EP0892456A1 - Kontaktlose Kopplung durch ein Dielektrikum - Google Patents

Kontaktlose Kopplung durch ein Dielektrikum Download PDF

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Publication number
EP0892456A1
EP0892456A1 EP98305745A EP98305745A EP0892456A1 EP 0892456 A1 EP0892456 A1 EP 0892456A1 EP 98305745 A EP98305745 A EP 98305745A EP 98305745 A EP98305745 A EP 98305745A EP 0892456 A1 EP0892456 A1 EP 0892456A1
Authority
EP
European Patent Office
Prior art keywords
dielectric
spirals
conductive
contact connection
coupling
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Withdrawn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
EP98305745A
Other languages
English (en)
French (fr)
Inventor
Michael Philippakis
David Moore
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.)
ERA Patents Ltd
Original Assignee
ERA Patents Ltd
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 ERA Patents Ltd filed Critical ERA Patents Ltd
Publication of EP0892456A1 publication Critical patent/EP0892456A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H01Q1/1285—Supports; Mounting means for mounting on windscreens with capacitive feeding through the windscreen

Definitions

  • the present invention relates to a system for transmitting radio frequency energy through a dielectric, for example through a plastics wall of an equipment containing box, and to an antenna assembly including the system for transmitting radio frequency energy through the dielectric.
  • RF electrical equipment is often contained in a hermetically sealed equipment box.
  • a dedicated connector which passes through the dielectric wall of the equipment box. This is undesirable, firstly as the dedicated connector can be expensive to provide, therefore giving an unacceptable additional cost to the equipment, and secondly as the connector constitutes a weak point in the hermetic seal around the equipment.
  • US-A-4,238,799 discloses a non-contact connection using capacitive coupling to allow transmission of signals to and from an in-car mobile telephone antenna.
  • the capacitive coupler is combined with an inductive susceptance to create a well matched system and thereby ensures a low level of reflected energy.
  • the coupling of the connection is optimised by selection of an appropriate inductor.
  • US-A-5,105,201 discloses a glass mounted antenna for a car radio having a conductive spiral coil connected to the antenna for coupling with a second conductive spiral coil on the inside of the glass which is connected to a receiver.
  • a non-contact connection through a dielectric comprising a pair of counter-wound conductive spirals provided on opposite sides of the dielectric, is characterised in that a pair of ground planes sandwich the conductive spirals and the dielectric.
  • the counter-wound conductive spirals are inductively coupled to each other to allow transmission of signals through the dielectric.
  • the ground planes create a capacitative coupling effect and constrain the fields in the device, resulting in a low profile device with reduced stray radiation and therefore high efficiency.
  • the ground planes also allow greater control over the environment in which the device operates, allowing greater control of the impedances within the device so that the bandwidth may be optimised.
  • a capacitor is provided at the input of each of the spirals. This gives a low reflection coefficient which ensures low transmission losses.
  • the connection can be matched by adjusting the capacitance of the capacitor. It is possible to provide a variable capacitance to allow the coupling to be optimised for any given dielectric substrate through which the signals are to be transmitted, and depending on the frequency of the signals to be transmitted. However, due to the large bandwidth for which the system is preferably designed, the system is relatively insensitive to the dielectric properties of the dielectric, and accordingly a standard capacitance is acceptable.
  • the two counter-wound conductive spirals have the same configuration.
  • the conductive spirals advantageously have either a rectangular, square or circular configuration.
  • the counter-wound conductive spirals may be formed from wire, however it is preferred that the spirals are formed onto a substrate, for example by a conventional deposition or etching method. Preferably the groound planes are formed on the rear of the substrate. Where a capacitor is provided to optimise the connection, the capacitor is advantageously printed or otherwise formed on the substrate with the conductive spiral. This is beneficial as it allows the conductive spiral and capacitive element to be encapsulated to help prevent ingress of water or other fluid which may damage the device, and results in a more compact structure.
  • the two counter-wound conductive spirals are rotatably provided with respect to each other. This allows the coupling to be formed as a rotatable coupling through which signals can be transmitted.
  • the radio frequency energy to be transmitted by the coupling according to the present invention preferable has a frequency of at least 50MHz, and preferably has a maximum frequency of 2,000MHz.
  • an antenna assembly comprises a non-contact connection according to the first aspect of the present invention, and an antenna connected to one of the conductive spirals of the non-contact junction.
  • the antenna assembly includes a matching network to match the antenna and the non-contact coupling.
  • the coupling includes two counter-wound spirals (1,2) formed of a conductive material. These spirals (1,2) are printed onto respective dielectric substrates (3,4) on the opposite sides of which are conductive ground planes (8,9).
  • the spirals (1,2) may alternatively be formed on the dielectric substrates (3,4) by etching, or may be formed separately and provided on the dielectric substrates (3,4) subsequently.
  • a capacitor (10) is connected in series with each of the conductive spirals (1,2).
  • the capacitors are printed on the dielectric substrates (3,4) together with the conductive spirals (1,2), and are formed, for example by trimming, to optimise the transmission characteristics of the coupling for the particular dielectric through which the coupling is to be made and for the particular frequency range of the signals to be transmitted through the dielectric.
  • Each spiral (1,2), dielectric substrate (3,4) and ground plane (8,9) is provided against the opposite faces of a dielectric layer (5), forming a multi-layer sandwich with the dielectric layer (5) in the centre and the ground planes (8,9) on the outer edges.
  • an RF signal to be transmitted through the dielectric layer (5) is supplied through a capacitor to one of the conductive spirals (1,2). Due to the inductive coupling through the dielectric layer (5), RF signals are induced in the other conductive spiral (1,2) from where the signals are output through the second capacitor.
  • the dielectric substrate (5) may be the plastics wall of an equipment box.
  • electrical equipment is provided within the box, and is connected to one of the conductive spirals (1,2) which is provided on the inner wall of the box.
  • the other conductive spiral (1,2) is provided on the outer surface of the box, and forms the non-contact inductive coupling between the inside and outside of the box through which signals are transmitted to and from the equipment within the box.
  • FIG. 2 A specific example of a coupling according to the present invention is shown in Figure 2. This is designed to work at a frequency of 184MHz through a lmm dielectric wall of polycarbonate.
  • the dielectric substrates (3,4) on which the conductive spirals (1,2) are formed are also polycarbonate substrates having a thickness of 2.4mm, and being approximately 40mm square.
  • the ground plane (8,9) is formed on the rear of the dielectric substrate (3,4), and a 10pf capacitor (10) is provided on the same side of the substrate (3,4) as the ground plane (8,9). Both the conductive spirals (1,2) and both the ground planes (8,9) are formed from copper.
  • the capacitor (10) is connected to the outer end of the spiral (1,2) and the inner end of the spiral (1,2) is connected to the ground plane (8,9) via plated through holes (11) extending through the substrate (3,4). This allows the surface on which the spiral (1,2) is formed to remain flat.
  • the coupling may be used in conjunction with an antenna (6,7).
  • the antenna (6,7) is connected directly to one of the conductive spirals (1,2).
  • An RF signal is applied to the other conductive spiral (1,2) via an input (12) from within a housing (13), and this is coupled through the non-contact inductive coupling to the other conductive spiral (1,2) and to the antenna (6,7) to transmit the signal.
  • This system can also be used for reception of the signals by the antenna (6,7).
  • Figure 3 shows a loop antenna (6) used in conjunction with the non-contact coupling
  • Figure 4 shows a monopole antenna (7) having a helical design, although other antennas may be used.
  • the non-contact coupling can be formed as a rotatable coupling.
  • the dielectric is an air gap.
  • one of the ground plates (3) and the associated conductive spiral (1) are rotatably mounted with respect to the other ground plate (4) and spiral (2). Due to the spiral design of the conductive coupling, the relative angular position of the substrates (3,4) and conductors (1,2) will not affect the coupling.
EP98305745A 1997-07-17 1998-07-17 Kontaktlose Kopplung durch ein Dielektrikum Withdrawn EP0892456A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9715110A GB9715110D0 (en) 1997-07-17 1997-07-17 Coupling
GB9715110 1997-07-17

