EP0429203A1 - Antenna system for a vehicle - Google Patents

Antenna system for a vehicle Download PDF

Info

Publication number
EP0429203A1
EP0429203A1 EP90311970A EP90311970A EP0429203A1 EP 0429203 A1 EP0429203 A1 EP 0429203A1 EP 90311970 A EP90311970 A EP 90311970A EP 90311970 A EP90311970 A EP 90311970A EP 0429203 A1 EP0429203 A1 EP 0429203A1
Authority
EP
European Patent Office
Prior art keywords
antenna
vehicle
car
cable
window
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Withdrawn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
EP90311970A
Other languages
German (de)
French (fr)
Inventor
Pekka Lonka
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.)
Nokia Oyj
Original Assignee
Nokia Mobile Phones 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 Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Publication of EP0429203A1 publication Critical patent/EP0429203A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3283—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle side-mounted antennas, e.g. bumper-mounted, door-mounted

Definitions

  • This invention relates to an antenna system for a vehicle and particularly, but not exclusively, to a car antenna system. More particularly this invention has special, but again not exclusive, reference to a car antenna system designed for cellular handheld radio telephones. It is possible to get handheld radio telephones to function inside a car without interferences by using a car installation kit and connecting it to an antenna mounted on the car roof or in another place favorable for the operation. If there is no car installation kit available, or if such an installation kit is not purchased due to the cost, it is possible to use a separate cable, which is connected to the handheld radio telephone's antenna connector and which is in communication with an antenna outside the car.
  • This antenna system has an inconvenience in that when a change to car operation is made, the cable has to be connected to the antenna connector, whereby the primary antenna of the handheld radio telephone first has to be removed from the connector. When a change is made to portable operation, the cable accordingly has to be disconnected and the primary antenna of the handheld radio telephone connected to the connector. Moreover, this antenna system has a drawback in that the antenna cable connector will get dirty, when it is connected and lies on the floor of the car, and further it will be in the way when the car is used. In accordance with current trends the handheld radio telephones are more and more often equipped with a fixed antenna, without any antenna connector.
  • the object of the present invention is to obviate said drawbacks and to provide an antenna system for a vehicle, particularly for a car, the system connecting the isolated interior of a car or other vehicle with the external radio field, particularly with the cellular network of a radio telephone system.
  • the present invention is defined in the appended claims and provides an antenna system comprising an internal antenna located inside the vehicle and galvanically connected to said antenna outside the vehicle.
  • the external antenna can be located so that its field pattern is optimal with respect to the base station, for example on the roof or in a window of the car, and the external antenna is, with minimal losses, in galvanic communication with the second antenna inside the car, so that signals can travel in both directions.
  • An antenna on the car roof or fastened to a window will transfer the received signal with good strength to the antenna inside the car, which in turn will relay the signal to a receiver, for example a handheld radio telephone with its own antenna located inside the car, the receiver thus receiving a uniform signal with natural fading, and in no way being sensitive to shades caused by the metal body of the car.
  • the uniform field pattern amplifying in the direction of the base station is also utilised during transmission.
  • the internal car antenna may have less directional strength and therefore it can be smaller, forming no obstacle when the car is used.
  • a suitable internal antenna is for example a quarter-wave length flexible plastic coated copper wire fastened to the interior of the car roof.
  • the solution is very inexpensive but highly effective.
  • the antenna system comprises an antenna pair in galvanic contact with each other through the car roof, the internal antenna being a quarter-wave length, flexible plastic coated copper wire fastened to the interior of the car roof.
  • the external antenna can also be a removable antenna fixed to the car roof with a magnet, for example, the external antenna communicating with the internal antenna inside the car via a cable through a body sealing, for example a door packing, or the end of the cable being formed into an internal antenna by stripping the cable.
  • the stripped end of the cable can be connected, for example by a rapid connector, to the car seat.
  • the antenna pair forming the antenna system may also be fastened to a window of the car and galvanically connected by a cable conducted through the window or through a packing between the window and the body.

