EP2026473B1 - Antenne avec système de correspondance d'impédance pour véhicules automobiles - Google Patents

Antenne avec système de correspondance d'impédance pour véhicules automobiles Download PDF

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Publication number
EP2026473B1
EP2026473B1 EP20070113394 EP07113394A EP2026473B1 EP 2026473 B1 EP2026473 B1 EP 2026473B1 EP 20070113394 EP20070113394 EP 20070113394 EP 07113394 A EP07113394 A EP 07113394A EP 2026473 B1 EP2026473 B1 EP 2026473B1
Authority
EP
European Patent Office
Prior art keywords
antenna
conductor
matching system
wire
coaxial cable
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.)
Active
Application number
EP20070113394
Other languages
German (de)
English (en)
Other versions
EP2026473A1 (fr
Inventor
Enrique c/o Advanced Automotive Antennas S.L. Martinez Ortigosa
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.)
Advanced Automotive Antennas SL
Original Assignee
Advanced Automotive Antennas SL
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 Advanced Automotive Antennas SL filed Critical Advanced Automotive Antennas SL
Priority to ES07113394T priority Critical patent/ES2352049T3/es
Priority to DE200760010135 priority patent/DE602007010135D1/de
Priority to EP20070113394 priority patent/EP2026473B1/fr
Priority to PCT/EP2008/059634 priority patent/WO2009016076A1/fr
Publication of EP2026473A1 publication Critical patent/EP2026473A1/fr
Application granted granted Critical
Publication of EP2026473B1 publication Critical patent/EP2026473B1/fr
Active 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
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles

