EP0411963A2 - Antenne de vitre - Google Patents

Antenne de vitre Download PDF

Info

Publication number
EP0411963A2
EP0411963A2 EP90308579A EP90308579A EP0411963A2 EP 0411963 A2 EP0411963 A2 EP 0411963A2 EP 90308579 A EP90308579 A EP 90308579A EP 90308579 A EP90308579 A EP 90308579A EP 0411963 A2 EP0411963 A2 EP 0411963A2
Authority
EP
European Patent Office
Prior art keywords
antenna
conductor
heater wires
window glass
feed terminal
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
EP90308579A
Other languages
German (de)
English (en)
Other versions
EP0411963A3 (en
EP0411963B1 (fr
Inventor
Harunori Nippon Sheet Glass Co. Ltd. Murakami
Hidetoshi Nippon Sheet Glass Co. Ltd. Oka
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 EP0411963A2 publication Critical patent/EP0411963A2/fr
Publication of EP0411963A3 publication Critical patent/EP0411963A3/en
Application granted granted Critical
Publication of EP0411963B1 publication Critical patent/EP0411963B1/fr
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

  • the present invention relates to a glass window antenna for a motor vehicle, wherein antenna conductors are arranged on a surface of a window glass used as an insulator.
  • a diversity reception using a plurality of antennas is employed for reducing changes in reception gain according to traveling direction of the vehicle.
  • An FM broadcast diversity reception for example, a pole antenna attached on the body of the motor vehicle and an antenna comprising an antenna conductor attached on a rear glass window are used in a prior art.
  • a space diversity reception is so performed that the highest level one in reception signals is selected (cf. Japanese laid open patent application No. 140301/1988).
  • the pole antenna tuning adjustment is possible only with regard to its length. It is less flexible in arrangements of conductor than that of a glass window antenna. It is therefore difficult to tune conductor for providing complementary directivity for diversity reception system.
  • An element of the pole antenna is arranged vertical­ly so that it shows a low reception sensibility to receive horizontally polarized wave.
  • window glass antennas which have good complimentary directivities and high reception sensibilities without using preamplifiers.
  • a window glass antenna of a motor vehicle comprising heater wires formed in a heating area on a window glass of the motor vehicle; a first antenna conduc­tor formed in a lower blank area outside the heating area; a second antenna conductor formed in a lower blank area out­side the heating area and RF-coupled to the heater wires; and first and second feed terminals arranged oppositely at both lateral sides of the window glass for deriving recep­tion signals from the first and second antenna conductors.
  • location of the first and second antenna conductors is asymmetrical with respect to a center line of glass window. Directivities of the antenna conductors com­plement with each other. Non-directional reception charac­teristic is thus achieved by diversity reception.
  • Fig. 1 is shows a rear glass window 1 of a motor vehicle according to this invention.
  • a plurality of defogging heater wires 2 is formed in parallel to each other through a printing and a baking processes.
  • the heater wires 2 are divided into upper and lower groups.
  • Power is fed through bus bars 3 and 4 through a return path via a common bus bar 5.
  • Another power feed system may be arranged in which heater wires 2 are not divided into two groups so that a current flows from a side bus bar to another side bus bar.
  • the heater wires 2 are used as an AM radio wave reception antenna.
  • Magnetically coupled choke coils 8a and 8b are inserted into power supply lines 7a and 7b.
  • the choke coils provides the heater wires 2 with large impedance to ground in radio frequencies.
  • the power supply line 7a is coupled to a main power supply through a switch 6 and the power supply line 7b is coupled to ground.
  • Antenna conductors 10 and 11 are arranged on upper and lower blank areas of the window glass 1.
  • the upper antenna conductor 10 is exclusively used for FM broadcast reception.
  • the lower antenna conductor 11 is used both for AM and FM broadcast receptions.
  • a diversity reception is per­ formed for FM broadcast reception with using the upper and lower antenna conductors 10 and 11.
  • Asymmetrical arrangement of conductors is employed with respect to the center line of the glass window for satisfactory FM diversity reception.
  • a feed terminal 10a of the upper antenna conductor 10 is located at the right side (viewed from inside of a car) of the glass window 1 and a feed terminal 11a of the lower antenna conductor 11 is located at left side.
  • the antenna conductor 10 comprises horizontal ele­ments 10b - 10g.
