WO1999035709A1 - Systeme d'antenne essentiellement destine a un vehicule - Google Patents

Systeme d'antenne essentiellement destine a un vehicule Download PDF

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Publication number
WO1999035709A1
WO1999035709A1 PCT/SE1998/002281 SE9802281W WO9935709A1 WO 1999035709 A1 WO1999035709 A1 WO 1999035709A1 SE 9802281 W SE9802281 W SE 9802281W WO 9935709 A1 WO9935709 A1 WO 9935709A1
Authority
WO
WIPO (PCT)
Prior art keywords
base
pane
antenna assembly
characteri
frequency band
Prior art date
Application number
PCT/SE1998/002281
Other languages
English (en)
Inventor
Tony BJÖRKMAN
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
Priority claimed from SE9800039A external-priority patent/SE509550C3/sv
Application filed by Allgon Ab filed Critical Allgon Ab
Priority to AU20799/99A priority Critical patent/AU2079999A/en
Publication of WO1999035709A1 publication Critical patent/WO1999035709A1/fr

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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation

Definitions

  • the present invention relates to an antenna assembly for transmitting and receiving high frequency RF-signals for communication apparatus in vehicles, where the assembly is mounted on a non-conductive surface such as a vehicle windshield.
  • antennas for communication apparatus in vehicles comprise only a single frequency band.
  • U.S. Pat. No 5,457,468 such an antenna assembly for radio and communication apparatus is described.
  • the antenna assembly can be mounted on a non-conductive surface, such as a window, and includes an antenna radiator fixed to an electrically conductive base.
  • This base is a first part of a coupling capacitance, transferring the RF-signal through the window.
  • a connection unit interacting with the base is placed on the inside of the window, directly opposite the base.
  • a coaxial cable from the vehicle's radio or communication apparatus is connected to this unit, which comprises a box with a second part of said coupling capacitance and an impedance adjusting means, such as a matching circuit, including a ground plane.
  • the assembly includes two pair of conducting plates, one pair mounted on each side of a windshield, each pair opposite the other pair.
  • a coaxial cable is coupled to the inside pair of plates and a matching circuit is connected across the outside pair of plates.
  • An antenna is connected to the output of the matching circuit.
  • the coaxial cable is thus coupled directly through the windshield, without an intervening matching network.
  • the antenna assembly comprises similar parts as described in U.S. Pat. No 5,457,468, except that the antenna radiator is tuned for dual frequencies and that the matching circuit on the j-nside of the window is adjusted to dual resonating frequencies. A good performance in both frequency bands has been difficult to achieve this way.
  • the object of the invention is to provide an antenna assembly of the type mentioned above in the first paragraph, operational with good performance in at least dual frequency bands.
  • an antenna assembly including at least one antenna radiator fixed to an electrically conductive base.
  • This base is a first part of a coupling capacitance transferring the RF- signal through a dielectric pane.
  • a connection unit interacting with the base is placed on the inside of the pane directly opposite the base.
  • a coaxial cable from the vehicle's radio or communication apparatus is connected to this unit, which comprises a box of at least partially electrically conductive material, having at least two plates facing towards the pane, where a first plate connected in series with a first connection conductor is tuned for a first frequency band and a second plate connected in series with a second connection conductor is tuned for a second frequency band.
  • connection conductors are attached to the coaxial antenna conductor.
  • the plates are interacting with at least said conductive base mounted on the outside of the pane, which can be of any kind of non-conductive material as long as the dielectric properties of the material allows transfer of signals with desired impedance for the coupling capacitance's that forms between the base and the plates.
  • An advantage with the present invention is that a single antenna assembly can be used for any communication apparatus operating in dual frequency bands, such as GSM 900/1800 MHz.
  • Another advantage is that the present invention allows an antenna to be mounted and dismounted without any damage to the vehicle .
  • Yet another advantage is that the present invention allows separate matching circuits for the different frequency bands, which in turn gives an increased performance of the antenna.
  • Fig. 1 is an explanatory sketch of a suggested outer antenna radiator for dual frequency bands.
  • Fig. 2 is a schematic section of the connection unit mounted on the inside of the pane and the base mounted on the outside of the pane.
  • Fig. 3 is a schematic section of the connection unit with an alternative attachment of the coaxial cable to the connection conductors .
  • Fig. 4 is a sectional view of the inside of the connection unit according to a preferred embodiment of the invention.
  • Fig. 5 and 6 are side views of alternative embodiments of the connection unit.
  • An antenna assembly comprising an outer module 1 according to fig 1 including a radiator with a first radiating part 16 and a second radiating part 17, where said -first part 16 is tuned for a first frequency band and said first and second radiating part 16, 17 together are tuned for a second lower frequency band.