Publications (1)

Publication Number Publication Date
EP0892456A1 true EP0892456A1 (de) 1999-01-20

Family

ID=10816026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98305745A Withdrawn EP0892456A1 (de) 1997-07-17 1998-07-17 Kontaktlose Kopplung durch ein Dielektrikum

Country Status (2)

Country Link
EP (1) EP0892456A1 (de)
GB (2) GB9715110D0 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000079644A1 (en) * 1999-06-17 2000-12-28 Moteco Ab Antenna device
WO2000079641A2 (en) * 1999-06-17 2000-12-28 Moteco Ab Antenna device
US7193572B2 (en) 2002-05-16 2007-03-20 Kathrein-Werke Kg Roof antenna for motor vehicles
CN101322144B (zh) * 2005-10-25 2012-12-05 关卡系统股份有限公司 带状部件、标签或镶嵌物、及制造标签或镶嵌物的方法
US20150349612A1 (en) * 2013-02-12 2015-12-03 Murata Manufacturing Co., Ltd. Rotating electrical machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621243A (en) * 1984-12-30 1986-11-04 Harada Kogyo Kabushiki Kaisha Transmission channel coupler for antenna
FR2643749A1 (fr) * 1989-02-23 1990-08-31 Dx Antenna Dispositif de couplage d'une ligne coaxiale a haute frequence
US5105201A (en) * 1989-06-30 1992-04-14 Harada Kogyo Kabushiki Kaisha Glass mounted antenna for car radio
EP0645838A2 (de) * 1993-09-24 1995-03-29 Nippon Steel Corporation Kontaktloser Drehkoppler

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69434567T2 (de) * 1994-10-12 2006-07-27 Dai Nippon Printing Co., Ltd. Signalübertragungseinrichtung unter Verwendung eines festen und eines drehbaren Körpers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621243A (en) * 1984-12-30 1986-11-04 Harada Kogyo Kabushiki Kaisha Transmission channel coupler for antenna
FR2643749A1 (fr) * 1989-02-23 1990-08-31 Dx Antenna Dispositif de couplage d'une ligne coaxiale a haute frequence
US5105201A (en) * 1989-06-30 1992-04-14 Harada Kogyo Kabushiki Kaisha Glass mounted antenna for car radio
EP0645838A2 (de) * 1993-09-24 1995-03-29 Nippon Steel Corporation Kontaktloser Drehkoppler

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000079644A1 (en) * 1999-06-17 2000-12-28 Moteco Ab Antenna device
WO2000079641A2 (en) * 1999-06-17 2000-12-28 Moteco Ab Antenna device
WO2000079641A3 (en) * 1999-06-17 2007-11-01 Moteco Ab Antenna device
US7193572B2 (en) 2002-05-16 2007-03-20 Kathrein-Werke Kg Roof antenna for motor vehicles
CN101322144B (zh) * 2005-10-25 2012-12-05 关卡系统股份有限公司 带状部件、标签或镶嵌物、及制造标签或镶嵌物的方法
US20150349612A1 (en) * 2013-02-12 2015-12-03 Murata Manufacturing Co., Ltd. Rotating electrical machine

Also Published As

Publication number Publication date
GB2328123A (en) 1999-02-10
GB9815663D0 (en) 1998-09-16
GB9715110D0 (en) 1997-09-24

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