EP1686654A1 - Element d'antenne passive pour vitrage de véhicule automobile - Google Patents

Element d'antenne passive pour vitrage de véhicule automobile Download PDF

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Publication number
EP1686654A1
EP1686654A1 EP06100996A EP06100996A EP1686654A1 EP 1686654 A1 EP1686654 A1 EP 1686654A1 EP 06100996 A EP06100996 A EP 06100996A EP 06100996 A EP06100996 A EP 06100996A EP 1686654 A1 EP1686654 A1 EP 1686654A1
Authority
EP
European Patent Office
Prior art keywords
antenna
parasitic element
windscreen
receiving element
parasitic
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.)
Granted
Application number
EP06100996A
Other languages
German (de)
English (en)
Other versions
EP1686654B1 (fr
Inventor
Luigi Cervato
Martino Rosin
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.)
Calearo Antenne SpA
Original Assignee
Calearo Antenne SpA
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 Calearo Antenne SpA filed Critical Calearo Antenne SpA
Publication of EP1686654A1 publication Critical patent/EP1686654A1/fr
Application granted granted Critical
Publication of EP1686654B1 publication Critical patent/EP1686654B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems

Definitions

  • the present invention is about a vehicle antenna suitable in particular to be installed on a windscreen or on other dielectric surfaces of the vehicle.
  • the invention also concerns a windscreen including said antenna.
  • vehicle antennas are known and, in particular, a type of antennas is known, consisting of essentially plane conductive structures disposed on a dielectric like, for instance, the front windscreen.
  • Such antenna structures comprise elements of adequate length to the radio wave frequency to be received and electrically connected to one or more electronic devices which process and demodulate the received signal.
  • a first inconvenience is due to the arrangement of the receiving elements, on the dielectric material surface, which affects their capability to receive radio waves with horizontal and/or vertical polarization, obtaining, in some situations, a bad reception.
  • the stations transmitting radio waves can send signals either with horizontal or vertical polarization.
  • the flat antennas belonging to the prior art are composed by substantially longitudinally developed receiving elements that can be horizontally, vertically or obliquely disposed on the dielectric surface which supports them.
  • the reception of radiofrequency signals related to radio waves having a polarization in accordance with the arrangement of the receiving element/s is optimal, while the reception of radiofrequency signals having an orthogonal polarization with respect to the arrangement of the receiving element represents the worst case.
  • This aspect causes the aforementioned inconvenience in the antennas belonging to the prior art i.e., in other words, it introduces a risk factor in the radio signal reception since, for any provided antenna arrangement, it is much probable that said arrangement is not suitable for the polarization of the waves to be received.
  • a further inconvenience of known flat antenna embodiments is due to the fact that they are not omni directional, i.e. they are not able to correctly receive the radio wave for all the source directions.
  • This inability is related both to the geometrical extent of the receiving element and to its arrangement on the surface associated therewith.
  • the very close presence of metallic parts can cause shield effects for some receiving angles of the radio wave, i.e. the angles according which said shielding parts are disposed aligned with respect to the receiving elements.
  • This effect defines “shadow areas” that can cause transmitted signal losses, and thus information losses, during the vehicle movement.
  • Some antenna embodiments are known in which at least a parasitic element has been added, parallelly disposed with respect to the receiving elements in order to amplify their reception using the parasitic element as a repeater.
  • said embodiments still present the inconvenience of being not omni directional since they mainly receive the electromagnetic waves having a parallel polarization with respect to the direction defined by the receiving and parasitic elements.
  • the present invention intends to overcome all the aforementioned inconveniences.
  • an object of the present invention to provide for an antenna with essentially flat elements which is able to be disposed on a surface of a dielectric belonging to a vehicle and which maximizes the receptivity of its receiving elements, whatever it might be the polarization of the radio waves of the transmitting radio station.
  • a vehicle antenna which, according to the content of the main claim, is able to be coupled with a surface made of dielectric material, comprises at least a mainly longitudinally developed radio wave receiving element, and it is characterized by comprising at least a parasitic element, separated by said at least a receiving element and with mainly longitudinal development, on a side of which said at least a receiving element is disposed, said at least a receiving element and said at least a parasitic element consisting of conductive material strips which define mutually substantially incident development axes.
  • a vehicle windscreen characterized by comprising an antenna having at least a mainly longitudinally developed parasitic element, and at least a receiving element laterally disposed with respect to said parasitic element and separated therefrom, said at least a receiving element and said at least a parasitic element consisting of conductive material strips which define, on the plane defined by said windscreen, mutually substantially incident development axes.
  • the parasitic element and the receiving elements define mutually substantially orthogonal axes on the surface coupled therewith and the parasitic element is galvanically connected to the vehicle mass.
  • the receiving and parasitic elements are made of conductive material, they each provides for receiving elements particularly suited to receive electromagnetic waves with a polarization having the same direction defined by the elements themselves.
