. The self-tapping contact would allow using the same connector for coaxial cables made from different suppliers having certain variations of dimensions and wall thicknesses.
  • the connector back part 233 may comprises in addition to the clamping ring 2331, o-rings 2332 for establishing a sealed contact with the outer part of the coaxial cable 22.
  • Coaxial cable outer conductor 222 is pressed against conic surface 2321 when the connector back part 233 is tightened on coaxial cable 22.
  • FIG. 5 it is foreseen to have a optical fiber cable 24 being fed through connector 23. It would be especially advantageous to have the optical fiber cable being inserted in an axial opening of the inner conductor 221 of coaxial cable 22.
  • Coaxial cable 22 would constitute a further protection for the optical fiber cable 24 and would limit the size used for having the optical fiber cable being connected to a remote radio head. The digital signal being forwarded towards the remote radio head through this optical fiber cable.
  • the connector middle part 232 would show an hollow finger resp screw 2324 for letting the coaxial cable go through the connector middle part.
  • bush 2322 connected to the inner conductor 221 would no more be in the axis of the coaxial cable but ex-centred and electrically connected to finger resp. screw 2324.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)

Claims (9)

  1. Konnektor (23), ausgelegt für seine Verwendung zum Verbinden eines Zweileiter-Spannungsversorgungskabels (21) an ein Koaxialkabel (22) mit einem inneren (221) und einem äußeren (222) Leiter, wobei besagter Konnektor umfasst:
    - ein Konnektormittelteil (232), welches zwei Kontaktbuchsen (2322) umfasst, von denen jede ausgelegt ist für die Aufnahme eines der Leiter (211, 212) besagten Spannungsversorgungskabels (21), wobei besagter Konnektormittelteil (232) weiterhin Mittel (2321) für das elektrische Verbinden einer der besagten Kontaktbuchsen (2322) mit besagtem äußerem Leiter (222) besagten Koaxialkabels (22) und Mittel (2324) für das elektrische Verbinden der anderen Kontaktbuchsen (2322) mit dem inneren Leiter (221) besagten Koaxialkabels (22);
    - Befestigungsmittel (233, 2324) für das Befestigen besagten Konnektormittelteils auf besagtem Koaxialkabel (22) und Befestigungsmittel (231) für das Befestigen besagten Konnektormittelteils auf besagtem Spannungsversorgungskabel (21).
    - wobei besagte elektrische Verbindung zwischen besagter anderer Kontaktbuchse (2322) und besagtem inneren Leiter (221) besagten Koaxialkabels (22) erreicht wird durch das Einführen eines Metallfingers (2324) in eine Öffnung des inneren Leiters (221), welche die Größe des besagten Metallfingers hat, wobei besagter Metallfinger mit besagter anderer Kontaktbuchse (2322) verbunden wird, wobei besagter Metallfinger Befestigungsmittel (2324) zur Befestigung in besagtem innerem Leiter umfasst, wobei besagte Befestigungsmittel (2324) Federfinger oder Schraubkontakte sind.
  2. Konnektor nach Anspruch 1, wobei besagte elektrische Verbindung zwischen besagter Kontaktbuchse (2322) und besagtem äußerem Leiter (222) besagten Koaxialkabels (22) erreicht wird durch das Zusammenwirken einer konischen Oberfläche (2321) besagten Konnektormittelteils, das elektrisch mit besagter Kontaktbuchse (2322) verbunden ist, und einem Klemmring (2331), wobei das äußere Leiterende sich verdickt und zwischen besagtem Klemmring (2331) und besagter konischer Oberfläche (2321) eingeklemmt wird.
  3. Konnektor nach Anspruch 1, wobei besagte Befestigungsmittel zum Befestigen besagten Konnektormittelteils (232) auf besagtem Spannungsversorgungskabel (21) aus einem Konnektorvorderteil (231) mit einer Öffnung bestehen, die dazu dient, besagtes Spannungsversorgungskabel in besagtes Konnektorvorderteil (231) einzuführen, wobei besagtes Konnektorvorderteil am Konnektormittelteil (232) befestigt ist.