  • the first and second part 16, 17 of the radiator is in electrical contact with each other and the radiator is in electrical contact with an electrical conductive base 15, which is mounted against a first side of a pane, e.g. the outside of a windshield utilising self adhesive tape.
  • the impedance of the system is determined by the length and the design of the radiator in combination with matching circuits in a connection unit mounted to a second side, directly opposite to the first side, of the pane, e.g. the inside of said windshield.
  • connection unit 20, 30 comprising a box 14 of at least partially electrically conductive material, including a ground plane 13, constitute, together with the base 15 on the outside of the plane, the connection for transmitting radio waves from and to the radiator 16, 17 to and from a communication radio in the vehicle via an antenna lead 6.
  • the box has an open primary side facing towards the inside of the pane 18 and is situated directly opposite the base 15.
  • this primary side consist of a printed circuit board (not shown) incorporating controlling means for capacitances and/or inductances in the form of conductive plates 10, 12, and connection conductors 9, 11.
  • a part of or the whole ground plane 13 may also be incorporated on the printed circuit board and connected to an outer conductor 7 of a coaxial cable 6.
  • the primary side of the box 14 is covered at least partly with a adhesive material, for instance double-sided tape (not shown) , to attach the box to the inside of the pane 18.
  • a housing 5 of the outer module 1 is attached in a similar way to the outside of the pane 18, where the base 15 comprises at least one base plate arranged directly opposite the conductive plates 10, 12 on the inside of the pane 18.
  • the base 15 is directly connected to the first radiating part 16 of the outer module.
  • An alternative way (not shown) of implementing the invention is to provide the same number of base plates of the base 15 corresponding to the number of conductive plates 10, 12 on the inside of the pane 18.
  • a conductor 8 of the coaxial cable 6 is connected to a first connection conductor 9 in series with a first conductive plate 10, and a second connection conductor 11 in series with a second conductive plate 12.
  • the purpose of the connection conductors 9, 11 is to match the conductive plates 10, 12 and the ground plane 13 in such a way that RF-signals in a first frequency band, e.g. 1800 MHz band, mainly is coupled through the pane via the first conductive plate 10 and the base 15, and RF-signals in a second frequency band, e.g. 900 MHz band, mainly is coupled through the pane via the second conductive plate 12 and the base 15.
  • the critical dimensions are the size of the conductive plates 10, 12 and the base 15, and the length and the design of the connection conductors 9, 11 and the ground plane 13.
  • a first link via the first radiating part 16 and the base plate 15 of the outer module 1, the first conductive plate 10 and the first connection conductor 9 has a matched impedance corresponding to a first frequency band, e.g. 1800 Mhz to match the impedance of the coaxial cable 6.
  • a second link via the first and second part 16, 17 and the base plate 15 of the outer module 1, the second conductive plate 12 and the second connection conductor 11 has a matched impedance corresponding to a second frequency band, e.g. 900 Mhz to match the impedance in said coaxial cable 6.
  • the coaxial cable is an antenna lead connected to a radio or communication apparatus and used as a part of a system.
  • the radiator connected to the base plate 15 may also be of a type that is constructed for a single frequency band, which results in an antenna assembly adjusted only to one frequency band.
  • Figure 3 shows an alternative embodiment of the matching circuit of a connection unit 30, where a first end of an inductance 19 connects to the second connection conductor 11 in series with the second conductive plate 12, a second end of said inductance 19 connects to the conductor 8 of the coaxial cable 6.
  • Figure 4 shows a main printed circuit board 40 and a second printed circuit board 41, with a sectioned ground plane, constituting an embodiment of the present invention, comprising a connection conductor 9 and a first plate 10, tuned for a first frequency, and an interconnection 11 and a second plate
  • connection conductor 9 in series with the printed board circuit 11 and the second plate 12 is tuned for a second lower frequency as described previously.
  • the connection conductor 9 is a conductor 8 of a stripped part of a coaxial cable 6.
  • an outer conductor 7 of the coaxial cable 6 is connected to a ground plane 13, built into the second circuit board 41.
  • FIG. 13 shows two alternative ways of connection the plates 10, 12 to the coaxial cable 6. Instead of implementing the connection between plate 10 and 12 in a printed board circuit, the connection is made by a wire 11, as shown in figure 5, or by a wire 11 and an inductor 19, as shown in figure 6. These embodiments are more expensive to manufacture, but have the advantage of a better performance compared to the embodiment shown in figure 4.
  • connection conductors 9, 11 physically are attached to the conductive plates 10, 12.
  • the best performance is obtained when the attachments are as close as possible to the center of respective conductive plates.
  • the base 15 in previously described embodiments of the present invention comprises at least one base plate facing the pane, where said base plate is connected to the first and second part 16, 17 of the radiator.
  • the first and second conductive plate 11, 12 are capacity-coupled, through the pane 18, to the base plate of the base 15.