  • a main element 10b is a single element antenna of about 800 mm in length and is symmetrically arranged with respect to the center line of the glass window 1.
  • a vertical coupling conductor 10h is connected to form an antenna of generally inverse letter-T configuration.
  • the coupling conductor 10h is connected to a feeder conductor 10i arranged along an upper edge of the glass window 1.
  • An end of the feeder conductor 10i is connected to the feed terminal 10a located at the side end of the glass window 1.
  • the feeder conductor 10i is 3 mm in width and made wider than other conductors so that impedance matching is satisfied between a feeder cable of 50 ⁇ to be connected to the feed terminal 10a and the inverse T-antenna comprising the main element 10b and the coupling conductor 10h.
  • the feeder conductor 10i has a desired capacitance to ground which is produced by capacitive coupling to a window frame (ground potential) near the upper edge of the glass window.
  • a desired impedance measured at the feed terminal 10a is ob­tained.
  • Horizontal elements 10d and 10f are extended from the bus bar 3 of the heater wires 2 in parallel with the main element 10b. These horizontal elements are capacitively coupled with the main element 10b so as to tune the antenna in directivity. Respective ends of the horizontal elements 10d and 10f are located at 300 mm and 400 mm away from the center line of the window 1.
  • a short-circuiting conductor 10j of 4 mm in width is provided along the center line of the glass window 1 to short-circuit all of upper half of the heater wires 2.
  • a horizontal element 10g is extended from an end of the short-circuit conductor 10j toward the bus bar 3 so as to couple capacitively with the element 10h for improving directivity.
  • An end of the horizontal element 10g is located at 500 mm away from the center line of the glass window 1.
  • the short-circuit conductor 10j connects equipotential points of the heater wires 2 so that no short-circuiting current actually flows through the short-circuit conductor 10j.
  • line intervals 10d - 10b, 10b - 10f, 10f - 10g and 10g - heater wires 2 are respectively 10, 15, 7.5 and 7.5 mm.
  • a horizontal auxiliary element 10e of 165 mm in length is extended from the feed terminal 10a so as to tune the antenna in directivity as well as high frequency charac­ teristic.
  • the above-mentioned elements 10d, 10h, 10g and 10e improve reception directivity of the main element 10b on the left side thereof. These elements are arranged generally on the right side of the center line of the glass window 1.
  • the antenna conductor 10 is thus arranged asymmetrically in general with respect to the center line of the glass window 1.
  • the lower antenna conductor 11 has a horizontal main element 11b extended from the feed terminal 11a in parallel with the heater wires 2 at an interval of 2 mm.
  • the main element 10b is capacitively coupled to the heater wires 2 to serve as an antenna used both in receptions of AM and FM waves induced on the heater wires 2.
  • the lower half of the heater wires 2 serves as ground circuitry e.g. a return path of a heater current so that noises in a heater power supply do not propagate directly from the heater wires 2 to the main element 11b. No remarkable noises are recognized in a reception signal.
  • An end of the main element 11b is locat­ed at 210 mm away from the center line of the glass window 1.
  • Auxiliary horizontal elements 11c, 11d and 11e are extended from bus bars 3 and 5 of the heater wires 2 for improving directivity and frequency characteristics of the main element 11b.
  • the heater wires 2 are thus tuned as an antenna.
  • the element 11c is extended horizontally from the lower end of the common bus bar 5 by 150 mm away from the center line of the glass window with an interval of 30 mm to the heater wires 2.
  • the element 11d is extended from the lower end of the bus bar 3 along the right side of the glass window 1 and then extended horizontally to a position 410 mm away from the center line of the glass window 1 with an interval of 15 mm to the heater wires 2.
  • the element 11e is extended from the upper end of the common bus bar 5 along a corner portion and upper side of the glass window 1 to a position 150 mm away from the center line.
  • Fig. 2 shows directivity of antenna conductors 10 and 11 with respect to FM broadcast wave of 95 MHz.
  • the directivity of dotted line D11 corresponds to the antenna conductor 10 and the directivity of a solid line D10 corre­sponds to the antenna conductor 11.
  • a dip in gain of the lower antenna 11 appearing on the right side of a traveling course of a car is complemented by a gain of the upper antenna conductor 10.
  • a dip ap­pearing on the left side of a traveling course of a car is complemented by a gain of the lower antenna conductor 11.
