WO2013038784A1 - Système antenne sur vitre - Google Patents

Système antenne sur vitre Download PDF

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Publication number
WO2013038784A1
WO2013038784A1 PCT/JP2012/067183 JP2012067183W WO2013038784A1 WO 2013038784 A1 WO2013038784 A1 WO 2013038784A1 JP 2012067183 W JP2012067183 W JP 2012067183W WO 2013038784 A1 WO2013038784 A1 WO 2013038784A1
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WO
WIPO (PCT)
Prior art keywords
antenna
glass
transmission line
amplifier module
glass surface
Prior art date
Application number
PCT/JP2012/067183
Other languages
English (en)
Japanese (ja)
Inventor
英明 大島
浩輔 田中
Original Assignee
日本板硝子株式会社
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 日本板硝子株式会社 filed Critical 日本板硝子株式会社
Publication of WO2013038784A1 publication Critical patent/WO2013038784A1/fr

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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 particularly relates to a glass antenna system suitable for mounting on a window glass of a vehicle as an antenna for a terrestrial digital television (hereinafter simply referred to as DTV: Digital Television).
  • DTV Digital Television
  • an amplifier module 200 is mounted on a pair of power supply portions (power supply terminals 101) of an antenna pattern 100.
  • DTV antennas are UHF (Ultra High Frequency) band signal waves, and are therefore often used for connection between the antenna and the amplifier module 200.
  • wire single wire
  • the antenna performance becomes unstable due to the routing. For this reason, the performance is stabilized by installing the amplifier module 200 in the vicinity of the antenna on the glass surface and directly connecting to the antenna pattern 100.
  • a glass antenna for a vehicle having at least the above element is known (for example, see Patent Document 1).
  • the ground conductor extends from the end of the connection conductor on the antenna conductor side toward the feed point and extends around the feed point to the end.
  • an automotive glass antenna in which the distance d between the connection conductor and the ground conductor and the conductor width w1 of the connection conductor satisfy the relationship of 0.3 ⁇ w1 / (w1 + 2d) ⁇ 0.95. (For example, refer to Patent Document 2).
  • the amplifier module is installed on the glass surface, which has an aesthetic problem, and an amplifier concealment cover may be necessary. It becomes a factor of up.
  • the antenna can be placed only where the amplifier module can be installed, and as a result, the layout that prioritizes the antenna performance cannot be performed, and it may be difficult to ensure the performance. is there. Even if the amplifier module is moved to the pillar, a coaxial line is required to connect the amplifier module and the antenna. In this case, depending on the layout position of the amplifier module, the length of the coaxial line for connection changes, and the antenna performance May become unstable. In addition, depending on the state of the coaxial line, the antenna performance varies from vehicle type to vehicle type and may become unstable.
  • the antenna pattern itself is restricted because the setting of the antenna shape including the horizontal parallel two lines is limited in order to ensure the predetermined antenna characteristics.
  • the degree of design freedom is small.
  • the glass antenna for a vehicle described in Patent Document 2 since the ground conductor covers the periphery of the connection conductor connected to the antenna at a predetermined interval, the print area of the connection conductor is increased, and the aesthetic appearance is increased. Problems occur.
  • the glass antenna for a vehicle described in Patent Document 2 it is a kind of unbalanced line because the ground conductor covers the periphery of the connection conductor, which is like a balanced antenna that does not use the vehicle body as a ground. If this technique is applied to a simple glass antenna, a problem of discontinuity of the reference potential occurs at the connection portion between the line and the antenna, and as a result, the antenna characteristics become unstable.
  • An object of the present invention is to provide a glass antenna system in which an antenna pattern can be arranged at a position where the antenna performance can be ensured to the maximum without depending on the arrangement position of the amplifier module.
  • a glass antenna system in which an antenna is formed on a glass surface, the antenna element comprising an antenna pattern having a pair of feeding parts printed on the glass surface;
  • An amplifier module installed on the glass surface for amplifying a signal received by the antenna element, and a line width and a distance necessary for matching with the characteristic impedance of the antenna pattern printed on the glass surface
  • a glass antenna comprising: a transmission line composed of two linear conductors, at least a part of which is arranged in parallel, connecting the antenna pattern having the power supply unit and the amplifier module.
  • the constant A is preferably in the range of 115 at the minimum and 160 at the maximum.
  • the constant B is in the range of 20 at the minimum and 30 at the maximum.
  • the characteristic impedance of the transmission line is adjustable in a range of 75 [ ⁇ ] to 200 [ ⁇ ].
  • a line feed and a set of two points having a line width and a spacing necessary for matching with a characteristic impedance of an antenna pattern printed on a glass surface and having a pair of feeds.
  • a transmission line consisting of two linear conductors, at least part of which is arranged in parallel, connecting the antenna pattern having the antenna module and the amplifier module, the amplifier module can be separated from the antenna pattern having a pair of feeding parts. It can be laid out on the glass surface in an independent manner. Therefore, an antenna pattern having a pair of two-point power feeding units can be designed independently without depending on the layout position of the amplifier module, and the degree of design freedom is increased.