Definitions

  • This invention relates generally to an improved system for connecting an integrated antenna to a car's ground point, which provides a maximum profit in terms of the antenna's dimension and efficiency, getting the best performance between antenna's dimension and antenna's gain.
  • the connection system can also be used when the antenna is connected to a high-frequency device such as an amplifier or a diversity module.
  • connection between the integrated antenna and the ground point in the car has a big impact in the antenna's performance. If the wire of connection follows a long distance close to the chassis of the car, the antenna's efficiency is decreased, and therefore the antenna's reception level is also decreased. The antenna's impedance is also modified increasing the mismatch losses between the antenna and the radio receiver.
  • this connection modifies the frequency of resonance of the antenna which may not be optimized for that reason for the reception at the desired frequency for which the antenna has been designed.
  • the Fakra connector used in the present invention is know in the prior-art and is described for instance in the European Patent EP-1.345.290 .
  • the present invention is defined in claim 1 and refers to an antenna matching system for motor vehicles which comprises an antenna element, a wire and a coaxial cable having a feeder conductor within a shielding conductor.
  • Said wire is connected between the antenna element and a first end of said feeder conductor.
  • a first end of the shielding conductor closer to said first end of the feeder conductor is open so that the coaxial cable is not shielded.
  • Said shielding conductor has a connection point at a selected distance from said first end, wherein said connection point is connected to a ground connection point of a vehicle.
  • the length of the wire is selected to provide an inductive effect which substantially cancels the capacitive component of the antenna at the band of operation.
  • a particular coaxial cable has to be selected to obtain the appropriate value of capacitance.
  • the inductive effect added at the antenna's impedance could be adjusted to minimize the reactance at the band of operation. This length is adjusted to obtain a null reactance at the center frequency of the band of operation.
  • the length of this coaxial has an inductive effect, useful to compensate (to cancel) the capacitive component of the antenna's reactance.
  • This new form of connection allows to tune the antenna to the designed frequency, independently of the selected ground point in the vehicle. With the present invention a bigger grade of freedom is possible to design the antenna.
  • the antenna assembly of the invention has been represented in figure 1(b) , wherein it can be observed that the system comprises an integrated antenna (A), a wire or conductor (B), a not-shielded coaxial cable (C) and a ground connection (E).
  • A integrated antenna
  • B wire or conductor
  • C not-shielded coaxial cable
  • E ground connection
  • the antenna (A) can be printed on a robust electrical substrate or dielectric support to ensure the correct position and viability of the antenna within a component of the vehicle.
  • the antenna can be printed directly on the glass of the window of a motor vehicle.
  • the integrated antenna is optimized to receive the signals at the correct band, and it is designed to have good efficiency and the adequate impedance to match the antenna to 50 Ohms or the impedance of the band operation at the desired frequency.
  • a simple wire or conductor (B) is connected between the integrated antenna (A) and an end of the feeder conductor (1) of a coaxial cable (C) by means of a coaxial connector (D).
  • the length (length 1) of the conductor (B) is selected to match the antenna to the correct frequency band operation.
  • this conductor (B) can be represented as an inductor (L1) at the input of the antenna, as represented schematically in figure 1(b) .
  • the conductor (B) increase the antenna's efficiency, opposite than if an inductor is connected directly at the antenna's input, because in this situation the antenna's efficiency doesn't change.
  • this stage has an inductive effect at the antenna's input.
  • This inductive effect could be selected adequately to improve the antenna's resonant frequency and bandwidth, therefore, the antenna's gain.
  • the antenna isn't optimized at the band operation with the adequately impedance, antenna's efficiency and antenna's gain.
  • the antenna system further comprises a not-shielded coaxial wire (C).
  • coaxials useful for this function are: RG-58, RG-316. They could be designed for 50 , 75 Ohms or the specific impedance of the band operation indistinctly.
  • the shielding conductor is a tubular-shaped conductor and the feeder conductor is axially housed within the shielding conductor, both having similar length.
  • the feeder conductor is spaced-apart a certain distance from the shielding conductor be means of a dielectric sleeve (3).
  • the electrical model of the coaxial cable (C ) is a combination between an inductor (L2) and a capacitor (C ) connected to ground as shown in figure 1(b) .
  • the inductor effect is generated by the conductor (B) and the capacitor is generated by the coupled effect between the feeder conductor (1) and the shielding conductor (2) of the coaxial connected to ground. It could be said that the coaxial cable (C ) is a practical LC designed to optimize the antenna's impedance, therefore its VSWR and gain.
  • the shielding conductor (2) is connected to ground at a second end by means of a ground connection (E), which is the point where the connection to the car's ground is done.
  • a ground connection (E)
  • a metallic ring is useful, and is a correct way to ensure the perfect electrical connection between the ground part of the coaxial and the metallic car's structure.
  • a shielded coaxial is connected which provides the connection between the antenna and the radio's input.
  • the feeder conductor (1) of the coaxial cable (C ) is connected to the conductor (B) by means of a not-shielded coaxial connection (D), which is the point where the wire take a connection with a RF coaxial cable to the ground in the car.
  • D not-shielded coaxial connection
  • a Fakra coaxial connector is used to connect the conductor (B) to the coaxial (C). Therefore, a not shielded connection has been done because there is a track were the ground of the coaxial isn't directly connected to the car.
  • the advantage of this solution is that you get the reference of the car's ground in this point but you don't have a physical connection with it. In this way you get another conductor which is acting as a parasite element to the feeding line without shielding the second track of the connection's route.
  • This situation is useful in the way of getting a LC model between the antenna and the car's ground. This LC achieves to optimize the antenna's bandwidth and return losses to improve the quality of the reception at the antenna's output.
  • the conductor (B) is implemented by the same feeder conductor (1) which extends out of the shielding conductor. Obviously, in this embodiment the coaxial connection (D) is not necessary.
  • the end of the shielding conductor closer to the conductor (B) is open, and the second end of the shielding conductor is connected to a ground connection (E).
  • a conventional shielded coaxial cable is used to connect the antenna matching system to a radio's input.
  • the antenna matching system of the invention improve the antenna's bandwidth and efficiency. Additionally, an important saving of cost in SMD electronic components is obtained, because the components of a matching network are implemented by the conductor (B) and the non-shielded coaxial (C).
  • this solution is useful to optimize the antenna's reception when the antenna is connected to an active system as an amplifier or a diversity module.
  • this sort of connection can avoid the highest inductive effect between the radiant element and the ground point of connection.
  • the antenna is not connected by the unshielded coaxial ( figure 6(b) , the antenna's impedance is in the band of operation, therefore the antenna is optimized for the band of operation and its bandwidth is broader.
  • the length of this coaxial has an inductive effect, useful to compensate (cancel) the capacitive component of the antenna's reactance. Adding the two effects simultaneously it's possible to generate a loop around the desired 50 Ohms in the Smith Chart, therefore, increasing the bandwidth. These effects have been represented in figure 7(b) , and the results of improved bandwidth can be observed in figure 6(a) .
  • the antenna is designed to cover the most important broadcast services:

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  • Details Of Aerials (AREA)

Claims (7)

