CN100454660C - On-vehicle antenna device and method of mounting the same - Google Patents
On-vehicle antenna device and method of mounting the same Download PDFInfo
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- CN100454660C CN100454660C CNB2005100627926A CN200510062792A CN100454660C CN 100454660 C CN100454660 C CN 100454660C CN B2005100627926 A CNB2005100627926 A CN B2005100627926A CN 200510062792 A CN200510062792 A CN 200510062792A CN 100454660 C CN100454660 C CN 100454660C
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- ground plate
- antenna apparatus
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- 238000000034 method Methods 0.000 title claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 4
- 230000005404 monopole Effects 0.000 abstract 2
- 239000004020 conductor Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
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Abstract
A vehicle antenna device is equipped with a tabular or line-shaped structure antenna, for example a deformed reentrant monopole antenna. The deformed reentrant monopole antenna is equipped with at least one terminal part which is formed to be tilted shape that is corresponding to the tilted shape of the lower part of a vehicle instrument plate. Under the condition, the antenna can be constructed to be provided with the optimal performance when being installed under the instrument plate.
Description
Technical field
The present invention relates to a kind of in-vehicle antenna apparatus with tabular or linear structure antenna and a kind of in-vehicle antenna apparatus be installed in the method for instrument board below, described instrument board be formed along from the rear portion of vehicle to the anterior inclination that is directed downwards.
Background technology
The someone has proposed polytype car antenna in the prior art, for example such as the distortion transmission line formula plate antenna of describing among the Japanese Patent Application Publication document No.2002-290138.
Except distortion transmission line formula plate antenna, the example of this plate antenna also comprises: contrary Fourier antenna and the antenna of falling L etc.Under such antenna, the height of antenna (being vertical size) is more little, and the gain of antenna itself will be low more, and antenna gain also can reduce along with the reduction of antenna installation site.Yet, in recent years, can expect to make in-vehicle antenna apparatus be positioned at the below of the instrument board of vehicle, hinder the driving of vehicle to prevent antenna.Generally speaking, the shape of the following side of Vehicular instrument panel is such, promptly along from the rear end of vehicle to the inclination that is directed downwards of front end.For above-mentioned reasons and because the space of instrument board below is limited, therefore, when car antenna is installed on this position, just be difficult to obtain enough big antenna gain value.In other words, because the tilted shape of the following side of instrument board, low when the total height of antenna (for example being positioned at the ground plate top) itself and the square on the ground total height of antenna all can be the flat horizontal form than the following side of instrument board.
Summary of the invention
The purpose of this invention is to provide a kind of in-vehicle antenna apparatus and overcome the problems referred to above, described in-vehicle antenna apparatus can be positioned at the below of Vehicular instrument panel, and the performance can make the performance of antenna itself and antenna below being installed on described instrument board the time all than prior art in accessible performance good.
To achieve these goals, according to first aspect, the invention provides a kind of in-vehicle antenna apparatus that is used to be installed in the Vehicular instrument panel below, described instrument board has rear end from vehicle to the downward-sloping following side of front end, described in-vehicle antenna apparatus comprises an antenna, described antenna has tabular or wire (promptly shaft-like) structure, and its terminal part is formed along the inclination that is directed downwards from an end to the other end according to the tilted shape of the described following side of described instrument board.
Like this, because the described angled end portion of described antenna can be towards the front end layout of vehicle when described in-vehicle antenna apparatus is installed in the below of described instrument board, and because the tilted shape of the described following side of the tilted shape of described terminal part (or entire antenna) and described instrument board is consistent, therefore, described antenna height of (for example ground plate top) above the base portion of described in-vehicle antenna apparatus can obtain maximization, and the square on the ground total height of described antenna also can be formed big as far as possible.Thereby, even described antenna be positioned at described Vehicular instrument panel below the time, also can obtain the highest may other antenna performance of level, particularly can obtain the highest antenna gain that may level.