  4. Konnektor nach Anspruch 1, wobei besagte Befestigungsmittel zum Befestigen besagten Konnektormittelteils (232) auf besagtem Koaxialkabel (22) aus einem Konnektorhinterteil (233) mit einer Öffnung bestehen, die dazu dient, besagtes Koaxialkabel (22) in besagtes Konnektorhinterteil einführen zu können, wobei besagtes Konnektorhinterteil dafür ausgelegt ist, um besagten Klemmring (2331) auf besagten äußeren Leiter (222) zu pressen.
  5. Konnektor nach Anspruch 1, wobei besagte elektrische Verbindung zwischen besagter Kontaktbuchse (2322) und besagtem innerem Leiter (221) besagten Koaxialkabels (22) erreicht wird durch das Einschrauben eines Schraubteils (2324) besagten Konnektormittelteils in eine Öffnung des inneren Leiters (221).
  6. Konnektor nach Anspruch 1, weiterhin Mittel (2323) für das elektrische Isolieren der besagten zwei Kontaktbuchsen (2322) voneinander umfassend.
  7. Konnektor nach Anspruch 1, weiterhin eine zusätzliche Öffnung in besagtem Konnektormittelteil (232) umfassend, das dem Einführen eines Glasfaserkabels durch besagten Konnektormittelteil dient.
  8. Konnektor nach Anspruch 7, wobei besagter Konnektormittelteil einen hohlen Metallfinger (2324) umfasst, der dem Einführen eines Glasfaserkabels durch besagten Konnektormittelteil dient.
  9. Verfahren zur Spannungsversorgung über ein Koaxialkabel (22), wobei besagte Spannung von einem Zweileiter-Spannungsversorgungskabel (21) transportiert wird, wobei besagtes Verfahren die folgenden Schritte umfasst:
    - das Befestigen eines jeden der beiden Leiter (211, 212) besagten Spannungsversorgungskabels (21) in einer Kontaktbuchse (2322) eines Konnektors (23);
    - das Befestigen an und elektrische Verbinden einer der besagten Kontaktbuchsen (2322) mit dem besagten, inneren Leiter (221) besagten Koaxialkabels (22) durch das Einführen eines Metallfingers (2324) in eine Öffnung des inneren Leiters (221), welche die Größe des besagten Metallfingers hat, wobei besagter Metallfinger mit besagter Kontaktbuchse (2322) verbunden wird, wobei besagter Metallfinger Befestigungsmittel (2324) zur Befestigung auf dem besagten inneren Leiter umfasst, wobei besagte Befestigungsmittel (2324) Federfinger oder Schraubkontakte sind.
    - das Befestigen an und elektrische Verbinden der anderen Buchse (2322) mit besagtem äußerem Leiter (222) des Koaxialkabels (22).
EP08305462.7A 2008-08-12 2008-08-12 Verfahren zur Stromversorgung über ein Koaxialkabel und entsprechender Verbinder Active EP2157667B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08305462.7A EP2157667B1 (de) 2008-08-12 2008-08-12 Verfahren zur Stromversorgung über ein Koaxialkabel und entsprechender Verbinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08305462.7A EP2157667B1 (de) 2008-08-12 2008-08-12 Verfahren zur Stromversorgung über ein Koaxialkabel und entsprechender Verbinder

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EP2157667A1 EP2157667A1 (de) 2010-02-24
EP2157667B1 true EP2157667B1 (de) 2017-08-30

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3297093B1 (de) * 2016-09-16 2019-01-02 Rosenberger Hochfrequenztechnik GmbH & Co. KG Steckverbinder zum verbinden einer optischen faser und eines elektrischen leiters

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Publication number Priority date Publication date Assignee Title
US6039609A (en) * 1996-07-17 2000-03-21 Thomas & Betts International, Inc. Power inserter connector
DE19653998A1 (de) * 1996-12-21 1998-06-25 Alsthom Cge Alcatel Verfahren zum feuchtigkeitsdichten Anbringen eines Verbindungselements an einem Hochfrequenzkabel
US5928032A (en) * 1997-01-31 1999-07-27 Lucent Technologies, Inc. Coaxial cable power adapter
US7160149B1 (en) * 2005-06-24 2007-01-09 John Mezzalingua Associates, Inc. Coaxial connector and method of connecting a two-wire cable to a coaxial connector

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