EP0504525B1 - Window glass antenna for automobiles - Google Patents

Window glass antenna for automobiles Download PDF

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Publication number
EP0504525B1
EP0504525B1 EP19910310275 EP91310275A EP0504525B1 EP 0504525 B1 EP0504525 B1 EP 0504525B1 EP 19910310275 EP19910310275 EP 19910310275 EP 91310275 A EP91310275 A EP 91310275A EP 0504525 B1 EP0504525 B1 EP 0504525B1
Authority
EP
European Patent Office
Prior art keywords
window glass
patterns
glass antenna
receiving antenna
pattern
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
EP19910310275
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0504525A1 (en
Inventor
Hitoshi Nippon Sheet Glass Co. Ltd. Kakizawa
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
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Application filed by Nippon Sheet Glass Co Ltd filed Critical Nippon Sheet Glass Co Ltd
Publication of EP0504525A1 publication Critical patent/EP0504525A1/en
Application granted granted Critical
Publication of EP0504525B1 publication Critical patent/EP0504525B1/en
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

Definitions

  • the present invention relates to a radio signal receiving antenna comprising an electric conductor attached to a sheet of window glass of an automobile.
  • FIG. 4 of the accompanying drawings schematically shows a known window glass antenna for automobiles as disclosed in Japanese Laid-Open Utility Model Publication No. 1-146614 published on October 9, 1989.
  • the conventional window glass antenna generally designated by the reference numeral 101 in FIG. 4, comprises a plurality of loop-shaped receiving antenna patterns 103a, 103b, 103c attached to a sheet of window glass 102 and spaced inwardly from the outer peripheral edge thereof.
  • the receiving antenna patterns 103a, 103b, 103c have ends connected to each other by a connector 104 that serves to pick up received radio signals.
  • the other ends of the receiving antenna patterns 103a, 103b, 103c are spaced from the connector 104 by a gap 105.
  • the receiving antenna patterns 103a, 103b are interrupted by respective gaps 107, 106 defined therein, so that the receiving antenna patterns 103a, 103b have different effective lengths.
  • the loop-shaped receiving antenna patterns 103a, 103b, 103c are disposed within a limited surface area of the window glass 102. Therefore, it is difficult to increase the effective length of the window glass antenna 101. While the known window glass antenna 101 is highly sensitive to frequency-modulated (FM) broadcasts transmitted in an ultrashort wave range having frequencies ranging from 70 MHz to 110 MHz), its sensitivity is not high enough to receive amplitude-modulated (AM) broadcasts transmitted in a medium wave range with a frequency range from 500 kHz to 1.6 MHz.
  • FM frequency-modulated
  • AM amplitude-modulated
  • a window glass antenna comprising a plurality of receiving antenna patterns disposed on a sheet of window glass, and an end connector pattern connecting ends of the receiving antenna patterns, wherein the window glass antenna further comprises an auxiliary pattern disposed near free ends of the receiving antenna patterns and extending parallel to the end connector. pattern, the auxiliary pattern having an end connected to the end connector pattern.
  • a window glass antenna for use on an automobile according to the present invention generally comprises 37 receiving antenna patterns A (A1 through A37) attached to a sheet of window glass 2, an end connector pattern B, an auxiliary pattern C, and a radio signal pickup area D.
  • the patterns A, B, C and the radio signal pickup area D may be formed of a printed and baked paste material that is electrically conductive.
  • the receiving antenna patterns A1 through A37 extend in straight lines parallel to each other, and each serve to receive radio signals in the FM broadcast band. Some of the receiving antenna patterns A1 through A37 have different lengths.
  • the following table specifically shows the lengths of the receiving antenna patterns A1 through A37: Table (lengths in mm) Pattern No. Length Pattern No.
  • the lengths of the receiving antenna patterns A1 through A37 are selected to receive broadcasts in the entire FM broadcast band with high sensitivity.
  • the receiving antenna patterns A1 through A37 are spaced apart by a pitch or spacing P of at most about 30 mm, preferably about 20 mm.
  • the receiving antenna patterns A1 through A37 have ends connected to the end connector pattern B for receiving radio signals in the AM broadcast band.
  • the end connector pattern B has one end joined to the radio signal pickup area D.
  • the end connector pattern B is straight and runs transversely to the direction of the receiving antenna patterns A adjacent one edge, preferably the lower edge, of the window glass 2.
  • the receiving antenna patterns A all terminate at one end on the straight end connector pattern and all extend in the same direction away therefrom towards their free ends.
  • the auxiliary pattern C which serves as an impedance adjusting element, is disposed near the free ends of the receiving antenna patterns A and extends parallel to the end connector pattern B.
  • One end of the auxiliary pattern C is connected to the radio signal pickup area D by an auxiliary pattern connector CA disposed on one side of the receiving antenna patterns A.
  • the end connector pattern B has a length of 766 mm
  • the auxiliary pattern C has a length of 725 mm
  • the auxiliary pattern connector CA has a length of 375 mm.
  • FIG. 2 shows the relationship between the pitch or distance P between adjacent ones of the receiving antenna patterns A1 through A37 and the sensitivity with which the window glass antenna 1 receives the AM broadcast band.
  • the graph of FIG. 2 has a horizontal axis representing the pitch P, and a vertical axis representing the radio signal reception sensitivity S (dB ⁇ V). The measurements were conducted in an electric field of 60 dB ⁇ V/m at a frequency of 1 MHz.
  • the radio signal reception sensitivity S of the window glass antenna 1 increases as the pitch P decreases from 80 mm to 30 mm, but does not increase substantially as the pitch P is reduced to less than 30 mm. If the pitch P of the receiving antenna patterns A1 through A37 were reduced below 10 mm, then the visibility of the window glass 2 would be impaired.
  • FIG. 3 shows the relationship between the frequency of the FM broadcast band and the reception sensitivity of window glass antennas.
  • the graph of FIG. 3 has a horizontal axis representing the frequency f of the FM broadcast band, and a vertical axis representing the radio signal reception sensitivity S (dB ⁇ V).
  • the curve C1 in FIG. 3 indicates the frequency vs. sensitivity characteristics of the window glass antenna 1 according to the present invention, the curve C2 the frequency vs. sensitivity characteristics of a window glass antenna that is similar to the window glass antenna 1 except that the auxiliary pattern C is dispensed with, and the curve C111 the frequency vs. sensitivity characteristics of a comparative antenna (not shown).
  • the comparative antenna had 37 receiving antenna patterns having the same length of 375 mm and spaced at a pitch P of 20 mm.
  • the comparative antenna 37 had no auxiliary pattern.
  • the measurements were conducted in an electric field of 60 dB ⁇ V/m.
  • the auxiliary pattern C is effective to prevent a sensitivity reduction in a middle frequency range from 94 MHz to 102 MHz of the FM broadcast band, resulting in reduced reception sensitivity variations over the entire FM broadcast band.
  • the pitch P between adjacent ones of the receiving antenna patterns A1 through A37 is selected to be in a range, which is of at most about 30 mm, suitable for receiving radio signals in the AM broadcast band with high sensitivity.
  • the number of receiving antenna patterns is relatively small, and hence the amount of the electrically conductive paste material used as the receiving antenna patterns is relatively small.
  • the lengths of the receiving antenna patterns A1 through A37 are varied such that the frequency vs. sensitivity characteristic curve C1 is as flat as possible over the entire FM broadcast band. Accordingly, the window glass antenna 1 does not have any reception sensitivity peaks for particular frequencies in the FM broadcast band, but has a high reception sensitivity over the entire FM broadcast band.
  • the window glass antenna 1 according to the present invention is capable of receiving radio signals in both AM and FM broadcast bands with high sensitivity.

