EP1686646A1 - Réseau d'antennes pour automobile - Google Patents

Réseau d'antennes pour automobile Download PDF

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Publication number
EP1686646A1
EP1686646A1 EP06100998A EP06100998A EP1686646A1 EP 1686646 A1 EP1686646 A1 EP 1686646A1 EP 06100998 A EP06100998 A EP 06100998A EP 06100998 A EP06100998 A EP 06100998A EP 1686646 A1 EP1686646 A1 EP 1686646A1
Authority
EP
European Patent Office
Prior art keywords
antenna array
conductive elements
coupled
rear window
feeding element
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.)
Ceased
Application number
EP06100998A
Other languages
German (de)
English (en)
Inventor
Luigi Cervato
Emanuele Bruno Bodini
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 EP1686646A1 publication Critical patent/EP1686646A1/fr
Ceased 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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H01Q1/1278—Supports; Mounting means for mounting on windscreens in association with heating wires or layers
    • 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 array suitable in particular to be installed on the rear window of said vehicle to receive radio waves.
  • radio waves related to radiofrequency signals like, for instance, mobile telephony, FM radio, AM radio, satellite navigation systems and other signals, including television signals.
  • phase diversity a particular reception technique called "phase diversity", which is explained hereinafter, is also known.
  • the radio wave transmitted by the transmitting station reaches the receiving antenna through a path having numerous obstacles, represented by buildings and orographic obstacles like hills or mountains.
  • Each of said obstacles has also the effect to deviate the radio waves that hit it.
  • the final result is that the receiving antenna is hit by numerous radio waves emitted by the same source and containing the same information, but coming from different directions and in different times.
  • phase diversity in which two receiving antennas are used, and a phase displacement and attenuation between the two or more received signals are subsequently dynamically introduced, so that the resulting signal is qualitatively better.
  • the use of two or more mutually spaced antennas, whose distance is equal to half the wavelengths of the radio wave band that the antenna is able to receive resulted to be optimal.
  • a proper circuit belonging to the electronic circuit processing the received radio signals, provides for properly combining the two signals to obtain a better quality signal.
  • phase diversity simultaneously uses more receiving antennas whose received radiofrequency signals are added in order to obtain a better resulting signal.
  • Such technique is different from another technique called "scan diversity", an example of which is described in the Patent JP 58070645, according to which more antennas are used, but they are not simultaneously working.
  • a kind of vehicle antennas belonging to the prior art provides for the utilization of a plurality of conductors disposed on a dielectric material surface, said surface generally consisting of the rear window of the vehicle.
  • a solution of this problem due to the coexistence of the antenna and the heated rear window in the same glass, provides for the disposition of conductive elements orthogonal to the heated rear window conductors, said conductive elements interconnecting unipotential points so that the defrosting current distribution is not altered.
  • the heated rear window acts as a metallic surface able to receive radiofrequency waves.
  • the heated rear window causes low frequency noises on the antenna affecting, in an irremediable way in some cases, the correct reception of the AM band signals.
  • the heated rear window is electrically connected to the motor vehicle starter battery, and this connection causes a lot of low frequency noises due to other car devices.
  • Such inconvenience is particularly relevant for the extraction of AM band radiofrequency signals from the antenna through a direct electric connection.
  • a motor vehicle antenna array of the kind coupled with a substantially flat dielectric system which, according to the content of the main claim, comprises:
  • the dielectric element is the motor vehicle rear window, and the conductors belonging to the first plurality of conductive elements are arranged substantially parallel to each other to form the heating elements of the heated rear window.
  • the feeder is substantially parallel disposed with respect to the first conductive elements and it is separated therefrom.
  • the feeder capacitive coupling with the heated rear window and the disposition of the extraction points of the radiofrequency signal received on said feeder allow to solve the aforementioned inconvenience of the presence of low frequency noises which occur for signal extraction points galvanically connected to the heated rear window.
  • the vehicle antenna array of the invention is shown in Figure 1, where it is generally indicated with numeral 1 and where one can see that it is supported on a substantially flat dielectric element 2 and it comprises a first plurality of generally mutually parallel electrically conductive elements 3, interconnected at their heads and coupled with a feeding source 4.
  • a second plurality of electrically conductive elements 5 is furthermore present, each of them being disposed between a pair of conductive elements belonging to the first plurality 3.
  • a feeding element 6 of radiofrequency signals coming from the antenna 1 is another component of the antenna array of the invention.
  • the feeding element 6, which is capacitively coupled with the first and second plurality of conductive elements 3 and 5, is provided with two extraction points 10, 11 of radiofrequency signals, mutually spaced according to a distance substantially equivalent to the half of one of the wavelength related to the radiofrequency signals that the antenna array 1 is able to receive.
  • the extraction points are more than two, and they are mutually spaced according to distances independent from the wavelength of the radio waves related to the radiofrequency signals that the antenna array is able to receive.
  • the dielectric element 2 in the preferred executive embodiment shown in Figure 2 it is the rear window of a motor vehicle A.
  • the conductors of the first plurality of conductive elements 3 in the preferred executive embodiment they consist of strips of conductive materials, supported on the rear window 2 of the motor vehicle A and able to perform the function of heated rear window.
  • the short circuited ends of all the conductive elements belonging to the first plurality of conductive elements 3 are electrically connected to a feeding source 4 which, in the preferred executive embodiment, is the starter battery of the motor vehicle A.
  • the conductive elements of the second plurality of conductive elements 5 consist of a strip of conductive material supported on the rear window 2 of the motor vehicle A.
  • Each of said conductive elements of the second plurality of conductive elements 5 is disposed between a pair of conductive elements belonging to the first plurality of conductive elements 3 and they form, together with said conductive elements belonging to the first plurality of conductive elements 3, a composite structure 20 in which substantially polygonal shapes are obtained.
  • the feeding element 6 is provided with two signal extraction points 10, 11; said extraction points 10, 11 are mutually spaced according to a distance substantially equal to the half of one of the wavelength of the radio waves related to the radiofrequency signal that the antenna array 1 is able to receive.
  • It is made of conductive material and, in the preferred executive embodiment, it consists of conductive material strips laid down on the surface of the rear window 2 of the motor vehicle A.
  • Said conductive material strips are parallelly and closely disposed with respect to the conductive elements belonging to the first plurality of conductive elements 3 in order to form a capacitive coupling.
  • the electronic device 15 comprises, among others, an electronic circuit for performing the aforementioned "phase diversity" function.
  • the amplifier is not present and the extraction points are directly connected to the signal processing electronic device.
  • a circuit for processing radio signals related to the AM radio and a circuit for processing radio signals related to the FM radio are furthermore present in the electronic device 15.
  • electronic circuits for the satellite navigation system, mobile telephony or television signal are also or alternatively connected to the antenna array of the invention.
  • the conductive elements and the feeding element consist of conductive filaments embedded in the dielectric.
  • the antenna array 1 of the invention is applied on the rear window 2 of the motor vehicle A and, in operative conditions, it also performs the function of heated rear window 2 for the motor vehicle A.
  • a global current is thus generated, able to be extracted from said antenna array 1 and to be sent to the amplifier 16 and from here to the electronic device 15 processing the received signals.
  • the extraction takes place through the feeding element 6.
  • said feeding element 6 is separated from the first and second plurality of conductive elements 3, 5 and it is capacitively coupled therewith, the advantage that the radio signals extracted in this way are not affected by the low frequency noises typical of the signal extraction points galvanically connected to a heated rear window is thus obtained.
  • the antenna array of the invention advantageously allows to optimise the reception of said signals through the "phase diversity" technique.
  • the signals extracted from the feeder 6 are sent to the electronic device 15 which processes them by means of the two extraction points 10, 11 electrically connected to said electronic device 15 through the interposition of the amplifier 16.
  • the vehicle antenna array of the invention achieves all the intended objects.
  • an antenna array for a motor vehicle rear window has been provided, being coexistent with the heated rear window without requiring to add low frequency filters between the heated rear window feeding and said heated rear window.
  • an antenna array for a motor vehicle rear window has been provided, allowing to implement the "phase diversity" technique.