  1. Antenne composant un système adaptateur d'impédance pour véhicules automobiles comprenant un élément d'antenne (A), un fil d'armature (B) et un câble coaxial (C) ayant un conducteur d'alimentation (1) et un conducteur de blindage (2),
    dans lequel
    - le fil d'armature (B) est connecté entre l'élément d'antenne (A) et la première extrémité du conducteur d'alimentation (1),
    - une première extrémité du conducteur de blindage (2) à proximité de la première extrémité du conducteur d'alimentation (1) est ouverte de sorte que le câble coaxial n'est pas protégé,
    - le conducteur de blindage (2) a un point de connexion (E) à une distance sélectionnée de la première extrémité, le point de connexion (E) étant connecté à un point de connexion de la masse du véhicule,
    - la longueur du fil (B) est sélectionnée pour produire un effet inductif qui annule pratiquement le composant capacitif de l'antenne dans la bande utile,
    - le conducteur d'alimentation (1) est espacé du conducteur de blindage (2),
    antenne caractérisée en ce que
    la distance entre le conducteur d'alimentation et le conducteur de blindage est sélectionné pour produire un effet capacitif de masse, qui annule substantiellement la composante d'inductance de la réactance de l'antenne dans la bande utile, ce qui augmente la largeur de bande de l'antenne.
  2. Antenne selon la revendication 1,
    caractérisée en ce que
    le fil est une partie non protégée du conducteur d'alimentation (1).
  3. Antenne selon l'une des revendications précédentes,
    caractérisée en ce que
    la seconde extrémité du conducteur de blindage est connectée à une borne électrique (E) pour sa connexion électrique au véhicule.
  4. Antenne selon l'une des revendications précédentes,
    dans laquelle
    l'élément d'antenne est adapté à la réception d'au moins un service de communication sélectionné dans le groupe suivant :
    AM, MW, FM, GSM900, GSM 1800, GPS, DAB, DTB, PC 1900, KPCS, CDMA, WCDMA, TDMA, UMTS, TACS, ETACS, SDARS, WiFi, WiMAX, UWB, Bluetooth, ZigBee.
  5. Antenne selon la revendication 1,
    caractérisée en ce que
    le fil (B) est connecté au câble coaxial (C) à l'aide d'un connecteur Fakra (D).
  6. Antenne selon l'une des revendications précédentes,
    caractérisée en ce que
    l'élément d'antenne (A) est une antenne intégrée.
  7. Véhicule à moteur comprenant, une antenne avec système adaptateur d'impédance selon l'une des revendications précédentes, et
    un appareil électronique sélectionné dans le groupe comprenant, un amplificateur radio à haute fréquence ou un module diversité haute fréquence, équipement dans lequel, la seconde extrémité du conducteur de blindage (2) est connectée à la masse électrique du véhicule et le véhicule automobile comprend en plus un câble coaxial blindé connecté entre le câble coaxial (C) et l'équipement radio.
EP20070113394 2007-07-30 2007-07-30 Antenne avec système de correspondance d'impédance pour véhicules automobiles Active EP2026473B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES07113394T ES2352049T3 (es) 2007-07-30 2007-07-30 Sistema de adaptación para la antena para vehículos automóviles.
DE200760010135 DE602007010135D1 (de) 2007-07-30 2007-07-30 Antenne mit Impedanzanpassungssystem für Kraftfahrzeuge
EP20070113394 EP2026473B1 (fr) 2007-07-30 2007-07-30 Antenne avec système de correspondance d'impédance pour véhicules automobiles
PCT/EP2008/059634 WO2009016076A1 (fr) 2007-07-30 2008-07-23 Système d'adaptation d'antenne pour des véhicules à moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070113394 EP2026473B1 (fr) 2007-07-30 2007-07-30 Antenne avec système de correspondance d'impédance pour véhicules automobiles

Publications (2)

Publication Number Publication Date
EP2026473A1 EP2026473A1 (fr) 2009-02-18
EP2026473B1 true EP2026473B1 (fr) 2010-10-27

Family

ID=38588937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070113394 Active EP2026473B1 (fr) 2007-07-30 2007-07-30 Antenne avec système de correspondance d'impédance pour véhicules automobiles

Country Status (4)

Country Link
EP (1) EP2026473B1 (fr)
DE (1) DE602007010135D1 (fr)
ES (1) ES2352049T3 (fr)
WO (1) WO2009016076A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN214542538U (zh) * 2018-04-26 2021-10-29 株式会社友华 匹配电路以及天线装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5739602A (en) * 1980-08-22 1982-03-04 Harada Kogyo Kk Antenna for car
JPS6298804A (ja) * 1985-10-24 1987-05-08 Harada Kogyo Kk 広帯域極超短波アンテナ
US4975713A (en) * 1988-04-11 1990-12-04 Modublox & Co., Inc. Mobile mesh antenna
GB9612826D0 (en) * 1996-06-19 1996-08-21 Ford Motor Co Improved vehicular radio antennas
US5982338A (en) * 1997-12-08 1999-11-09 Raytheon Company Rectangular coaxial line to microstrip line matching transition and antenna subarray including the same
US20030176104A1 (en) 2002-03-13 2003-09-18 Hall John W. Apparatus and method for electrical connector cable retention
GB0321625D0 (en) * 2003-09-15 2003-10-15 Harada Ind Europ Ltd Integrated antenna with coupled ground
DE20319069U1 (de) * 2003-12-09 2004-04-01 Schäfer, Jürgen Kleine elektrische Loop-Antenne

Also Published As

Publication number Publication date
DE602007010135D1 (de) 2010-12-09
EP2026473A1 (fr) 2009-02-18
ES2352049T3 (es) 2011-02-15
WO2009016076A1 (fr) 2009-02-05

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