  • the parasitic element is disposed along a direction incident to the receiving elements, it is particularly suited to receive also electromagnetic waves with a polarization different from the polarizations mainly received by the receiving elements.
  • the parasitic element amplifies the receptivity of the electromagnetic waves received by the receiving elements and moreover it permits to obtain an antenna which is able to correctly receive also electromagnetic waves having a polarization different from the polarization that the receiving elements are particularly suited to receive.
  • the antenna of the invention is particularly suited to receive electromagnetic waves having mutual orthogonal polarizations, making the reception diagram of the antenna omni directional.
  • the vehicle antenna of the invention is shown in Figure 1, where it is generally indicated with numeral 1 and where one can see that it is disposed on a surface made of dielectric material 2 and it comprises a mainly longitudinally developed parasitic element 3 and two mainly longitudinally developed too receiving elements 4, 5, disposed on both sides of the parasitic element 3.
  • the parasitic element 3 is connected to the ground 6 through a galvanic connection.
  • the parasitic element is connected to the ground through a capacitive coupling.
  • the parasitic element is insulated.
  • the receiving elements 4, 5 provide for a receiving structure connected to an electronic device, which manages the information content of the received radio signal through the interposition of an amplifier.
  • connection between the receiving elements of the antenna and the electronic device is a direct connection.
  • the preferred executive embodiment described hereby corresponds to an antenna whose utilization provides for the two receiving elements working in a complementary way.
  • phase diversity according which both elements receive the same signal, therefore it should be more correct, from a lexical point of view, to mention them as an antenna array and not as an antenna.
  • the receiving elements 4, 5 and the parasitic element 3 consist of a wire made of conductive material inserted in the dielectric.
  • the receiving elements and the parasitic element consist of a strip made of conductive material laid on the dielectric.
  • the receiving elements 4, 5 and the parasitic element 3 define substantially mutually orthogonal directions.
  • the receiving elements and the parasitic element define mutually incident but not orthogonal directions.
  • the dielectric material can be a plastic material or a plastic material reinforced by fiber glass.
  • the antenna 100 is provided with a single receiving element 104.
  • the parasitic element 103 coupled with the element 104 is still disposed in a substantially centred position with respect to the dielectric material surface 102 on which these elements are disposed.
  • the antenna 200 according to the invention is still composed by a single parasitic element 203, disposed in a substantially centred position with respect to the dielectric material surface 202, while the receiving elements 204 are three in number.
  • the antenna 300 is composed by four receiving elements, generally indicated with numeral 307, laterally disposed with respect to the parasitic element 303.
  • these embodiments could provide for a different number of receiving elements and/or a substantially oblique position with respect to the parasitic element, or such a position that the receiving elements and the parasitic element define each an incident direction with respect to the others.
  • the invention also relates to a windscreen that, in its preferred executive embodiment, is shown in Figure 5, where it is generally indicated with numeral 400 and where one can see that it comprises a generally made of glass surface 402 on which a parasitic element 403 and two receiving elements 404 and 405 are disposed, said receiving elements being disposed on both sides of the parasitic element 403.
  • the parasitic element 403 is substantially disposed in the center of the windscreen 400 surface.
  • the windscreen 400 is inserted in the structure of a car, and being said structure made of metallic material and thus forming a shield for radio waves coming from their direction, the parasitic element 403 is in the best position for being affected as little as possible from said shield.
  • the receiving elements 404 and 405 and the parasitic element 403 define mutually orthogonal directions.
  • the parasitic element 403 is galvanically connected to the vehicle mass 406.
  • the parasitic element and the receiving elements define each a substantially incident direction with respect to the others.
  • the parasitic element is connected to the ground through a capacitive coupling or it is insulated.
  • the manufacture of the support surface i.e. the windscreen 402, in which wires of conductive material forming the parasitic element 403 and the receiving elements 404 and 405 are inserted, should be performed.
  • the windscreen glass has to be manufactured at first, and subsequently conductive material strips forming the parasitic element and the receiving elements are laid on it.
  • the bolt is coupled with the body of the vehicle A in order to form a galvanic connection to the ground for the parasitic element 403.
  • the currents 420, 421 and 422 are of different entity due to the different arrangement of the parasitic element 403 with respect to the receiving elements 404, 405.
  • currents 422 are developed, generated in particular by radio wave components coherent with its arrangement and not able to be developed instead in an optimal way on the receiving elements 404, 405.
  • the currents 422 flowing on the parasitic element 403 generate an electric field 425 which induces in its turn additional currents on the receiving elements 404 and 405.
  • the antenna and the windscreen of the invention achieve the intended objects.
  • an essentially flat antenna has been provided, able to be disposed on a dielectric material surface, which maximizes the receptivity of its receiving elements, whatever it might be the polarization of the radio waves transmitted by the transmitting radio station.
  • an antenna with essentially flat elements having a substantially omni directional radiation diagram.