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  • Details Of Aerials (AREA)
EP06100998A 2005-01-28 2006-01-27 Réseau d'antennes pour automobile Ceased EP1686646A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI20050023 ITVI20050023A1 (it) 2005-01-28 2005-01-28 Sistema di antenne per veicoli

Publications (1)

Publication Number Publication Date
EP1686646A1 true EP1686646A1 (fr) 2006-08-02

Family

ID=34956716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06100998A Ceased EP1686646A1 (fr) 2005-01-28 2006-01-27 Réseau d'antennes pour automobile

Country Status (3)

Country Link
EP (1) EP1686646A1 (fr)
DE (1) DE202006020814U1 (fr)
IT (1) ITVI20050023A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102934282A (zh) * 2010-06-14 2013-02-13 法国圣戈班玻璃厂 具有改善信噪比的天线配置和天线构造

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870645A (ja) * 1981-10-22 1983-04-27 Toyota Motor Corp 自動車用受信装置
WO2002056412A2 (fr) * 2001-01-04 2002-07-18 Nippon Sheet Glass Co., Ltd. Antenne de vitre et systeme d'antenne de vitre la comprenant
US20030197650A1 (en) * 2002-04-23 2003-10-23 The Ohio State University Layout for automotive window antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870645A (ja) * 1981-10-22 1983-04-27 Toyota Motor Corp 自動車用受信装置
WO2002056412A2 (fr) * 2001-01-04 2002-07-18 Nippon Sheet Glass Co., Ltd. Antenne de vitre et systeme d'antenne de vitre la comprenant
US20030197650A1 (en) * 2002-04-23 2003-10-23 The Ohio State University Layout for automotive window antenna

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 162 (E - 187) 15 July 1983 (1983-07-15) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102934282A (zh) * 2010-06-14 2013-02-13 法国圣戈班玻璃厂 具有改善信噪比的天线配置和天线构造
CN102934282B (zh) * 2010-06-14 2015-10-14 法国圣戈班玻璃厂 具有改善信噪比的天线配置和天线构造

Also Published As

Publication number Publication date
DE202006020814U1 (de) 2010-05-27
ITVI20050023A1 (it) 2006-07-29

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