  • a diversity reception is achieved by selecting a higher level one of reception signals from the complementary antenna conductors 10 and 11 in response to comparison of these signals.
  • a stable reception signal is obtained regardless of changes of traveling direction of the car.
  • the lower antenna conductor 11 functions as an AM reception antenna.
  • the heater wires 2 is operable as an antenna conductor since conductors of the wires are relatively long.
  • Fig. 3 is a graph showing a relation between AM reception sensibility and coupling capacitance of the main antenna element 11 to the heater wires 2. Differences in sensibility are plotted with reference to that (0dB) of a rear pole antenna of 1200 mm long. The difference reaches the reference when the coupling capacitance exceeds 60 pF, and saturates at 70 pF or more.
  • the main element 11b and the heater wires 2 are set at an interval of 2 mm to give capacitive coupling not less than 70 pF so that an AM reception signal is obtained by the antenna conductor 11 with a sufficient gain.
  • Fig. 4 shows reception gains of the upper antenna conductor 10 in FM broadcast wave ranging 80 - 90 MHz in cases where width of the feeder conductor 10i in Fig. 1 is 1 mm and 3 mm as respectively shown by a dotted line and a solid line.
  • reception gains in lower side and upper side of FM broadcast band are re­spectively improved when the width of the feeder conductor 10i is set more than 3 mm. Frequency characteristics are improved over a wide range.
  • the feeder conductor 10i is extended from the center line of the window glass 1 toward right side to the feed terminal 10a and operates as an antenna element which serves to improve reception gain on the right side of traveling course.
  • Fig. 5 shows reception gains of the lower antenna conductor 11 in a range 80 - 90 MHz in cases where the horizontal elements 11c and 11e are extended from the common bus 5 of the heater wires 2 and these elements 11c and 11e are removed, respectively as shown by a solid line A and a dotted line B .
  • a condition of FM radio wave current induced on the heater wires 2 is changed by extending the elements 11c and 11e from the common bus bar 5 of the heater wires 2, frequency bands each in which a good sensibility is obtained are shifted to each other as shown by the graph.
  • These elements 11c and 11e are arranged on the left side of the glass window 1 so that it operates to improve reception gain of the lower antenna conductor 11 on the left side of the traveling course.
  • Fig. 6 shows gain characteristics in a band of 80 - 110 MHz for a case (solid line A ) where the short-­circuiting conductor 10j is provided to the heater wires 2 in Fig. 1 and the horizontal element 10g is extended from an end of the conductor 10j in parallel to the heater wires 2, and another case (dotted line B ) where these conductors 10j and 10g are not used.
  • State of FM radio frequency current induced on the heater wires 2 is changed by attaching these conductors 10j and 10g. Frequency band having good sensibil­ity can be shifted as shown by the graph.
  • the horizontal elements 10g is extended on the left side of the glass window 1 so that it operates to improve reception gain of the upper antenna conductor 10 on the left side of the traveling course.
  • Fig. 7 shows reception gains in a band of 80 - 110 MHz in a case (solid line A ) where the horizontal elements 10d and 10f are extended from the bus bar 3 of the heater wires 2 as shown in Fig. 1 to capacitively couple with the main element 10b on both sides (upper and lower sides) thereof and another case (dotted line B ) where the elements 10d and 10f are not used. Influence to the main element 10b by the heater wires 2 can be changed by capacitive coupling of horizontal elements 10d and 10f with the main element 10b at a distance within 15 mm. Frequency band having good sensibility can be shifted as shown by the graph. These horizontal elements 10d and 10f operate to improve a gain of the upper antenna conductor 10 on the right side of a trav­eling course.
  • the first and second antenna conductors due to asymmetrical arrangement of the first and second antenna conductors with respect to the center of the glass window, directivities complementing to each other are obtained. Good reception characteristics are obtained with diversity reception re­gardless of traveling direction of car.
  • a recep­tion system in which any preamplifier is not employed can be arranged so that a reception signal of high quality is received without distortion even in a strong radio wave field.
  • reception gains of the first and second antenna conductors are improved.
  • Complementary characteristics of the first and second antenna elements are ensured to operate a diversity reception system with high performance.

