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WO1992010865A1 - Isolated antenna bases - Google Patents

Isolated antenna bases Download PDF

Info

Publication number
WO1992010865A1
WO1992010865A1 PCT/GB1991/001875 GB9101875W WO9210865A1 WO 1992010865 A1 WO1992010865 A1 WO 1992010865A1 GB 9101875 W GB9101875 W GB 9101875W WO 9210865 A1 WO9210865 A1 WO 9210865A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
vehicle
base
metal
integral
Prior art date
Application number
PCT/GB1991/001875
Other languages
French (fr)
Inventor
Leslie James Wallen
Original Assignee
Les Wallen Manufacturing Limited
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
Priority claimed from GB9026466A external-priority patent/GB2250637A/en
Application filed by Les Wallen Manufacturing Limited filed Critical Les Wallen Manufacturing Limited
Publication of WO1992010865A1 publication Critical patent/WO1992010865A1/en

Links

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
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H01Q1/1285—Supports; Mounting means for mounting on windscreens with capacitive feeding through the windscreen
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles

Definitions

  • This invention is a range of antenna bases, integral to the antenna, using the same technical principle.
  • the vehicle When a mobile communication antenna is fitted to a vehicle, the vehicle normally becomes a part of the antenna circuit and this part of the antenna circuit is called the groundplane.
  • the antenna base is fitted by drilling a hole and the car is connected to the antenna circuit by way of the mechanical structure of the antenna base itself.
  • this has presented a number of problems, two of the most significant of these are: first, that it may not be practical to drill a hole in the car - second, that if the vehicle has an insulated return electrical system and is used in the petro-chemical industry to carry volatile liquids or explosives, or it has a highly sophisticated, computerised electrical system, the connecting of the antenna earth could make it dangerous, becoming a serious fire risk or causing a malfunction in the computer with serious probable consequences.
  • the present invention overcomes both of these problems, because it does not require a hole to be drilled and it does not connect the antenna earth to the vehicle directly, but capacitively.
  • Figure 1 the antenna base is shown in cross-section attached to the vehicle panel or bodywork, irrespective of the location.
  • the coaxial cable 8 which connects the transmitter/ receiver to the antenna is terminated within the antenna base body moulding section 4.
  • the antenna earth or return which is the screened part of the cable is
  • the centre 3 or hot part of the antenna cable 2 is connected to 1 where any suitable antenna can be affixed.
  • the connecting of the antenna earth or braid side of the coaxial cable to plate 5 could be magnetic, providing dielectric 6 is a suitable material and the vehicle surface 9 is of a ferrous material, thus allowing a magnetic flux with 5.
  • Plate 6 could be of any alternative suitable material offering itself as a capacitor plate, providing dielectric 6 is also adhesive on both sides.
  • the radio signal When the radio signal is induced into the antenna base, it is connected to the antenna affixed to 1 and to the vehicle capacitively through plate 5 and dielectric 6, due to the alternating current of the radio signal, but at no time will the vehicle be directly connected to the antenna earth.
  • the cable 8 will also be of sufficiently small diameter to practically run through extremities of the vehicle without causing problems, i.e. doors, boot lid, hatch back, door etc.

Landscapes

  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)

Abstract

An antenna base, integral to the antenna, which is capacitively coupled to the bodywork or panel of a metal vehicle, or any other form of metal or substitute material groundplane, by any appropriate method comprising of a dielectric or material of suitable permeativity. The antenna is thereby connected to ground enabling alternating current to pass in the form of radio frequency, but not allowing direct current to pass and thus isolating it. The capacitive coupling and d.c. isolation is achieved by the antenna base itself so that no other structure is required between the base and the vehicle to which it is attached.

Description

Description
Isolated antenna bases
This invention is a range of antenna bases, integral to the antenna, using the same technical principle.
When a mobile communication antenna is fitted to a vehicle, the vehicle normally becomes a part of the antenna circuit and this part of the antenna circuit is called the groundplane.
Usually the antenna base is fitted by drilling a hole and the car is connected to the antenna circuit by way of the mechanical structure of the antenna base itself. For many years, this has presented a number of problems, two of the most significant of these are: first, that it may not be practical to drill a hole in the car - second, that if the vehicle has an insulated return electrical system and is used in the petro-chemical industry to carry volatile liquids or explosives, or it has a highly sophisticated, computerised electrical system, the connecting of the antenna earth could make it dangerous, becoming a serious fire risk or causing a malfunction in the computer with serious probable consequences.
The present invention overcomes both of these problems, because it does not require a hole to be drilled and it does not connect the antenna earth to the vehicle directly, but capacitively. A specific embodiment of the invention will now be described by way of example with reference to the
accompanying drawing in which:-
Figure 1 the antenna base is shown in cross-section attached to the vehicle panel or bodywork, irrespective of the location.
The coaxial cable 8 which connects the transmitter/ receiver to the antenna is terminated within the antenna base body moulding section 4. The antenna earth or return which is the screened part of the cable is
terminated at 7, directly in contact with the capacitive plate 5. The centre 3 or hot part of the antenna cable 2 is connected to 1 where any suitable antenna can be affixed. The connecting of the antenna earth or braid side of the coaxial cable to plate 5 could be magnetic, providing dielectric 6 is a suitable material and the vehicle surface 9 is of a ferrous material, thus allowing a magnetic flux with 5. Plate 6 could be of any alternative suitable material offering itself as a capacitor plate, providing dielectric 6 is also adhesive on both sides.
When the radio signal is induced into the antenna base, it is connected to the antenna affixed to 1 and to the vehicle capacitively through plate 5 and dielectric 6, due to the alternating current of the radio signal, but at no time will the vehicle be directly connected to the antenna earth.
The cable 8 will also be of sufficiently small diameter to practically run through extremities of the vehicle without causing problems, i.e. doors, boot lid, hatch back, door etc.