Abstract

The invention relates to an antenna system for a vehicle and particularly for a radio telephone, the system comprising an antenna (1) fastened to the outside of the vehicle and receiving and/or transmitting signals, the antenna (1) being in galvanic communication (8) with the interior of the vehicle. Inside the vehicle there is an internal antenna (2) connected galvanically to the external antenna (1). The radio telephone includes a separate antenna of its own.

Description

  • This invention relates to an antenna system for a vehicle and particularly, but not exclusively, to a car antenna system. More particularly this invention has special, but again not exclusive, reference to a car antenna system designed for cellular handheld radio telephones. It is possible to get handheld radio telephones to function inside a car without interferences by using a car installation kit and connecting it to an antenna mounted on the car roof or in another place favorable for the operation. If there is no car installation kit available, or if such an installation kit is not purchased due to the cost, it is possible to use a separate cable, which is connected to the handheld radio telephone's antenna connector and which is in communication with an antenna outside the car. This antenna system has an inconvenience in that when a change to car operation is made, the cable has to be connected to the antenna connector, whereby the primary antenna of the handheld radio telephone first has to be removed from the connector. When a change is made to portable operation, the cable accordingly has to be disconnected and the primary antenna of the handheld radio telephone connected to the connector. Moreover, this antenna system has a drawback in that the antenna cable connector will get dirty, when it is connected and lies on the floor of the car, and further it will be in the way when the car is used. In accordance with current trends the handheld radio telephones are more and more often equipped with a fixed antenna, without any antenna connector. The major drawback with these handheld radio telephones is that no separate antenna cable may be connected to them, and the telephone's own antenna is the only connection to the external radio telephone system. Inside the car the telephone may be in the user's pocket, on the seat, on the floor of the car, or in another place unfavorable with respect to the radio field. Directional fading is further very strong inside the car when the car's position changes with respect to the base station. The object of the present invention is to obviate said drawbacks and to provide an antenna system for a vehicle, particularly for a car, the system connecting the isolated interior of a car or other vehicle with the external radio field, particularly with the cellular network of a radio telephone system. The present invention is defined in the appended claims and provides an antenna system comprising an internal antenna located inside the vehicle and galvanically connected to said antenna outside the vehicle. The external antenna can be located so that its field pattern is optimal with respect to the base station, for example on the roof or in a window of the car, and the external antenna is, with minimal losses, in galvanic communication with the second antenna inside the car, so that signals can travel in both directions. An antenna on the car roof or fastened to a window will transfer the received signal with good strength to the antenna inside the car, which in turn will relay the signal to a receiver, for example a handheld radio telephone with its own antenna located inside the car, the receiver thus receiving a uniform signal with natural fading, and in no way being sensitive to shades caused by the metal body of the car. The uniform field pattern amplifying in the direction of the base station is also utilised during transmission. The internal car antenna may have less directional strength and therefore it can be smaller, forming no obstacle when the car is used. A suitable internal antenna is for example a quarter-wave length flexible plastic coated copper wire fastened to the interior of the car roof. The solution is very inexpensive but highly effective. In a preferred embodiment of the invention the antenna system comprises an antenna pair in galvanic contact with each other through the car roof, the internal antenna being a quarter-wave length, flexible plastic coated copper wire fastened to the interior of the car roof. The external antenna can also be a removable antenna fixed to the car roof with a magnet, for example, the external antenna communicating with the internal antenna inside the car via a cable through a body sealing, for example a door packing, or the end of the cable being formed into an internal antenna by stripping the cable. The stripped end of the cable can be connected, for example by a rapid connector, to the car seat. The antenna pair forming the antenna system may also be fastened to a window of the car and galvanically connected by a cable conducted through the window or through a packing between the window and the body. The invention will now be described in greater detail, by way of example, with reference to the accompanying drawings, in which :-
    • Figure 1 shows a side view cross section of an antenna pair arranged through a car roof,
    • Figure 2 shows a side view cross section of an external antenna fixed to a car roof with a magnet and a cable conducted inside between door packings, including a stripped cable end, and
    • Figure 3 shows a side view of an antenna pair arranged in a car window.
    In Figure 1, an antenna system according to the invention has an external antenna at 1 and an internal antenna at 2. The external antenna 1 and the internal antenna 2 form an antenna pair, in which both antennas 1,2 are in galvanic contact 8 with each other. The antenna pair 1,2 is arranged in an opening formed in the car roof 4, and they are fixed to this opening by an insulation 3. In this solution the internal antenna 2 can be a quite simple, quarter-wave length, flexible plastic coated copper wire. In Figure 2, the external antenna 1 is fixed with a magnet 7 to the car roof 4 or other metallic structure of the car. The external antenna 1 is in galvanic contact with the interior of the car via a cable 8, which is conducted through the door packing (not shown), and the end of which is stripped in order to form the internal antenna 2. The internal antenna 2 can be fastened, for example by a rapid connector, to the car seat (also not shown). In Figure 3 the antenna pair 1,2 is fixed to a car window and connected to each other via a galvanic connection, for example a wire 8, conducted through a hole made in the window, the antenna pair 1,2 being fixed to the pane or window of the car with a pane or window connector 6.

