CN101950853A - Vehicle glass antenna - Google Patents

Vehicle glass antenna Download PDF

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Publication number
CN101950853A
CN101950853A CN2010102261559A CN201010226155A CN101950853A CN 101950853 A CN101950853 A CN 101950853A CN 2010102261559 A CN2010102261559 A CN 2010102261559A CN 201010226155 A CN201010226155 A CN 201010226155A CN 101950853 A CN101950853 A CN 101950853A
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CN
China
Prior art keywords
antenna element
antenna
glass
vehicle
vehicle body
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.)
Pending
Application number
CN2010102261559A
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Chinese (zh)
Inventor
冈秀俊
水上光
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Nippon Sheet Glass Co Ltd
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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 CN101950853A publication Critical patent/CN101950853A/en
Pending legal-status Critical Current

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    • 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
    • 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

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  • Details Of Aerials (AREA)

Abstract

A vehicle glass antenna (20) is mounted on a window glass (13) provided on a vehicle body (11) so as to close an opening in the vehicle body (11). The glass antenna (20) includes an antenna element (21, 22, 20b) having at least a double-bend pattern.

Description

The vehicle glass antenna
Technical field
The present invention relates to be provided at the antenna on the glass for vehicle window of vehicle, and relate more specifically to be used for the glass antenna of vehicle, described glass antenna is suitable for the signal of receiving digital television frequency band.
Background technology
For the consideration of installing space and outward appearance, be installed in Digital Television (DTV) antenna in the vehicle and mainly adopt membrane structure on the glass for vehicle window that is installed in vehicle.The motor vehicles high frequency glass antenna that employing is installed in the form of film on the glass for vehicle window of vehicle is known in the art; For example, disclosed in TOHKEMY 2008-22538 communique (JP A 2,008 22538).
Figure 15 shows disclosed glass antenna in JP A 2,008 22538.
Antenna conductor 100 shown in Figure 15 is formed on the windshield 110.Antenna conductor 100 comprises first antenna element 101, second antenna element 102, first bonding conductor 103 and loop forming element 104.The U-shaped conductive pattern is formed by first antenna element 101, second antenna element 102 and first bonding conductor 103.
First antenna element 101 is connected via second bonding conductor 106 with power supply (feeder) 105, and forms ring by first antenna element 101, first bonding conductor 103 and loop forming element 104.
Therefore, because antenna conductor 100 has ring, antenna conductor can have a plurality of resonance frequencys, and may obtain high antenna gain level and high FB and can not sacrifice outward appearance on aesthetic than (anterior-posterior power ratio), even also is like this when the broadband broadcasting frequency.
Yet the distance between second antenna element 102 and the vehicle body edge be made up of metal is 1/4 wavelength or more in short-term, radiation impedance reduces, and the radiation efficiency of antenna reduces, and frequency bandwidth and direction character are applied restriction.
Therefore, according to the disclosed technology of TOHKEMY 2008-22538 communique, must be as second antenna element 102 of main antenna with the distance of about 100mm vehicle body edge separation from roof.
When the distance at distance vehicle body edge is about 100mm, the risk that exists second antenna element 102 to enter driver's the visual field, this makes and must improve.
In view of above-mentioned, continue to exist to technology requirement with second antenna element, 102 more close vehicle body edges.
Summary of the invention
Described glass antenna the purpose of this invention is to provide the glass antenna that is used for vehicle, even also can be realized high antenna performance when antenna element is arranged to very close vehicle body edge.
According to a first aspect of the invention, provide a kind of vehicle glass antenna that is used to install on the glass for vehicle window, described glass for vehicle window is arranged on the vehicle body so that the peristome in the inaccessible vehicle body, and wherein glass antenna comprises having at least twice antenna element that turns back pattern.
In the present invention, provide a kind of and have at least twice vehicle glass antenna of pattern that turns back that extends along the edge of vehicle body peristome, thereby make that may improve receiving sensitivity makes the impedance loss that is caused by the vehicle body edge with the very close vehicle of antenna arrangement one-tenth minimize simultaneously.