  • the antenna pattern can be laid out at a position convenient for securing the antenna performance, and the antenna performance can be improved. Furthermore, the transmission line is stably connected to the glass surface because the amplifier module and the antenna pattern having a pair of feeding parts are connected via two linear conductors printed on the glass surface. Therefore, the electrical characteristics of the transmission line can be stably secured, and the antenna performance is stabilized.
  • the characteristic impedance of the transmission line adjustable within the range of 75 [ ⁇ ] to 200 [ ⁇ ], for example, the line width of the transmission line pattern is reduced and the line spacing is also manufactured.
  • a special manufacturing process is not required, and thus both electrical characteristics and manufacturing cost can be achieved.
  • the glass antenna system according to the present embodiment is attached to a rear window of a vehicle, for example.
  • each antenna pattern for the DTV antenna 10, the AM radio antenna 20, and the FM radio antenna 30 is mounted in an empty area on the glass surface 1 of the rear window where the defogger 40 is mounted.
  • the DTV antenna 10 will be exemplified and described in detail as a glass antenna system according to the present embodiment.
  • the DTV antenna 10 includes an amplifier module 12 installed on the glass surface 1 (FIG. 1) that amplifies a signal received by the antenna element, and a pair of two-point feeding unit 110 as the antenna element. And an antenna pattern 11 having a transmission line 13. In the transmission line 13, two linear conductors are formed on the glass surface 1 as a printed pattern.
  • the glass antenna system (DTV antenna 10) has a structure in which the amplifier module 12 and the antenna pattern 11 are connected by a transmission line 13.
  • the transmission line 13 is composed of two parallel linear conductors, and has a line width d of 10 mm to 0.5 mm and a line interval D (from the center line of the line width of one linear conductor to the other linear conductor.
  • the distance between the center lines of the line width is 3.0 to 0.5 mm.
  • the amplifier pattern 12 is not directly connected to the antenna pattern 11, but the antenna pattern 11 and the amplifier module 12 are connected via the transmission line 13.
  • the transmission line 13 Since the transmission line 13 is formed on the glass surface 1 stably by forming the transmission line 13 composed of two parallel linear conductors in this way, the electrical characteristics of the transmission line 13 are improved. It can be secured stably, and this stabilizes the antenna performance. Moreover, since the antenna pattern 11 can be designed in a state independent of the amplifier module 12, the antenna pattern 11 should be arranged independently at a position where the antenna performance can be ensured to the maximum even if the feeding position is limited due to the vehicle type. Can do. Therefore, the antenna performance is improved.
  • the transmission line 13 is formed on the glass surface 1, the size of the glass so as not to cause a problem in manufacturing and aesthetics due to the characteristics of glass as a dielectric having a relatively large relative dielectric constant, It can suppress that the impedance of a transmission line becomes higher than necessary.
  • the transmission line impedance can be adjusted in the range of 75 to 200 [ ⁇ ].
  • the line width d of the print pattern of the transmission line 13 is preferably 1 to 5 [mm].
  • the characteristic impedance of the input part of the amplifier module 12 is desirably 150 [ ⁇ ] or less. Therefore, the line impedance of the printed pattern of the transmission line 13 is preferably 150 [ ⁇ ] or less. In this case, by setting the line width d to 1 to 5 [mm] and the line interval D to 0.5 to 3 [mm], the line impedance can be made 150 [ ⁇ ] or less, It is possible to form a transmission line with no problem from the point of view of beauty.
  • the meaning of setting the transmission line impedance in the range of 75 to 200 [ ⁇ ] is as follows.
  • the characteristic impedance of the antenna is higher than a general value (50 [ ⁇ ] to 75 [ ⁇ ]) of 75 to 300 [ ⁇ ].
  • the amplifier module 12 is disposed in the vicinity of the antenna in order to ensure stable reception signal quality.
  • the characteristic impedance of the input portion of the amplifier module 12 is noise resistance. 200 [ ⁇ ] or less is appropriate from the viewpoint of securing the value, and it is not preferable to set the value larger than necessary. Therefore, the characteristic impedance of the transmission line 13 for connecting the antenna pattern 11 and the amplifier module 12 needs to be adjustable in the range of 75 to 200 [ ⁇ ].
  • the characteristic impedance Z 0 of the transmission line 13 formed on the glass surface 1 can be approximated by the following arithmetic expression (1).
  • a and B are constants
  • d is a line width [mm]
  • D is an interval [mm].
  • the characteristic impedance Z 0 of the parallel two lines can be obtained by the following equation (2).
  • the part corresponding to the constant A in the equation (1) is proportional to “1 / ⁇ ( ⁇ s)”.
  • This “1 / ⁇ ( ⁇ s)” corresponds to the wavelength shortening rate of the radio wave in the dielectric having the relative dielectric constant ⁇ s. Therefore, it is considered that the constant A in the calculation formula (1) is also proportional to the wavelength shortening rate of the radio wave on the glass surface.
  • the wavelength shortening rate on the glass surface is related to the thickness of the glass used and the relative dielectric constant of the glass.
  • Tempered glass and laminated glass are used as glass for vehicles, but the glass surface wavelength shortening rate is also limited to a predetermined range due to the limited range of relative permittivity and thickness when these glasses are used. .