According on the other hand; this in-vehicle antenna apparatus comprises a cover cap; described cover cap is used to protect described antenna, and has at least one terminal part, and described terminal part quilt forms from an end to the other end downward-sloping according to the tilted shape of the described following side of described instrument board.This also helps to guarantee: described antenna above the base portion of described in-vehicle antenna apparatus total height and on the ground the side total height all big as far as possible.
According to another aspect, this in-vehicle antenna apparatus comprises a ground plate, and the end face of the described terminal part of described antenna and described ground plate over against.The described end face of the described terminal part of described antenna and the resistance value between the described ground plate are expressed as Z, receive or the frequency values of the radio wave of transmission is expressed as f by described antenna, the described end face of the described terminal part of described antenna and the capacitance between the described ground plate are expressed as C, dielectric constant values is expressed as ε, the area value of the described end face of described terminal part is expressed as S, the described end face of described terminal part and the distance table between the described ground plate are shown d, the predetermined value of impedance is expressed as Z0, described dwi hastasana is become special shape (the described tilted shape that comprises described terminal part) under the situation that satisfies following two conditions and it is arranged with respect to described ground plate:
Z＝1/(ω·C)＝1/(2πf·C)＞Z0
C＝ε·S/d
Like this, just can guarantee: Z with respect to Z0 (for example, at this Z0 is the characteristic impedance that the connection lead of described antenna for example has the coaxial cable of 50 Ω impedances, described connection lead is used for described antenna and reception/transmitting device are coupled together) enough big, thereby the HF leakage electric current from antenna end to described ground plate can be ignored.
Description of drawings
Fig. 1 is an oblique view, shows the general structure of first embodiment of in-vehicle antenna apparatus;
Fig. 2 A, 2B, 2C are respectively turn back partial top view, partial front elevation view and the partial side views of unipole antenna of the distortion of first embodiment, and they are used to illustrate the terminal part that is formed with incline structure; And
Fig. 3 is an oblique view, shows the general structure of second embodiment of in-vehicle antenna apparatus.
Embodiment
Below, will first embodiment be described referring to Fig. 1 and 2.As shown in Figure 1, in-vehicle antenna apparatus 1 comprises the distortion unipole antenna 2 of turning back, and it is improved transmission line formula antenna.In other words, the antenna that forms with the element that by cross section is circle is that linear structure (or rod shaped structure) antenna is different, and being out of shape the unipole antenna 2 of turning back is a kind of plate antennas.In-vehicle antenna apparatus 1 also comprises a ground plate 3, is out of shape the unipole antenna 2 of turning back and is installed on the described ground plate 3.Cover cap 4 (for ease of describing, it separates with the distortion unipole antenna 2 of turning back as shown in fig. 1) is placed in the turn back top of unipole antenna 2 and ground plate 3 of distortion, to protect them and the distortion unipole antenna 2 of turning back is come with the external conductor insulation.
Distortion is turned back unipole antenna 2 by the discrete component composition with elongated plate-like structure (that is, when seeing with the rectangular cross section of prolonging direction, having relatively large long limit size and relative less minor face size), and is formed with the structure 7 of turning back.The structure of turning back 7 can have and keeping under the tabular situation by roughly around the central point of the antenna element shape that antenna element produced of turning back, thereby the structure 7 of turning back has the sidepieces 5 and 6 of two location that roughly are parallel to each other.Sidepiece 5 and 6 is formed with the approximate right angle bend at their turning 8 and 9 respectively, to form horizontal part 10 and 11 separately respectively, described horizontal part 10 is all parallel with the upper surface of ground plate 3 with 11 and be spaced from, and promptly the above-mentioned long limit size of each horizontal part in these horizontal parts 10 and 11 all is parallel to ground plate 3 orientations.Turning 8 and 9 also defines the vertical portion 12 and 13 of sidepiece 5 and 6 respectively.
One end of described antenna element is widens shape, and is fixedly attached on the upper surface 3a of ground plate 3 in the mode that contacts with ground plate 3 by a screw 14.The other end of described antenna element is placed in above the upper surface 3a of ground plate 3 with fixed intervals, does not promptly contact with ground plate 3.