Preferably, antenna element comprises first antenna element, second antenna element and the third antenna element of linearity, described first antenna element extends to the peristome and extends along the edge of peristome from power supply, described second antenna element turns back about 180 ° and extend towards first antenna element from the front end of first antenna element, about 180 ° and extend towards second antenna element from the front end warpage of second antenna element of third antenna elements.Therefore, can form the pattern that turns back twice, thereby make that may improve receiving sensitivity makes that simultaneously the impedance loss that is caused by the vehicle body edge that antenna element is arranged to very close vehicle minimizes by first, second and third antenna element.
Desirably, the third antenna arrangements of elements is in a distance, edge of distance peristome, and this distance is equal to or less than ten sixths of a wavelength of preset frequency.Therefore, because the third antenna arrangements of elements that is arranged in the lowermost part of glass antenna is equal to or less than the short distance of ten sixths of a wavelength of preset frequency at the edge of distance peristome, therefore the third antenna element does not influence the visual field during driving.
In a preferred form, the length of third antenna element is set to by LVFS (shortening rate) being multiply by half value that obtains of a wavelength of preset frequency.Therefore, antenna pattern is a simple designs.
Description of drawings
To only describe preferred embodiments more of the present invention by way of example with reference to the accompanying drawings in detail hereinafter, in the accompanying drawings:
Fig. 1 describes to adopt the plan view from above of using the vehicle of glass antenna according to the vehicle of the embodiment of the invention;
Fig. 2 (a) and (b) be to describe according to the vehicle of embodiment with the basic structure of glass antenna and the schematic diagram of part dimension;
Fig. 3 (a)-(d) shows through the schematic diagram of measured vehicle with the representative pattern of glass antenna;
Fig. 4 shows at the curve chart of vehicle with the correlation between size and the sensitivity of turning back of glass antenna;
Fig. 5 (a)-(c) shows to be used for turning back and is of a size of 0,25 and the curve chart of the variation of the VSWR of 50mm;
Fig. 6 (a)-(c) shows to be used for turning back and is of a size of 75,80 and the curve chart of the variation of the VSWR of 90mm;
Fig. 7 (a)-(c) shows to be used for turning back and is of a size of 95,100 and the curve chart of the variation of the VSWR of 105mm;
Fig. 8 (a)-(c) shows to be used for turning back and is of a size of 110,115 and the curve chart of the variation of the VSWR of 120mm;
Fig. 9 (a)-(c) shows to be used for turning back and is of a size of 125,130 and the curve chart of the variation of the VSWR of 140mm;
Figure 10 shows the curve chart of the variation of the VSWR that is of a size of 150mm of being used for turning back;
Figure 11 shows the view through the pattern of main antenna element of measuring and the distance between the vehicle body edge;
Figure 12 shows the distance between main antenna element and the vehicle body edge and the curve chart of the correlation between the change of sensitivity;
Figure 13 shows the view through the pattern of the leement duration of the main antenna element of measuring;
Figure 14 shows the curve chart of the leement duration and the correlation between the sensitivity of main antenna element; And
Figure 15 shows the schematic diagram of conventional vehicles with the structure of glass antenna.
Embodiment
Vehicle according to the invention can be installed on the glass for vehicle window of vehicle with glass antenna.Specifically, vehicle 10 is equipped with glass for vehicle window, and this glass for vehicle window comprises that (L is the symbol on an expression left side, and R is the right symbol of expression for the left front post 12L that is assemblied in vehicle body 11 and right front post 12R; Hereinafter employing similarly) windshield 13 between, back door and window 19L and the 19R that is assemblied in the rear window 15 between rear pillar 14L and the 14R, the preceding door and window 17L that can be installed to Qianmen 16L and 16R and 17R with raising and reduce and can be installed to back door 18L and 18R with raising and reduce.
Vehicle can be installed on above-mentioned any glass for vehicle window with glass antenna 20, but in the present embodiment, antenna is provided at the roughly top center part of windshield 13.Vehicle mainly is the DTV antenna with glass antenna 20, and described DTV antenna mainly is designed for the radio wave that receives land digital broadcasting by land UHF (ultra-high frequency) frequency band that uses in-car TV.
Vehicle is described in Fig. 2 with the details of glass antenna 20.
Vehicle is installed to glass antenna 20 and is arranged on the vehicle body 11 so that the glass for vehicle window 13 of the peristome in the inaccessible vehicle body 11, shown in Fig. 2 (a).Vehicle comprises impedance adjustment element 20a, main antenna element 20b and power supply 20c as antenna body with glass antenna 20, and they are mounted to very the edge (being called vehicle body edge 24 hereinafter) near the peristome of vehicle body 11.Reference numeral 25 expressions are installed in the glass edge of the glass for vehicle window 13 of vehicle body 11 front portions.
Impedance adjustment element 20a is described in further detail.
Impedance adjustment element 20a is made up of the conductor of linearity, and comprises first antenna element 21 and second antenna element 22, shown in Fig. 2 (b).