  • a range that can be taken by the constant A of the arithmetic expression (1) is obtained from this limited range, 115 ⁇ A ⁇ 160.
  • the constant B of the four samples can vary from 24 to 28.
  • the constant B was sufficient if it was in the range of 20 ⁇ B ⁇ 30.
  • FIGS. 3A and 3B are diagrams showing the evaluation conditions of the present example having the transmission line 13 and the comparative example not having the transmission line 13 when the layout position of the antenna pattern 11 is made common. is there.
  • FIG. 3A shows the evaluation conditions of the present example having the transmission line 13 having a total length of 130 mm, and the characteristic evaluation point EP was used as the transmission line terminal.
  • FIG. 3B shows the evaluation conditions of the comparative example that does not have the transmission line 13, and the characteristic evaluation point EP is set directly below the pair of power feeding parts.
  • FIG. 4 shows the results of evaluation according to the evaluation conditions in comparison with the frequency characteristics of the present example and the comparative example.
  • the average gain [dB] on the vertical axis is normalized so that the average value in the entire band (470 to 720 MHz) of the reference comparative example is 0 [dB].
  • the maximum value is 0.8 [dB] and the minimum value is ⁇ 1.1 [dB] (the average in the band is ⁇ 0.
  • the maximum value is 1.2 [dB] and the minimum value is ⁇ 1.5 [dB] (in-band average is 0.0 [dB]).
  • FIGS. 5A and 5B show the evaluation conditions of the present embodiment having the transmission line 13 and the comparative example not having the transmission line 13 when the mounting position of the amplifier module 12 is made common.
  • FIG. 5A shows the present embodiment in which the amplifier module is mounted on the side of the glass, for example, and has a transmission line 13 that feeds the upper side when viewed from the antenna pattern 11.
  • FIG. These are the comparative examples which do not have the transmission line 13 used as side feeding even if it sees from an unten pattern. Note that antenna patterns of other media are arranged in the vicinity in both the present example and the comparative example.
  • FIG. 6 shows the frequency characteristics of the present embodiment and the comparative example in comparison.
  • the average gain [dB] on the vertical axis is normalized so that the average value in the entire band (470 to 720 MHz) of the reference comparative example is 0 [dB].
  • the maximum value is 3.1 [dB]
  • the minimum value is ⁇ 0.9 [dB] (in-band average is 0.4 [dB])
  • the comparison is made.
  • the maximum value is 1.9 [dB] and the minimum value is ⁇ 2.4 [dB] (in-band average is 0.0 [dB]).
  • the antenna pattern 11 is connected by connecting the antenna pattern 11 having the pair of power feeding units 110 and the amplifier module 12 using the transmission line 13.
  • the amplifier module 12 can be arranged on the glass surface 1 in an independent manner.
  • the antenna pattern 11 can be designed without depending on the layout position of the amplifier module 12, and thus the degree of freedom in design is increased.
  • the transmission line 13 is formed by two parallel linear conductors, it is not necessary to increase the area of the print pattern of the transmission line 13 more than necessary, and there is no fear of deteriorating the appearance.
  • the transmission line 13 is directly connected to the antenna pattern 11 having a pair of two-point feeding units 110 that operate as a balanced or nearly balanced antenna, the transmission line 13 itself is also balanced, so that the antenna characteristics Does not become unstable.
  • the amplifier module 12 can be arranged independently of the antenna pattern 11, a dedicated concealment cover is not required, and the amplifier module 12 can be installed, for example, on a glass corner or a pillar cover.
  • the pattern 11 itself can be set at an arbitrary position where performance can be easily secured. Therefore, even if there is a restriction on the layout position of the amplifier module 12, the antenna pattern 11 can be laid out at a position convenient for securing the antenna performance, and improvement of the antenna performance can be expected. That is, it is possible to avoid unnecessary antenna performance degradation due to different layouts for each vehicle type.
  • the transmission line 13 since a printed pattern printed on the glass surface 1 is used as the transmission line 13 that connects the amplifier module 12 and the antenna pattern 11, the transmission line 13 is stably formed on the glass surface 1, and thus the transmission line Since the electrical characteristics of 13 can be stably secured, the antenna performance is also stabilized.
  • a special manufacturing process is not required and the manufacturing cost does not increase.
  • the characteristic impedance to 150 [ ⁇ ] or less, it is not necessary to unnecessarily increase the characteristic impedance of the input section of the amplifier module 12 to be used, and a special amplifier module 12 design is not required.
  • the line interval needs to be 0.5 [mm] or more, but the characteristic impedance increases as the line interval increases.
  • the characteristic impedance increases as the line interval increases.
  • the line width is increased more than necessary. This causes a problem in aesthetics or glass modeling. Therefore, by setting the characteristic impedance to 70 [ ⁇ ] to 150 [ ⁇ ], both electrical characteristics and manufacturing cost can be achieved.
  • the two linear conductors used for the transmission line 13 shall be parallel in all the parts from the anten pattern 11 to the amplifier module 12.
  • a two-line pattern that is partially parallel may be used depending on the structure of the input section of the amplifier module 12.
  • the present invention is suitable for use in a DTV antenna system for receiving a terrestrial digital broadcast band 470-720 [MHz] mounted on a window glass of a vehicle.