Claims (7)

1. An antenna system for a vehicle and particularly for a radio telephone, the system comprising an antenna (1) fastened to the outside of the vehicle and receiving and/or transmitting signals, the antenna (1) being in galvanic communication (8) with the interior of the vehicle, characterised by an antenna (2) located inside the vehicle and in galvanic contact with said antenna outside the vehicle.
2. A system according to claim 1, characterised by the internal antenna (2) being a quarter-wave length, flexible plastic coated copper wire.
3. A system according to claim 2, characterised in that the antenna pair are galvanically connected through the roof (4) of the vehicle.
4. A system according to claim 1, characterised by an external antenna (1) fixed with a magnet (7) to metallic structure (4) of a vehicle, and by a cable (8) conducted from the external antenna (1) to the interior of the vehicle through a body packing, preferably a door packing, the cable end being connected to an internal antenna or being stripped to form an internal antenna (2).
5. A system according to claim 4, characterised in that the metallic structure is the roof (4) of the vehicle.
6. A system according to claim 4 or 5, characterised in that the stripped end of the cable is fastened to a vehicle seat by a rapid release connector.
7. A system according to claim 1, characterised in that the antenna pair (1,2) is fixed to a window (5) of the vehicle and galvanically connected (8) with each other by a cable conducted through the window or through a packing between the window and the vehicle body.
EP90311970A 1989-11-15 1990-11-01 Antenna system for a vehicle Withdrawn EP0429203A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI895448 1989-11-15
FI895448A FI84000C (en) 1989-11-15 1989-11-15 Antenna system for vehicles

Publications (1)

Publication Number Publication Date
EP0429203A1 true EP0429203A1 (en) 1991-05-29

Family

ID=8529358

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90311970A Withdrawn EP0429203A1 (en) 1989-11-15 1990-11-01 Antenna system for a vehicle

Country Status (2)