First antenna element 21 is to extend and the conductor of the linearity that forms from power supply 20c along vehicle body edge 24.Second antenna element 22 is from the front position of first antenna element 21 back 180 ° of warpages and the linearity conductor that forms and extend towards first antenna element 21.Two elements of this paper are roughly towards extending parallel to each other.
The main antenna element 20b that is depicted as the third antenna element is from the front end of second antenna element 22 that constitutes impedance adjustment element 20a about 180 ° and the linearity conductor that forms and extend towards second antenna element 22 of warpage back.These elements are roughly towards extending parallel to each other.
It hereinafter is the description of best illustration of the size of above-mentioned linearity conductor.
Best, constituting first antenna element 21 of impedance adjustment element 20a and the size a that turns back of second antenna element 22 is 100mm, the leement duration d of main antenna element 20b is 150mm, between first and second antenna patterns and the conductor gap c between impedance adjustment element 20a (second antenna element 22) and the main antenna element 20b all be 5mm.Conductor gap c is that the reason of 5mm is, carries out balance in the performance of improving antenna or the design between the size (reduction installing space), for the conductor gap, in the optimum range of gravel size decision ground between 3mm to 20mm.
Distance b between the vehicle body edge 24 of main antenna element 20b and vehicle body 11 is 30mm or still less best.It is according to will hereinafter be described.Power supply point 20c and impedance adjustment element 20a turn back a little between gap e best for 5mm.The gravel size decision ground of the employed power supply point of this paper (terminal 20b) is 20mm * 12mm, and antenna cable width is 0.2mm to 1.0mm.
The impedance adjustment element 20a that design has the pattern that turns back for twice is equivalent to electrically add impedance.In addition, the 100mm of distance b from conventional practice to the vehicle body edge 24 of vehicle body 11 is reduced to 30mm.
The result is, may suppress to be derived to be placed to very near the vehicle at vehicle body edge 24 impedance loss with glass antenna 20, so that do not hinder driver's the visual field, consequently can improve receiving sensitivity.
It hereinafter is the description of reason of optimum value of leement duration d of pointing out to be used for turn back distance b between size a, main antenna element 20b and the vehicle body edge 24 and the main antenna element 20b of impedance adjustment element 20a respectively.
(impedance adjustment element 20a turns back size a)
The inventor measures antenna sensitivity when following situation: the size a that turns back of the impedance adjustment element 20a shown in Fig. 2 (b) is changed to 150mm from 0, and frequency is changed to 800MHz from 400MHz.
The representative illustration of impedance adjustment element 20a has been shown in Fig. 3 (a)-(d) for ease of reference.Specifically, when the size a that turns back changes and antenna length d when keeping constant, for example the shape at the impedance adjustment element 20a of figure (a)-(d) illustrate changes.
The size a that turns back that Fig. 4 shows impedance adjustment element 20a has drawn corresponding sensitivity from 0 to the 150mm result who changes and at curve chart.Horizontal axis is illustrated in the frequency [MHz] (from 473MHz to 713MHz) in the middle of the DTV frequency band, and vertical axis is represented associated sensitivity [dBd].
When the size a that turns back had changed among 0 (nothing is turned back), 25mm, 50mm, 75mm, 80mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 150mm, sensitivity curve was represented with a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13 and a14 respectively.
The curve of representing with thick line a8 shows the sensitivity that obtains in the DTV frequency band, it compares especially stable with fine rule a1-a7 with a9-a14.
Thick line a8 is sensitive when the size a that turns back is 100mm, and it may guarantee that sensitivity is better than in shown in Fig. 3 other for example situation of a=25mm and 75mm and a=150mm of size of turning back.
Yet, be known that the maximum voltage of the standing wave that occurs in power supply point 20c place and the ratio between the minimum voltage with VSWR (voltage standing wave ratio) expression, represent the matching degree between the load impedance of characteristic impedance and feeder line.Under the situation of preferred coupling, VSWR is 1.
When turning back change in size, VSWR changes equally.Given this, the inventor has studied the correlation of turning back between size and the VSWR.The result illustrates from Fig. 5-10.
Fig. 5-10 shows the VSWR at the some place of 473MHz, 575MHz, 586MHz, 713MHz, and its medium frequency (MHz of unit) is plotted on the trunnion axis, and VSWR is plotted on the vertical axes, and wherein 400MHz measures starting point, and 800MHz measures end point.
The result is, as can be seen, causes overall lower VSWR in the DTV frequency band in the size of turning back of 90mm shown in Fig. 6 (c) and Fig. 7 (a) and 95mm.When the 90mm of 6 (c), 473MHz is in the centre of rapid change curve, so therefore 95mm is more firm.
