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EP0438247B1 - Antenne für ein Kraftfahrzeug - Google Patents

Antenne für ein Kraftfahrzeug Download PDF

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Publication number
EP0438247B1
EP0438247B1 EP19910300238 EP91300238A EP0438247B1 EP 0438247 B1 EP0438247 B1 EP 0438247B1 EP 19910300238 EP19910300238 EP 19910300238 EP 91300238 A EP91300238 A EP 91300238A EP 0438247 B1 EP0438247 B1 EP 0438247B1
Authority
EP
European Patent Office
Prior art keywords
antenna
heater wires
conductor
motor vehicle
antenna conductor
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
EP19910300238
Other languages
English (en)
French (fr)
Other versions
EP0438247A1 (de
Inventor
Kaoru C/O Nippon Sheet Glass Co. Ltd. Sakurai
Hiroshi C/O Nippon Sheet Glass Co. Ltd. Iijima
Kazuhisa C/O Nippon Sheet Glass Co. Ltd. Fujita
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.)
Nippon Sheet Glass Co Ltd
Original Assignee
Nippon Sheet Glass Co Ltd
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 Nippon Sheet Glass Co Ltd filed Critical Nippon Sheet Glass Co Ltd
Publication of EP0438247A1 publication Critical patent/EP0438247A1/de
Application granted granted Critical
Publication of EP0438247B1 publication Critical patent/EP0438247B1/de
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
    • H01Q1/12—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

Definitions

  • defogging heater wires are provided on a rear glass window of a motor car. It is well-known for an antenna conductor for radio or TV reception to be provided above or below the defogging area for the heater wires.
  • the antenna conductor has an advantage in that tuning in directivity and bandwidth or the like can be achieved by forming the conductor pattern freely on the glass window. It is well-known too to use the heater wires as an antenna conductor. Document EP-A-65 263 discloses such a window antenna.
  • the heater wires have a fixed conductor length and a fixed interval between the conductors. It is difficult to change the wiring of the conductors for adjusting effective length which determines bandwidth or for improving directivity. Therefore, a broadcast band which the heater wires can not receive is assigned to the antenna conductor located above or below the area of the heater wires.
  • a space is required for wiring the antenna conductor. In this space, however, fog can not be removed. On the contrary, when defogging area of the heater wires is enlarged, the space for the antenna conductor is reduced resulting in poor tuning.
  • Document EP-A- 382 895 which belongs to the prior art according to Article 54 (3) EPC, i.e. which has been filed before the date of priority of the present application and published after said priority date, discloses an antenna apparatus for motor vehicle comprising defogging heater wires provided on a central heating area on a motor vehicle window, and antenna element arranged in the upper area of the heating area and constituting a closed circuit for passing a heating current therethrough;
  • the upper antenna conductor is tuned up to have a natural frequency which is lower than that of central heating wires.
  • An antenna apparatus comprises defogging heater wires provided on a central heating area on a motor vehicle window; and an antenna element arranged in at least one of upper and lower areas of the heating area; characterised in that said antenna element is tuned to have a natural frequency which is higher than that of said heater wires and constitutes a closed circuit for passing a heating current therethrough.
  • the antenna conductor is used as a heater conductor which forms a closed circuit for passing a heating current therethrough.
  • the antenna conductor is assigned to a reception band located at sufficiently higher frequency than that of the heater wires. Reception characteristics can be improved by tuning the arrangement of the antenna conductor.
  • Fig. 1 shows an example of an arrangement of conductors on a motor vehicle window in an electric system embodying this invention.
  • a plurality of heater wires 2 provided on a rear glass window 1 are divided into upper and lower groups. Power is supplied to bus bars 3a and 3b at respective ends of the groups which are connected at their other ends through an intermediate bus bar 4 so as to form a return path. Power feed lines 5a and 5b are connected to the bus bars 3a and 3b. A heating current passes from a main power source terminal +B to the power feed line 5a through an RF choke coil 6a. The power feed line 5b connected to the bus bar 3b is grounded through a choke coil 6b.
  • the choke coils 6a and 6b are coupled in the demagnetization direction to each other so that a core does not saturates with a large heating current.
  • the impedances of the choke coils 6a and 6b are very large in a radio broadcast band.
  • the impedance to the ground of the heater wires is enhanced so that it can be used as an antenna.
  • a reception signal in the heater wires 2 is transmitted to an AM radio receiver through a coupling capacitor 7a connected to a terminal of the intermediate bus bar 4 and a coaxial cable 7.
  • An upper blank area above the defogging area with the heater wires 2 is provided with an antenna conductor 8 tuned to receive an FM broadcast wave.
  • the antenna conductor is arranged as a laterally extending oblong rectangle.
  • a pair of feed terminals 9a and 9b is provided at the center of longitudinal (horizontal) side along the upper side of the window glass 1.
  • the feed terminal 9a is coupled to a core wire of a coaxial cable 11 through a DC-blocking capacitor 10.
  • the feed terminal 9b is coupled to an outer conductor of the coaxial cable 11.
  • the antenna conductor 8 operates as an unbalanced antenna with one side grounded.
  • An FM reception signal received by the antenna conductor 8 is fed to an FM radio receiver through the coaxial cable 11.
  • the antenna conductor 8 is tuned to have a longer side and shorter side respectively 1600 mm and 30 mm for receiving an FM broadcast wave with high sensitivity.
  • the antenna conductor 8 forms a closed circuit when viewed from the feed terminals 9a and 9b so as to be operated as a defogging heater conductor.
  • a positive power feed line 12b is connected to the feed terminal 9a as a branch from the power feed line 5b.
  • a power feed line 12b as grounded side is connected to the feed terminal 9b as a branch from the power feed line 5b.
  • a heating current passes from the feed terminal 9a to the feed terminal 9b to heat the glass in an area enclosed by the conductor 8 as well as the vicinity thereof for defogging.
  • Fig. 2 shows a modification of a circuit for supplying heating current.
  • a heating current is supplied to the antenna conductor 8 via the choke coils 6a and 6b.
  • a heating current is directly supplied to the heater wires 2 from the power supply without passing through the choke coils 6a and 6b.
  • the choke coils 6a and 6b are set exclusively for an FM band.
  • the inductance of the choke coils must be large, resulting in increase of stray capacitance along with increase in windings. Leaking of signal through the choke coil can not be ignored in an FM band. This problem can be settled when a choke coil exclusively for the FM band is employed.
  • additional choke coils for the AM band can be inserted in the power feed lines 5a and 5b.
  • Fig. 3 shows another example in which the antenna conductor 8 is fed with power at the lateral side (shorter side). Terminals 9a and 9b are provided to supply power thereto and collect reception signal therefrom. Additionally, an auxiliary element 8a is attached to an end opposed to the terminals 9a and 9b to improve reception characteristics of the conductor 8.
  • FIG. 4 A further modification is shown,in Fig. 4 in which the bus bar 3b at the grounded side is extended upward to connect to the feed terminal 9b of the antenna conductor 8 seen in Fig. 3.
  • the power feed line 12b in Fig. 3 is not employed.
  • Fig. 5 shows another modification in which a plurality of horizontal parallel conductors 8b,8c,8d,8e is provided in the antenna conductor 8.
  • the number of horizontal conductors may be adjusted to tune the antenna.
  • a closed circuit for heating is formed by parallel connection of the conductors.
  • the antenna conductor 8 may be located in the lower blank area below the defogging area with heater wires 2.
  • the antenna conductor located outside the defogging area is used as a heating conductor which constitutes a closed circuit for a heating current and is tuned to have a natural frequency that is higher than that of the heating wires in the defogging area.
  • the defogging area can be enlarged to ensure a rear view without degrading the antenna characteristic in the high frequency range.