Landscapes

  • Details Of Aerials (AREA)
EP90308579A 1989-08-03 1990-08-03 Antenne de vitre Expired - Lifetime EP0411963B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP202008/89 1989-08-03
JP1202008A JP2515158B2 (ja) 1989-08-03 1989-08-03 自動車用窓ガラスアンテナ

Publications (3)

Publication Number Publication Date
EP0411963A2 true EP0411963A2 (fr) 1991-02-06
EP0411963A3 EP0411963A3 (en) 1991-05-08
EP0411963B1 EP0411963B1 (fr) 1995-06-21

Family

ID=16450396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90308579A Expired - Lifetime EP0411963B1 (fr) 1989-08-03 1990-08-03 Antenne de vitre

Country Status (7)

Country Link
EP (1) EP0411963B1 (fr)
JP (1) JP2515158B2 (fr)
AU (1) AU636157B2 (fr)
CA (1) CA2022953C (fr)
DE (1) DE69020256T2 (fr)
ES (1) ES2073534T3 (fr)
ZA (1) ZA905864B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588514A1 (fr) * 1992-09-15 1994-03-23 Ford Motor Company Antenne hybride monopole/logarithmique périodique
EP0591957A2 (fr) * 1992-10-06 1994-04-13 Central Glass Company, Limited Antenne de vitre pour voiture automobile
DE4323239A1 (de) * 1993-07-12 1995-01-19 Kolbe & Co Hans Kraftfahrzeug-Scheibenantenne
EP0661772A1 (fr) * 1993-12-28 1995-07-05 Mazda Motor Corporation Antenne de vitre et procédé pour sa conception
US6002373A (en) * 1996-06-20 1999-12-14 Mazda Motor Corporation Glass window antenna
WO2005060044A1 (fr) * 2003-12-17 2005-06-30 Robert Bosch Gmbh Antenne a disque pour vehicule
WO2009068350A1 (fr) * 2007-11-30 2009-06-04 Robert Bosch Gmbh Système d'antenne, et procédé correspondant
EP2323221A1 (fr) * 2008-09-12 2011-05-18 Central Glass Company, Limited Antenne de pare-brise
US11223129B2 (en) 2016-05-12 2022-01-11 Pilkington Group Limited Connector for antennas, a glazing comprising the connector and an antenna system comprising the connector

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4324037B2 (ja) 2004-07-02 2009-09-02 トヨタ自動車株式会社 車両用内装材構造
JP6459650B2 (ja) * 2015-03-09 2019-01-30 セントラル硝子株式会社 自動車用ガラスアンテナ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5642401A (en) * 1979-09-13 1981-04-20 Nippon Sheet Glass Co Ltd Heating plate glass for antenna extension
JPS5870647A (ja) * 1981-10-22 1983-04-27 Toyota Motor Corp 自動車用受信装置
JPS5870644A (ja) * 1981-10-22 1983-04-27 Toyota Motor Corp 自動車用受信装置
US4439771A (en) * 1981-05-15 1984-03-27 Asahi Glass Company, Ltd. Glass antenna system for an automobile
JPS6329307U (fr) * 1986-08-06 1988-02-26
JPS63138408U (fr) * 1987-03-03 1988-09-12
JPS63269625A (ja) * 1987-04-27 1988-11-07 Mazda Motor Corp 自動車のアンテナ装置
DE3921413A1 (de) * 1988-08-24 1990-03-01 Pioneer Electronic Corp Scheibenantenne fuer ein fahrzeug