The end 2b that is not connected with ground plate 3 on the inner wire 15a of coaxial cable 15 and the described antenna element connects, and the outer conductor 15b of coaxial cable 15 is connected with the upper surface 3a of ground plate 3.
As shown in Figure 1, the turn back terminal part 16 of unipole antenna 2 of distortion has special shape as described below.When in-vehicle antenna apparatus 1 be installed in instrument board 17 in the vehicle under the time, terminal part 16 be positioned at instrument board 17 described following side lowermost extent promptly with the below in the most approaching zone of the front end of vehicle.Therefore for above-mentioned reasons, the turn back terminal part 16 of unipole antenna 2 of distortion is configured to along the be directed downwards inclination identical with the following side 17a of instrument board 17, promptly along from the rear portion of vehicle to the anterior inclination that is directed downwards.In other words, the tilted shape of antenna end degree portion 16 is determined according to the tilted shape of the following side 17a of instrument board 17.
Specifically, shown in Fig. 2 A to 2C, antenna end portion 16 is formed with one and ground plate 3 facing surfaces 16a.Impedance meter between surperficial 16a and the ground plate 3 is shown Z, being turned back by distortion, monopolar electrode 2 receives or the frequency representation of the radio wave of transmission is f, capacitance meter between surface 16a and the described ground plate is shown C, dielectric constant is expressed as ε, the cartographic represenation of area of surface 16a is S, distance table between surface 16a and the ground plate 3 is shown d, and the predetermined value of impedance is expressed as Z0, and then the tilted shape of antenna end portion 16 can satisfy under the situation of following two conditions definite at the same time:
Z＝1/(ω·C)＝1/(2πf·C)＞Z0.........(1)
C＝ε·S/d .........(2)
Being turned back by distortion, unipole antenna 2 receives or the frequency f of the radio wave of transmission for example can be about 800MHz, and area S, the predetermined impedance Z0 of described frequency values f, DIELECTRIC CONSTANT, surperficial 16a (50 Ω for example, it is the representative value of the characteristic impedance of coaxial cable) can be predetermined value.By with in the above-mentioned equation of these predetermined value substitutions, just can calculate turn back required separation distance d between the upper surface 3a of the surperficial 16a of unipole antenna 2 and ground plate 3 of distortion.
In other words, if Z0 is the characteristic impedance of coaxial cable 15, by determine to satisfy above-mentioned equation apart from the value of d and make Z enough big with respect to Z0, since ground plate 3 and distortion turn back between the surperficial 16a of unipole antenna 2 capacitive coupling and turn back unipole antenna 2 to the HF leakage electric current of ground plate 3 from distortion will be enough little, thereby transmitted signal power or received signal power can be in the distortion high efficiency of transmission between unipole antenna 2 and the coaxial cable 15 of turning back.
And, under the said structure of in-vehicle antenna apparatus 1, the cover cap 4 that is formed by the material of for example synthetic resin has a terminal part 18, its in the mode identical with the following side 17a of instrument board 17 promptly to turn back the identical mode of the antenna end portion 16 of unipole antenna 2 along being directed downwards inclination (promptly when in-vehicle antenna apparatus 1 is installed in the vehicle) from the rear end of vehicle to front end with distortion.
Result as the said structure of the in-vehicle antenna apparatus 1 of first embodiment, turn back under the antenna end portion 16 of unipole antenna 2 is shaped as with the downward-sloping situation of the tilted shape similar to the following side 17a of instrument board 17 in distortion, when in-vehicle antenna apparatus 1 is installed in the vehicle by this way, even antenna end portion 16 settles towards the front end of described vehicle, what distortion turned back that the comparable antenna end of height (promptly being positioned at the height of ground plate 3 tops) portion 16 that unipole antenna 2 has do not adopt that mode as mentioned above constructs may be highly big.In other words, by maximally utilising the free space of the following side 17a below that is positioned at instrument board 17, described structure can make the height maximization of horizontal part 10,11 above ground plate 3 of sidepiece 5 and 6.