Country Link
EP (1) EP0429203A1 (en)
FI (1) FI84000C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0431640A2 (en) * 1989-12-08 1991-06-12 Larsen Electronics, Inc. Mobile cellular antenna system
EP0458592A2 (en) * 1990-05-22 1991-11-27 Alliance Research Corporation Passive cellular telephone antenna system
EP1447878A1 (en) * 2003-02-12 2004-08-18 Hirschmann Electronics GmbH & Co. KG Antenna for a radio central locking system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2081211A7 (en) * 1970-03-18 1971-12-03 Saint Gobain
US4613833A (en) * 1984-12-30 1986-09-23 Harada Kogyo Kabushiki Kaisha Transmission channel coupler for antenna
DE3526527A1 (en) * 1985-07-24 1987-01-29 Gerhard Fromm Roof antenna for passenger vehicles and goods vehicles
DE3537107A1 (en) * 1985-10-18 1987-04-23 Licentia Gmbh Radio transmission arrangement on receivers inside vehicles
EP0330780A2 (en) * 1988-03-04 1989-09-06 Herbert Rudolph Blaese Portable antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2081211A7 (en) * 1970-03-18 1971-12-03 Saint Gobain
US4613833A (en) * 1984-12-30 1986-09-23 Harada Kogyo Kabushiki Kaisha Transmission channel coupler for antenna
DE3526527A1 (en) * 1985-07-24 1987-01-29 Gerhard Fromm Roof antenna for passenger vehicles and goods vehicles
DE3537107A1 (en) * 1985-10-18 1987-04-23 Licentia Gmbh Radio transmission arrangement on receivers inside vehicles
EP0330780A2 (en) * 1988-03-04 1989-09-06 Herbert Rudolph Blaese Portable antenna

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0431640A2 (en) * 1989-12-08 1991-06-12 Larsen Electronics, Inc. Mobile cellular antenna system
EP0431640A3 (en) * 1989-12-08 1991-09-04 Larsen Electronics, Inc. Mobile cellular antenna system
EP0458592A2 (en) * 1990-05-22 1991-11-27 Alliance Research Corporation Passive cellular telephone antenna system
EP0458592A3 (en) * 1990-05-22 1992-01-15 Alliance Research Corporation Passive cellular telephone antenna system
EP1447878A1 (en) * 2003-02-12 2004-08-18 Hirschmann Electronics GmbH & Co. KG Antenna for a radio central locking system
US6937197B2 (en) 2003-02-12 2005-08-30 Hirschmann Electronics Gmbh & Co. Kg Antenna for a central locking system of an automotive vehicle

Also Published As

Publication number Publication date
FI84000B (en) 1991-06-14
FI895448A0 (en) 1989-11-15
FI895448A (en) 1991-05-16
FI84000C (en) 1991-09-25

Similar Documents

Publication Publication Date Title
EP0550122A1 (en) Auxiliary antenna
US7081857B2 (en) Arrangement for connecting additional antenna to radio device
EP0829107B1 (en) Antenna coupler for a portable radiotelephone
EP0343848B1 (en) Antenna assembly
EP2003621A3 (en) Door handle for vehicle and smart entry system for vehicle using the same
CA2405045A1 (en) Electrically connected multi-feed antenna system
EP1001485A3 (en) Glass antenna device for vehicle
MXPA97009334A (en) Antenna coupler for a portable radiotelephone
EP1092273A4 (en) A communication system for transmitting and demodulating a communication signal using an adaptive antenna array
EP0856904A3 (en) Glass antenna device for an automobile
EP1093183A2 (en) Antenna equipment and communication terminal equipment
EP1353400A3 (en) Antenna system
FR2724263B1 (en) ANTENNA USED FOR TRANSMITTING OR RECEIVING A RADIO FREQUENCY SIGNAL, A REMOTE TRANSMITTER AND RECEIVER AND A REMOTE CONTROL SYSTEM FOR VEHICLE INCORPORATING THE SAME
EP0936754A3 (en) A wireless telecommunications system architecture supporting receive diversity
EP1001558A3 (en) Communication terminal apparatus and radio communication method with transmission diversity
EP0938158A3 (en) Antenna
EP0468615A1 (en) Cordless antenna
EP0429203A1 (en) Antenna system for a vehicle
EP0994562A3 (en) Device for suppression of radio interference caused by vehicles
EP0940924A3 (en) Mobile terminal equipment for satellite and land mobile radio communication
US5861857A (en) Vehicular windshield wiper antenna system
US6400326B1 (en) Antenna booster system for automobile
JP3048483B2 (en) Antenna integrated receiver and receiving board
JPH02274017A (en) Antenna connector for portable telephone
JP3007576U (en) Vehicle antenna device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19911115

17Q First examination report despatched

Effective date: 19931129

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19940412