As mentioned above, can determine that 95mm is the preferred value of size of turning back from VSWR.
Next, why the 95mm that will attempt to describe potentially by measuring is the value of expectation.
473MHz frequency shown in Figure 4 is the frequency that is used for supposing description.
The 473MHz frequency has the poorest impedance in DTV frequency band (473-713MHz).Therefore, if provide description to minimum 473MHz, other so more superior frequency needn't be described.
Can multiply by (1/4) by a wavelength with preset frequency (design frequency) multiply by LVFS again and obtains the size of turning back.By with 300 divided by 473 values of determining a wavelength of preset frequency (design frequency).Therefore, the size a that turns back that calculates according to (300/473) * (1/4) * 0.6 is 95mm.When turning back, in digital TV frequency band, there is the precipitous decline of sensitivity near the 473MHz, shown in the a6 among Fig. 4 to 95mm; Therefore, in the present embodiment, 100mm is the turn back preferred value of size of the best.
As mentioned above, according to the vehicle of the embodiment of the invention with in the glass antenna 20, provide to have at least twice impedance adjustment element 20a that turns back pattern that extends along the edge of vehicle body 11 split shed portions and can make that may improve receiving sensitivity makes simultaneously and minimized by the impedance loss that impedance adjustment element 20a is arranged to very cause near vehicle body edge 24./ 4th of a wavelength by LVFS being multiply by preset frequency obtains the optimum value of the size of turning back under this condition.
(distance b between main antenna element 20b and the vehicle body edge 24)
Figure 11 shows the sensitivity measure pattern according to the distance between main antenna element 20b and the vehicle body edge 24, and Figure 12 shows the curve of the variation of expression sensitivity.
Specifically, when in the distance b shown in Figure 11 ' when being changed to 20mm, 30mm, 40mm, 60mm, 80mm, 100mm and 30mm (turn back and be 100mm), be expressed as b 1, b2, b3, b4, b5, b6 and b7 respectively in the mode of the change of sensitivity shown in Figure 12.
Apparent from Figure 12, when main antenna element 20b be placed to more close vehicle body edge 24 (during 100mm → 20mm), sensitivity decline and degradation under any frequency.In the DTV frequency band, be clear that, in the curve of representing with thick line b7, at the size a that turns back of impedance adjustment element 20a is distance b between 100mm and main antenna element 20b and the body component 24 ' be that 30mm (turning back at the 100mm place) locates, b1 to b6 compares with other curve, runs through whole DTV frequency band and keeps higher sensitivity.
Impedance adjustment element 20a is equipped with the turning back of size of matching frequency, sensitivity is inadequate under this frequency, because impedance is not adaptive, but since adaptive be the purpose of turning back, therefore impedance adjustment element 20a must be placed to very near vehicle body edge 24, so that do not form the antenna receiving element.In the present embodiment, distance preferably is equal to or less than ten sixths of a frequency wavelength.For example, when design frequency is 470MHz, b '=300/470/16=40mm so.
According to the vehicle of the invention described above embodiment with in the glass antenna 20, stand the impedance adjustment of impedance adjustment element 20a as the main antenna element 20b of the third antenna element at the minimum point place that is arranged in the pattern that turns back.Therefore, do not hinder during driving that main antenna element 20b can be arranged to very near vehicle body edge 24 under the prerequisite in the visual field.
(the leement duration d of main antenna element 20b)
Figure 13 shows the sensitivity measure pattern and the size thereof of the variation leement duration that is derived from main antenna element 20b, and Figure 14 shows the curve of the relation between expression leement duration and the sensitivity.
Specifically, represent with d1, d2, d3, d4, d5, d6, d7, d8 and d9 respectively among Figure 14 in the increment of the 5mm mode of change of sensitivity when 130mm is changed to 170mm as length (leement duration) d ' of main antenna element 20b shown in Figure 13.
Apparent from Figure 14, when the leement duration of main antenna element 20b is 150mm, runs through total DTV frequency band and obtain higher sensitivity on average as can be seen.
Adopt above-mentioned vehicle glass antenna 20 according to the embodiment of the invention, antenna pattern will more easily design so, because the leement duration of main antenna element 20b is configured to half value that obtains by a wavelength that LVFS be multiply by preset frequency.
Though should it is evident that the present invention can be applicable in the DYV frequency band of Japan, but the present invention also can be applicable to other national Digital Television frequency band, and the present invention is applicable to that vehicle is mounted to very close vehicle body edge with glass antenna so that realize in the situation in the good visual field during driving, the device that is used to optimize resonant resistance and improves receiving sensitivity.