Like this, being out of shape the effective depth of unipole antenna 2 above ground plate 3 of turning back can obtain increasing, and distortion turn back unipole antenna 2 on the ground the height of side also can obtain increasing, thereby, compare with the distortion structure that unipole antenna 2 is not provided with the antenna end portion 16 that is shaped in mode as mentioned above of turning back, can increase antenna gain.
In addition; because the terminal part 18 of the cover cap 4 of in-vehicle antenna apparatus 1 is a tilted shape; therefore cover cap 4 can be protected distortion turn back unipole antenna 2 and ground plate 3 effectively, and can make they and external conductor electric insulation, and the while has the above-mentioned advantage that tilted shape provided of antenna end portion again.
Second embodiment
Below, will be described as second embodiment of in-vehicle antenna apparatus 21 referring to Fig. 3.The member that the member with first embodiment in the present embodiment is identical is represented with the Reference numeral identical with first embodiment, and no longer these members is carried out more step ground description.The difference of the present embodiment and first embodiment is, a pair of distortion unipole antenna of turning back is installed in the top of ground plate 3 side by side.Specifically, the in-vehicle antenna apparatus 21 of present embodiment by a pair of distortion turn back unipole antenna 22 and 23, ground plate 3, be placed in being used on them and protect their cover cap 4 to form.The distortion of the present embodiment unipole antenna 22 of turning back has and the distortion of the first embodiment identical structure of unipole antenna 2 of turning back, and distortion the turn back mirror image of unipole antenna 2 of distortion that unipole antenna 23 is configured to first embodiment of turning back.Therefore, especially, distortion the turning back with respect to distortion and be reversed the position on the unipole antenna 2 with the turn back right side of the described end 2a of unipole antenna 2, part that 2b is corresponding and leftward position of distortion respectively in the unipole antenna 23 of turning back.
As shown in Figure 3, be out of shape the unipole antenna 22 and 23 of turning back and be formed with corresponding terminal part 24,25 respectively, each terminal part is respectively to be shaped with the distortion of the first embodiment identical mode of mode described in the terminal part 16a of unipole antenna 2 of turning back, even each terminal part in these terminal parts 24,25 is all downward-sloping towards its terminal.
Under the situation of present embodiment, each distortion unipole antenna 22,23 of turning back all can obtain and turn back the identical advantage of advantage described in the unipole antenna 2 of the distortion of first embodiment.And, use a pair of distortion unipole antenna 22,23 of turning back that the diversity reception of single received signal frequency can be provided, or combination is as multifrequency antenna.
Should be pointed out that the present invention is not limited to the foregoing description in application facet, but it is contemplated that the multiple different alternative form of employing.For example, the present invention is not limited to the tabular unipole antenna of turning back, but can similarly be applied to other forms of plate antenna, for example contrary Fourier blade profile antenna or inverted-L antenna etc.And the present invention can be applicable to the mobile phone application scenario of operating under 1.5GHz radio band or 2GHz wave band.Yet the present invention is not limited to the mobile phone purposes in application facet, but can be applied to Wireless LAN apparatus or near radio telecommunication equally.
And the present invention is not limited to the tabular unipole antenna of turning back in application facet, but can be applied to linear structure antenna (being the antenna that circular antenna element forms by cross section promptly) equally.
In addition, the described antenna that the present invention is not limited to adopt among the described embodiment has a situation that is formed the terminal part with a linear tilt shape, but can be applied to equally have towards the antenna of terminal with the downward-sloping terminal part of curve form.
In addition, the present invention is not limited to this situation, promptly only have the terminal part of described antenna be formed towards the described ground plate of antenna assembly tilt and described distal portion in the outer end of the part of on the described antenna and described ground plate almost parallel antenna assembly location (for example, embodiment illustrated in fig. 1 in a pair of horizontal part 10 and 11).Can equally described antenna configuration be become this form, promptly in the foregoing description with described ground plate almost parallel location whole this part be formed towards described ground plate.
