EP0464127B1 - Mobile communications antenna - Google Patents

Mobile communications antenna Download PDF

Info

Publication number
EP0464127B1
EP0464127B1 EP90905715A EP90905715A EP0464127B1 EP 0464127 B1 EP0464127 B1 EP 0464127B1 EP 90905715 A EP90905715 A EP 90905715A EP 90905715 A EP90905715 A EP 90905715A EP 0464127 B1 EP0464127 B1 EP 0464127B1
Authority
EP
European Patent Office
Prior art keywords
antenna
base
glass pane
housing
connection device
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.)
Expired - Lifetime
Application number
EP90905715A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0464127A1 (en
Inventor
Ulf Saldell
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.)
Allgon AB
Original Assignee
Allgon AB
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 Allgon AB filed Critical Allgon AB
Publication of EP0464127A1 publication Critical patent/EP0464127A1/en
Application granted granted Critical
Publication of EP0464127B1 publication Critical patent/EP0464127B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01Q1/27—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
    • 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

  • a radio antenna for vehicles for mounting against a glass pane on a vehicle and including an antenna rod fastened to an electrically conductive base, which is mounted against the outside of the glass pane, a connection device coacting with the base and mounted on the inside of the glass pane directly opposite the base, an antenna cable in the form of a coaxial cable connecting the vehicle radio with the connection device, the connection device comprising a housing of at least partially electrically conductive material and which has an open side facing towards the base, the housing being mounted against the glass pane with the aid of a plate of non-conductive material covering the open side, whereby a connection extends insulated through the housing between the end of the antenna cable conductor and an opposing plane on the inside of the glass pane, said opposing plane lying in the covering plate directly opposite the base of the antenna.
  • the present invention has the object of improving known constructions so that the antenna can be mounted on any kind of dielectric plates, i.e. not solely glass, and that there is the possibility of removing the mounting if so desired. It is also endeavoured to connect the cable from the communication radio to the connection device so that a capacitance can be formed with the assistance of the connection.
  • the antenna rod together with its mounting determines the impedance of the system. Then radio signals or waves are transferred from the antenna rod via its base to a connection device by the base and a part in the connection device forming a capacitor. Since the connection device is insulated in relation to the vehicle body, the vehicle does not participate in forming the antenna earth, and the antenna is thus usable as a standard component independent of the vehicle body configuration and size.
  • Fig. 1 is a side view partially in section of a mounting for the antenna rod.
  • Fig. 2 is plane view of the mounting.
  • Fig. 3 is a cross section of the connection device for mounting on the inside of the glass pane.
  • Fig. 4 is a section through the connection device along the line IV-IV in Fig. 3.
  • Fig. 5 schematically illustrates an alternative embodiment of the connection device.
  • the mounting for the antenna rod comprises a circular metallic base 1.
  • the base In its central region the base has two upstanding lugs 2 and 3, and between these the lower end of the antenna is mounted with the aid of a pipeting pin 4 which allows the antenna to be swung round the pin from an upright positon illustrated in Fig. 1 to a position turned 90° and illustrated by chain dotted lined.
  • the antenna is preferably mounted on a small rod 5 which is pivotably mounted on the lugs 2 and 3.
  • the outer end of the rod 5 is provided with a thread 6 or engaging an internal thread on the antenna, enabling the lug to be attached to the rod 5 and removed when so desired.
  • the base 1 is made from electricly conductive material and is mounted against the outside of the windshield with aid of such as double-sided tape 7. Impedance is determined by the antenna length and configuration as well as by the base 1.
  • the box has an open side facing towards the inside of the windshield and directly opposite the base 1.
  • this open side is covered by a disc 9 which in the present case is a circuit card which can contain control means for capacitance and/or inductance.
  • the outside of the disc 9 is covered by a double-sided tape 10. Through the centre of the disc there extends a pin 11 which has an enlarged end 12 enabling the formation of a small disc-like surface. This surface constitutes the opposing plane forming together with the base the capacitor connection in the connection device.
  • the pin 11 is connected to a wire loop 13 which is insulated against the box 8 and extends through the side wall of the box and can be connected to the conductor in a cable which is connected to the communication radio in the vehicle.
  • the wire loop 13 has, in a plane parallel to the disc 9, a specific form which is to be seen in Fig. 4. This form can be said to correspond to that of a hook.
  • the loop 13 is connected to a capacitor plate 14, the configuration of which is approximately rectangular and which is also apparent from Fig. 4.
  • the capacitor plate has a given spacing from the bottom of the box 8 and this spacing can be varied with the aid of an insulated screw 15.
  • an insulation disc 16 Between the capacitor plate 14 and the bottom 20 of the box 8 is an insulation disc 16, which has an upwardly bent side 17 extending a distance upwards into the box.
  • the side 17 covers a sleeve 18 projecting inwardly in the box 8.
  • the wire loop 13 extends into the sleeve 18 and is insulated against it.
  • the sleeve 18 receives the cable going to the communication radio, and the chief of this cable passes into the sleeve 18 and its conductor connects to the part 19 of the wire loop 13 extending inwards into the sleeve 18.
  • the conductor of the cable from the communication radio thus connects via the part 19 and via loop 13 to the pin which is connected via a capacitor to the antenna.
  • a further capacitor circuit is formed by the capacitor plate 14 and the bottom 20 of the of the box 8, and this capacitor circuit is connected to the cable to the communication radio via the loop 13 and part 19. It will be seen from Figs. 3 and 4 that the wire loop 13 and its part 19 are insulated from the sleeve 18 with the aid of an insulator 21 placed in the sleeve.
  • a variant is illustrated in Fig. 5 and differs from what is shown in Fig. 3 in that the capacitor plate 14 is lacking and in that the loop 13 has another configuration. Instead of the loop 13 there is a connection between the part 19 and the pin 11 in the form of a loop circuit 22.
  • This circuit has a certain extension in the plane parallel to the bottom plane 20 of the box 8 and is disposed so closed to the bottom 20 that it forms one side of a capacitor where the other side is the bottom 20, and there is an intermediate insulation disc 16 between them in the same way as in the previous embodiment.
  • the box 8 has been described as being made of metal. However, this is not necessary, and what is important is that there is at least some metal surface in the box, so that the capacitance between the wire loop 13 and the metal part of the box can be formed. In addition, so-called stray capacitances and at least on stray capacitance can be said to be formed between the enlarged part 12 of the pin 11 and the metal part in the box 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
EP90905715A 1989-03-17 1990-03-16 Mobile communications antenna Expired - Lifetime EP0464127B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE8900965 1989-03-17
SE8900965A SE463285B (sv) 1989-03-17 1989-03-17 Radioantenn foer fordon
PCT/SE1990/000171 WO1990011627A1 (en) 1989-03-17 1990-03-16 Mobile communications antenna