Claims (4)

1. vehicle glass antenna that is installed on the glass for vehicle window, described glass for vehicle window are arranged on the automobile body so that the peristome in the inaccessible automobile body, and described glass antenna comprises:
Antenna element (21,22,20b), described antenna element (21,22,20b) have at least twice pattern that turns back.
2. glass antenna according to claim 1 is characterized in that, described antenna element comprises:
First antenna element (21) of linearity, first antenna element of described linearity extends from power supply (20c) edge along described peristome described peristome;
Second antenna element (22), described second antenna element turns back about 180 ° from the front end of described first antenna element (21), and extends along relative direction with described first antenna element; And
Third antenna element (20b), described third antenna element turns back about 180 ° from the front end of described second antenna element, and extends along relative direction with described second antenna element.
3. glass antenna according to claim 2 is characterized in that, described third antenna element (20b) is arranged to the edge distance apart from described peristome, and described distance is equal to or less than ten sixths of a wavelength of preset frequency.
4. according to claim 2 or 3 described glass antennas, it is characterized in that the length (d) of described third antenna element (20b) is configured to half value that obtains by a wavelength that LVFS be multiply by preset frequency.
CN2010102261559A 2009-07-08 2010-07-08 Vehicle glass antenna Pending CN101950853A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP162239/2009 2009-07-08
JP2009162239A JP5285521B2 (en) 2009-07-08 2009-07-08 Vehicle glass antenna and window glass

Publications (1)

Publication Number Publication Date
CN101950853A true CN101950853A (en) 2011-01-19

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CN2010102261559A Pending CN101950853A (en) 2009-07-08 2010-07-08 Vehicle glass antenna

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JP (1) JP5285521B2 (en)
CN (1) CN101950853A (en)

Cited By (1)

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CN107425254A (en) * 2016-05-10 2017-12-01 旭硝子株式会社 Car antenna

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Publication number Priority date Publication date Assignee Title
JP2013131889A (en) * 2011-12-21 2013-07-04 Central Glass Co Ltd Vehicular glass antenna
CN104756315B (en) * 2012-10-25 2017-07-25 旭硝子株式会社 Glass for vehicle window and its mounting structure
CN115335525A (en) * 2020-03-24 2022-11-11 国立大学法人岩手大学 Modified channelrhodopsins

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US4791425A (en) * 1985-05-20 1988-12-13 Toyota Jidosha Kaisha Window antenna for a vehicle
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US20080158074A1 (en) * 2006-12-28 2008-07-03 Agc Automotive Americas R&D, Inc. Multi-Band Strip Antenna

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US4791425A (en) * 1985-05-20 1988-12-13 Toyota Jidosha Kaisha Window antenna for a vehicle
EP1732160A1 (en) * 2005-06-10 2006-12-13 Matsushita Electric Industrial Co., Ltd. Dual-band digital audio broadcasting antenna
US20080158074A1 (en) * 2006-12-28 2008-07-03 Agc Automotive Americas R&D, Inc. Multi-Band Strip Antenna

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107425254A (en) * 2016-05-10 2017-12-01 旭硝子株式会社 Car antenna
CN107425254B (en) * 2016-05-10 2020-11-10 Ａｇｃ株式会社 Vehicle-mounted antenna

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JP5285521B2 (en) 2013-09-11
EP2273608A1 (en) 2011-01-12
JP2011019081A (en) 2011-01-27

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Application publication date: 20110119