Landscapes

  • Details Of Aerials (AREA)

Abstract

L'invention concerne un système d'antenne, comprenant un module externe (1) comportant au moins un élément rayonnant (16, 17) fixé à une base électriquement conductrice (15) comprenant au moins une plaque de base. Cette base constitue un premier élément d'une capacitance de couplage transférant les signaux RF par un panneau diélectrique. Une unité de connexion (20, 30) en interaction avec la base (15) est montée sur la face intérieure du panneau directement opposé à la base. Un câble coaxial (6) de la radio du véhicule ou d'un appareil de communication est connecté à cette unité (20, 30). Cette dernière comprend un boîtier (14) qui est réalisé dans un matériau au moins partiellement conducteur et possède au moins deux plaques (10, 12) opposées au panneau. La première plaque (10) en série avec un premier conducteur de connexion (9) est accordée sur une première bande fréquence et une seconde plaque (12) en série avec un second conducteur de connexion (11) est accordée sur une deuxième bande fréquence. L'autre extrémité des conducteurs de connexion est fixée au câble coaxial (6).
PCT/SE1998/002281 1998-01-09 1998-12-10 Systeme d'antenne essentiellement destine a un vehicule WO1999035709A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20799/99A AU2079999A (en) 1998-01-09 1998-12-10 Antenna device mainly for use in a vehicle

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE9800039-1 1998-01-09
SE9800039A SE509550C3 (sv) 1998-01-09 1998-01-09 Radioantenn foer i huvudsak fordon
SE9801248-7 1998-04-08
SE9801248A SE511431C2 (sv) 1998-01-09 1998-04-08 Antennanordning huvudsakligen för användning i ett fordon

Publications (1)

Publication Number Publication Date
WO1999035709A1 true WO1999035709A1 (fr) 1999-07-15

Family

ID=26663183

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/002281 WO1999035709A1 (fr) 1998-01-09 1998-12-10 Systeme d'antenne essentiellement destine a un vehicule

Country Status (4)

Country Link
AU (1) AU2079999A (fr)
DE (1) DE29822825U1 (fr)
SE (1) SE511431C2 (fr)
WO (1) WO1999035709A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022196970A1 (fr) * 2021-03-16 2022-09-22 삼성전자 주식회사 Dispositif électronique comprenant une unité d'alimentation d'antenne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19929689A1 (de) * 1999-06-29 2001-01-11 Siemens Ag Integrierbare Dualband-Antenne
DE10040307A1 (de) * 2000-08-14 2002-03-07 Comsys Comm Systems Service Gm Passiver Repeater für Mobilfunkanwendungen
DE20221959U1 (de) 2002-05-16 2009-11-19 Kathrein-Werke Kg Antennenanordnung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4764773A (en) * 1985-07-30 1988-08-16 Larsen Electronics, Inc. Mobile antenna and through-the-glass impedance matched feed system
EP0431640A2 (fr) * 1989-12-08 1991-06-12 Larsen Electronics, Inc. Système d'antenne pour système de radio mobile cellulaire
US5457468A (en) * 1990-07-06 1995-10-10 Allgon Ab Automobile antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4764773A (en) * 1985-07-30 1988-08-16 Larsen Electronics, Inc. Mobile antenna and through-the-glass impedance matched feed system
EP0431640A2 (fr) * 1989-12-08 1991-06-12 Larsen Electronics, Inc. Système d'antenne pour système de radio mobile cellulaire
US5457468A (en) * 1990-07-06 1995-10-10 Allgon Ab Automobile antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022196970A1 (fr) * 2021-03-16 2022-09-22 삼성전자 주식회사 Dispositif électronique comprenant une unité d'alimentation d'antenne

Also Published As

Publication number Publication date
AU2079999A (en) 1999-07-26
SE9801248D0 (sv) 1998-04-08
SE9801248L (sv) 1999-07-10
SE511431C2 (sv) 1999-09-27
DE29822825U1 (de) 1999-03-04

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