Publications (2)

Publication Number Publication Date
EP0464127A1 EP0464127A1 (en) 1992-01-08
EP0464127B1 true EP0464127B1 (en) 1995-08-23

Family

ID=20375390

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90905715A Expired - Lifetime EP0464127B1 (en) 1989-03-17 1990-03-16 Mobile communications antenna

Country Status (4)

Country Link
EP (1) EP0464127B1 (sv)
DE (1) DE69021875T2 (sv)
SE (1) SE463285B (sv)
WO (1) WO1990011627A1 (sv)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0405865D0 (en) * 2004-03-16 2004-04-21 Jesman Andrew Matching element for mobile antenna

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089817A (en) * 1976-10-12 1978-05-16 Stephen A. Denmar Antenna system
CA1223339A (en) * 1983-09-23 1987-06-23 James Hadzoglou Cellular mobile communications antenna
US4658259A (en) * 1985-03-06 1987-04-14 Blaese Herbert R On-glass antenna
US4779098A (en) * 1987-01-22 1988-10-18 Blaese Herbert R Modified on-glass antenna with decoupling members

Also Published As

Publication number Publication date
SE8900965D0 (sv) 1989-03-17
WO1990011627A1 (en) 1990-10-04
EP0464127A1 (en) 1992-01-08
SE8900965L (sv) 1990-09-18
DE69021875T2 (de) 1996-04-25
SE463285B (sv) 1990-10-29
DE69021875D1 (de) 1995-09-28

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