Abstract

La présente invention concerne un système antenne sur vitre (10) qui est pourvu des éléments suivants : un motif antenne (11), qui comporte une paire d'unité d'alimentation en énergie électrique (110), imprimé sur une surface de vitre (1) ; un module amplificateur (12) qui amplifie un signal reçu par le motif antenne et est positionné sur la surface de vitre (1) ; et des lignes de transmission (13) qui comprennent deux conducteurs linéaires qui sont imprimés sur la surface de vitre, présentent une largeur (d) et un espacement (D) nécessaire pour s'adapter à l'impédance caractéristique du motif antenne (11), connectent le motif antenne (11) et le module amplificateur (12), et sont disposées de sorte qu'au moins une partie des lignes soient parallèles.
PCT/JP2012/067183 2011-09-16 2012-07-05 Système antenne sur vitre WO2013038784A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011203520 2011-09-16
JP2011-203520 2011-09-16

Publications (1)

Publication Number Publication Date
WO2013038784A1 true WO2013038784A1 (fr) 2013-03-21

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PCT/JP2012/067183 WO2013038784A1 (fr) 2011-09-16 2012-07-05 Système antenne sur vitre

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9586861B2 (en) 2011-10-28 2017-03-07 Corning Incorporated Glass articles with discrete metallic silver layers and methods for making the same
US10116035B2 (en) 2015-04-30 2018-10-30 Corning Incorporated Electrically conductive articles with discrete metallic silver layers and methods for making same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04139904A (ja) * 1990-09-30 1992-05-13 Suzuki Motor Corp 平衡モードガラスアンテナ装置
JPH08148919A (ja) * 1994-11-16 1996-06-07 Asahi Glass Co Ltd 自動車用ガラスアンテナ
JP2008187383A (ja) * 2007-01-29 2008-08-14 Maspro Denkoh Corp フィルムアンテナ、電源供給装置、及び移動体用受信システム
JP2008236780A (ja) * 2003-08-29 2008-10-02 Fujitsu Ten Ltd アンテナ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4383814B2 (ja) * 2003-09-22 2009-12-16 富士通テン株式会社 薄型アンテナ及び受信装置
JP2006157845A (ja) * 2004-10-29 2006-06-15 Asahi Glass Co Ltd アンテナ装置
JP2008061115A (ja) * 2006-09-01 2008-03-13 Toyota Motor Corp アンテナ装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04139904A (ja) * 1990-09-30 1992-05-13 Suzuki Motor Corp 平衡モードガラスアンテナ装置
JPH08148919A (ja) * 1994-11-16 1996-06-07 Asahi Glass Co Ltd 自動車用ガラスアンテナ
JP2008236780A (ja) * 2003-08-29 2008-10-02 Fujitsu Ten Ltd アンテナ
JP2008187383A (ja) * 2007-01-29 2008-08-14 Maspro Denkoh Corp フィルムアンテナ、電源供給装置、及び移動体用受信システム

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9586861B2 (en) 2011-10-28 2017-03-07 Corning Incorporated Glass articles with discrete metallic silver layers and methods for making the same
US9975805B2 (en) 2011-10-28 2018-05-22 Corning Incorporated Glass articles with infrared reflectivity and methods for making the same
US11535555B2 (en) 2011-10-28 2022-12-27 Corning Incorporated Glass articles with infrared reflectivity and methods for making the same
US10116035B2 (en) 2015-04-30 2018-10-30 Corning Incorporated Electrically conductive articles with discrete metallic silver layers and methods for making same

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