Landscapes

  • Details Of Aerials (AREA)

Claims (1)

  1. Antenne für ein Kraftfahrzeug, mit Entnebelungs-Heizdrähten in einem zentralen Heizbereich eines Kraftfahrzeugfensters, sowie mit einem Antennenelement wenigstens in einem oberen oder unteren Bereich des Heizbereichs, dadurch gekennzeichnet, daß das Antennenelement so abgestimmt ist, daß seine Eigenfrequenz höher liegt als die der Heizdrähte, und ferner als geschlossene und den Durchfluß eines Heizstroms erlaubende Schaltung ausgebildet ist.
EP19910300238 1990-01-16 1991-01-14 Antenne für ein Kraftfahrzeug Expired - Lifetime EP0438247B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2506/90 1990-01-16
JP1990002506U JPH0756495Y2 (ja) 1990-01-16 1990-01-16 自動車窓用アンテナ装置

Publications (2)

Publication Number Publication Date
EP0438247A1 EP0438247A1 (de) 1991-07-24
EP0438247B1 true EP0438247B1 (de) 1994-12-21

Family

ID=31506379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910300238 Expired - Lifetime EP0438247B1 (de) 1990-01-16 1991-01-14 Antenne für ein Kraftfahrzeug

Country Status (4)

Country Link
EP (1) EP0438247B1 (de)
JP (1) JPH0756495Y2 (de)
DE (1) DE69106005T2 (de)
ES (1) ES2065614T3 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3613097B2 (ja) * 1999-11-10 2005-01-26 日本板硝子株式会社 車両用ガラスアンテナ
DE10350780A1 (de) * 2003-10-30 2005-06-02 Robert Bosch Gmbh Fahrzeugscheibenantenne
US8022883B2 (en) * 2008-12-17 2011-09-20 Mitsumi Electric Co., Ltd. AM/FM windowpane antenna pattern structure wherein feeding point is disposed thereinside

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2258015A1 (en) * 1974-10-01 1975-08-08 Organ Ewart Antenna and heating element for motor vehicles - has chokes and capacitors separating HF signal and DC heating current
JPS57188102A (en) * 1981-05-15 1982-11-19 Asahi Glass Co Ltd Glass antenna for automobile
JPS63131216U (de) * 1987-02-12 1988-08-26
DE3904490A1 (de) * 1989-02-15 1990-08-16 Bosch Gmbh Robert Fahrzeug-scheibenantenne

Also Published As

Publication number Publication date
JPH0756495Y2 (ja) 1995-12-25
ES2065614T3 (es) 1995-02-16
DE69106005D1 (de) 1995-02-02
DE69106005T2 (de) 1995-07-13
JPH0394813U (de) 1991-09-27
EP0438247A1 (de) 1991-07-24

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