Landscapes

  • Details Of Aerials (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP19910310275 1990-11-06 1991-11-06 Window glass antenna for automobiles Expired - Lifetime EP0504525B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP116603/90U 1990-11-06
JP1990116603U JP2517718Y2 (ja) 1990-11-06 1990-11-06 窓ガラスアンテナ

Publications (2)

Publication Number Publication Date
EP0504525A1 EP0504525A1 (en) 1992-09-23
EP0504525B1 true EP0504525B1 (en) 1997-01-29

Family

ID=14691250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910310275 Expired - Lifetime EP0504525B1 (en) 1990-11-06 1991-11-06 Window glass antenna for automobiles

Country Status (3)

Country Link
EP (1) EP0504525B1 (enrdf_load_stackoverflow)
JP (1) JP2517718Y2 (enrdf_load_stackoverflow)
DE (1) DE69124502T2 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008096751A1 (ja) * 2007-02-06 2008-08-14 Nippon Sheet Glass Company, Limited 車両用ガラスアンテナ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6911585U (de) * 1969-03-22 1969-12-04 Hirschmann Radiotechnik Kraftfahrzeugantenne mit antennenleitern auf oder in einer fensterscheibe
JPS5148907Y1 (enrdf_load_stackoverflow) * 1970-03-04 1976-11-25
JPS5861507U (ja) * 1981-10-22 1983-04-25 トヨタ自動車株式会社 自動車用ガラスアンテナ
JPS61222302A (ja) * 1984-11-19 1986-10-02 Nippon Sheet Glass Co Ltd 自動車用窓ガラスアンテナ
JPS61197709U (enrdf_load_stackoverflow) * 1985-05-30 1986-12-10
JP3206912B2 (ja) * 1990-07-16 2001-09-10 日本板硝子株式会社 自動車用窓ガラスアンテナ

Also Published As

Publication number Publication date
DE69124502D1 (de) 1997-03-13
JPH0472712U (enrdf_load_stackoverflow) 1992-06-26
DE69124502T2 (de) 1997-05-22
JP2517718Y2 (ja) 1996-11-20
EP0504525A1 (en) 1992-09-23

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