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52147622A (en) * 1976-06-03 1977-12-08 Toyota Motor Co Ltd Window glass having defogger hot wire for vehicles
CA1118621A (fr) * 1979-11-01 1982-02-23 Lawrence C. Smyth Methode et gabarit de fabrication de raccords pour fibres optiques
JPS6033525B2 (ja) * 1981-10-12 1985-08-03 株式会社クボタ 分離装置
JPH066582Y2 (ja) * 1988-03-31 1994-02-16 日本板硝子株式会社 自動車用窓ガラスアンテナ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5642401A (en) * 1979-09-13 1981-04-20 Nippon Sheet Glass Co Ltd Heating plate glass for antenna extension
US4439771A (en) * 1981-05-15 1984-03-27 Asahi Glass Company, Ltd. Glass antenna system for an automobile
JPS5870647A (ja) * 1981-10-22 1983-04-27 Toyota Motor Corp 自動車用受信装置
JPS5870644A (ja) * 1981-10-22 1983-04-27 Toyota Motor Corp 自動車用受信装置
JPS6329307U (fr) * 1986-08-06 1988-02-26
JPS63138408U (fr) * 1987-03-03 1988-09-12
JPS63269625A (ja) * 1987-04-27 1988-11-07 Mazda Motor Corp 自動車のアンテナ装置
DE3921413A1 (de) * 1988-08-24 1990-03-01 Pioneer Electronic Corp Scheibenantenne fuer ein fahrzeug

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 162 (E-187) 15 July 1958, & JP-A-58 070644 (TOYOTA JIDOSHA KOGYO KK) 27 April 1983, *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 99 (E-63)(771) 26 June 1981, & JP-A-56 042401 (NIPPON ITA GLASS K.K) 20 April 1981, *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 162 (E-187)(1307) 15 July 1983, & JP-A-58 070647 (TOYOTA JIDOSHA KOGYO KK) 27 April 1983, *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588514A1 (fr) * 1992-09-15 1994-03-23 Ford Motor Company Antenne hybride monopole/logarithmique périodique
EP0591957A2 (fr) * 1992-10-06 1994-04-13 Central Glass Company, Limited Antenne de vitre pour voiture automobile
EP0591957A3 (fr) * 1992-10-06 1995-06-14 Central Glass Co Ltd Antenne de vitre pour voiture automobile.
US5461391A (en) * 1992-10-06 1995-10-24 Central Glass Company, Limited Automotive window glass antenna
DE4323239A1 (de) * 1993-07-12 1995-01-19 Kolbe & Co Hans Kraftfahrzeug-Scheibenantenne
DE4323239C2 (de) * 1993-07-12 1998-04-09 Fuba Automotive Gmbh Antennenstruktur für eine Kraftfahrzeug-Heckscheibe
CN1053297C (zh) * 1993-12-28 2000-06-07 马自达汽车株式会社 玻璃天线
EP0661772A1 (fr) * 1993-12-28 1995-07-05 Mazda Motor Corporation Antenne de vitre et procédé pour sa conception
US5659324A (en) * 1993-12-28 1997-08-19 Mazda Motor Corporation Glass antenna and method of designing the same
US6002373A (en) * 1996-06-20 1999-12-14 Mazda Motor Corporation Glass window antenna
WO2005060044A1 (fr) * 2003-12-17 2005-06-30 Robert Bosch Gmbh Antenne a disque pour vehicule
US7719475B2 (en) 2003-12-17 2010-05-18 Robert Bosch Gmbh Window-integrated antenna in vehicles
WO2009068350A1 (fr) * 2007-11-30 2009-06-04 Robert Bosch Gmbh Système d'antenne, et procédé correspondant
US8587487B2 (en) 2007-11-30 2013-11-19 Blaupunkt Antenna Systems GmbH & Co. Antenna arrangement and method
EP2323221A1 (fr) * 2008-09-12 2011-05-18 Central Glass Company, Limited Antenne de pare-brise
EP2323221A4 (fr) * 2008-09-12 2011-10-26 Central Glass Co Ltd Antenne de pare-brise
US8692726B2 (en) 2008-09-12 2014-04-08 Central Glass Company Limited. Glass antenna for vehicle
US11223129B2 (en) 2016-05-12 2022-01-11 Pilkington Group Limited Connector for antennas, a glazing comprising the connector and an antenna system comprising the connector

Also Published As

Publication number Publication date
CA2022953A1 (fr) 1991-02-04
JPH0365803A (ja) 1991-03-20
DE69020256T2 (de) 1996-02-08
EP0411963A3 (en) 1991-05-08
DE69020256D1 (de) 1995-07-27
CA2022953C (fr) 1999-09-21
ES2073534T3 (es) 1995-08-16
ZA905864B (en) 1991-05-29
AU5976990A (en) 1991-02-07
JP2515158B2 (ja) 1996-07-10
EP0411963B1 (fr) 1995-06-21
AU636157B2 (en) 1993-04-22

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