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  • Details Of Aerials (AREA)
EP20060100996 2005-01-28 2006-01-27 Element d'antenne passive pour vitrage de véhicule automobile Expired - Fee Related EP1686654B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI20050022 ITVI20050022A1 (it) 2005-01-28 2005-01-28 Antenna ad elementi parassiti per veicoli e parabrezza che include tale antenna

Publications (2)

Publication Number Publication Date
EP1686654A1 true EP1686654A1 (fr) 2006-08-02
EP1686654B1 EP1686654B1 (fr) 2008-12-31

Family

ID=34956715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060100996 Expired - Fee Related EP1686654B1 (fr) 2005-01-28 2006-01-27 Element d'antenne passive pour vitrage de véhicule automobile

Country Status (3)

Country Link
EP (1) EP1686654B1 (fr)
DE (1) DE602006004484D1 (fr)
IT (1) ITVI20050022A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9270014B2 (en) 2012-08-28 2016-02-23 Acer Incorporated Handheld electronic device
EP3032642A4 (fr) * 2013-08-05 2017-03-08 Asahi Glass Company, Limited Dispositif d'antenne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971029A (en) * 1974-01-14 1976-07-20 Toyota Jidosha Kogyo Kabushiki Kaisha Window antenna device for use in motor vehicle
US5898407A (en) * 1995-09-02 1999-04-27 Flachglas Automotive Gmbh Motor vehicle with antenna window with improved radiation and reception characteristics
US20030156070A1 (en) * 2002-02-21 2003-08-21 Toyota Jidosha Kabushiki Kaisha Vehicular antenna device
JP2005026905A (ja) * 2003-06-30 2005-01-27 Central Glass Co Ltd 車両用ガラスアンテナ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971029A (en) * 1974-01-14 1976-07-20 Toyota Jidosha Kogyo Kabushiki Kaisha Window antenna device for use in motor vehicle
US5898407A (en) * 1995-09-02 1999-04-27 Flachglas Automotive Gmbh Motor vehicle with antenna window with improved radiation and reception characteristics
US20030156070A1 (en) * 2002-02-21 2003-08-21 Toyota Jidosha Kabushiki Kaisha Vehicular antenna device
JP2005026905A (ja) * 2003-06-30 2005-01-27 Central Glass Co Ltd 車両用ガラスアンテナ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9270014B2 (en) 2012-08-28 2016-02-23 Acer Incorporated Handheld electronic device
EP3032642A4 (fr) * 2013-08-05 2017-03-08 Asahi Glass Company, Limited Dispositif d'antenne

Also Published As

Publication number Publication date
ITVI20050022A1 (it) 2006-07-29
DE602006004484D1 (de) 2009-02-12
EP1686654B1 (fr) 2008-12-31

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