Claims

Claim
An antenna base, integral to the antenna, which is capacitively coupled to the bodywork or panel of a metal vehicle, or any other form of metal or other substitute material groundplane, which is fastened, attached or secured via any suitable method, comprising of dielectric or material of suitable permeativity, which thus isolates it from direct current (DC), but which allows an alternating current ( AC ) to pass.
The antenna base, integral to the antenna, achieves the capacitive coupling soley through the antenna's mechanical design and is not dependent upon structures additional to the vehicle to which it is attached.
PCT/GB1991/001875 1990-12-05 1991-10-25 Isolated antenna bases WO1992010865A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9026466.4 1990-12-05
GB9026466A GB2250637A (en) 1990-12-05 1990-12-05 Isolated antenna bases
GB9113933A GB2250639A (en) 1990-12-05 1991-06-26 Isolated antenna bases
GB9113933.7 1991-06-26

Publications (1)

Publication Number Publication Date
WO1992010865A1 true WO1992010865A1 (en) 1992-06-25

Family

ID=26298063

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001875 WO1992010865A1 (en) 1990-12-05 1991-10-25 Isolated antenna bases

Country Status (4)

Country Link
EP (1) EP0515590A1 (en)
AU (1) AU8749791A (en)
DE (1) DE9116508U1 (en)
WO (1) WO1992010865A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0605766A1 (en) * 1992-12-31 1994-07-13 Richard Hirschmann GmbH & Co. Vehicle antenna for high frequencies
EP0710998A3 (en) * 1994-11-04 1996-09-18 Daimler Benz Ag Vehicle antenna
EP0817306A2 (en) * 1996-06-19 1998-01-07 Ford Motor Company Limited Improved vehicular radio antennas
EP1064692A1 (en) * 1998-03-19 2001-01-03 Smarteq AB Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies
GB2489802A (en) * 2011-04-07 2012-10-10 Imagination Tech Ltd A vehicle DAB antenna with through window signal coupling and a capacitive ground coupler

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080603A (en) * 1976-07-12 1978-03-21 Howard Belmont Moody Transmitting and receiving loop antenna with reactive loading
US4184160A (en) * 1978-03-15 1980-01-15 Affronti Victor A Antenna roof mount for vehicles
GB2028592A (en) * 1978-08-19 1980-03-05 Sony Corp Car antennae
FR2553584A1 (en) * 1983-10-13 1985-04-19 Applic Rech Electronique Half-loop antenna for land vehicle
US4658259A (en) * 1985-03-06 1987-04-14 Blaese Herbert R On-glass antenna
US4764773A (en) * 1985-07-30 1988-08-16 Larsen Electronics, Inc. Mobile antenna and through-the-glass impedance matched feed system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080603A (en) * 1976-07-12 1978-03-21 Howard Belmont Moody Transmitting and receiving loop antenna with reactive loading
US4184160A (en) * 1978-03-15 1980-01-15 Affronti Victor A Antenna roof mount for vehicles
GB2028592A (en) * 1978-08-19 1980-03-05 Sony Corp Car antennae
FR2553584A1 (en) * 1983-10-13 1985-04-19 Applic Rech Electronique Half-loop antenna for land vehicle
US4658259A (en) * 1985-03-06 1987-04-14 Blaese Herbert R On-glass antenna
US4764773A (en) * 1985-07-30 1988-08-16 Larsen Electronics, Inc. Mobile antenna and through-the-glass impedance matched feed system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0605766A1 (en) * 1992-12-31 1994-07-13 Richard Hirschmann GmbH & Co. Vehicle antenna for high frequencies
EP0710998A3 (en) * 1994-11-04 1996-09-18 Daimler Benz Ag Vehicle antenna
EP0817306A2 (en) * 1996-06-19 1998-01-07 Ford Motor Company Limited Improved vehicular radio antennas
EP0817306A3 (en) * 1996-06-19 1999-04-28 Ford Motor Company Limited Improved vehicular radio antennas
EP1064692A1 (en) * 1998-03-19 2001-01-03 Smarteq AB Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies
GB2489802A (en) * 2011-04-07 2012-10-10 Imagination Tech Ltd A vehicle DAB antenna with through window signal coupling and a capacitive ground coupler

Also Published As

Publication number Publication date
EP0515590A1 (en) 1992-12-02
DE9116508U1 (en) 1992-12-24
AU8749791A (en) 1992-07-08

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