Claims (8)
1. in-vehicle antenna apparatus that is used to be installed in the Vehicular instrument panel below, described instrument board has at least one following side, described following side be formed have along from the rear end of described vehicle to the shape that is directed downwards inclination of front end;
Wherein, described in-vehicle antenna apparatus comprises: an antenna, and it has at least one terminal part, and described terminal part quilt forms from an end to end opposite downward-sloping according to the described tilted shape of the described following side of described instrument board; A ground plate, described antenna are installed on the described ground plate, the end face of the described terminal part of described antenna and described ground plate over against.
2. in-vehicle antenna apparatus as claimed in claim 1; also comprise: a cover cap; it is used to protect described antenna; wherein; described cover cap has at least one terminal part, and described terminal part quilt forms from an end to end opposite downward-sloping according to the described downward-sloping shape of the described following side of described instrument board.
3. in-vehicle antenna apparatus as claimed in claim 1, it is characterized in that, the described end face of the described terminal part of described antenna and the resistance value between the described ground plate are expressed as Z, receive or the frequency values of the radio wave of transmission is expressed as f by described antenna, the described end face of the described terminal part of described antenna and the capacitance between the described ground plate are expressed as C, the described end face of described terminal part and the value representation of the dielectric constant between the described ground plate are ε, the area value of the described end face of described terminal part is expressed as S, the described end face of described terminal part and the distance table between the described ground plate are shown d, be used for the characteristic impedance that is connected lead that described antenna and reception or transmitting device are coupled together is expressed as Z0, so, the described terminal part of described at least antenna is formed downward-sloping and form and arrange with respect to described ground plate from an end to end opposite by the described tilted shape according to the described following side of described instrument board under the situation that satisfies following two conditions:
Z＝1/(ω·C)＝1/(2πf·C)＞Z0
C＝ε·S?/d
4. in-vehicle antenna apparatus as claimed in claim 1 is characterized in that, described antenna is a plate antenna, and it comprises one or more elements with flattened cross-sectional.
5. in-vehicle antenna apparatus as claimed in claim 1 is characterized in that, described antenna is a linear structure antenna, and it comprises one or more elements with circular cross section.
6. one kind is installed in the method for Vehicular instrument panel below with in-vehicle antenna apparatus, and described instrument board has at least one following side, described following side be formed along from the rear end of described vehicle to the inclination that is directed downwards of front end, described method comprises:
Make the antenna of described in-vehicle antenna apparatus have at least one terminal part, described terminal part is configured as along the terminal from the rear end of described terminal part to described terminal part by the described tilted shape according to the described following side of described instrument board and is directed downwards inclination, and
Described in-vehicle antenna apparatus is installed in the below of described instrument board, and makes the described terminal of the described terminal part of described antenna point to the described front end of described vehicle;
Wherein, described antenna is installed on the ground plate of described in-vehicle antenna apparatus, the end face of the described terminal part of described antenna and described ground plate over against.
7. in-vehicle antenna apparatus installation method as claimed in claim 6 is characterized in that, described antenna is a plate antenna, and it comprises one or more elements with flattened cross-sectional.
8. in-vehicle antenna apparatus installation method as claimed in claim 6 is characterized in that, described antenna is a linear structure antenna, and it comprises one or more elements with circular cross section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004099471A JP4055734B2 (en) | 2004-03-30 | 2004-03-30 | In-vehicle antenna device and mounting method of in-vehicle antenna device |
| JP099471/2004 | 2004-03-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1716692A CN1716692A (en) | 2006-01-04 |
| CN100454660C true CN100454660C (en) | 2009-01-21 |
Family
ID=35184705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100627926A Expired - Fee Related CN100454660C (en) | 2004-03-30 | 2005-03-30 | On-vehicle antenna device and method of mounting the same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4055734B2 (en) |
| CN (1) | CN100454660C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5212049B2 (en) * | 2008-11-27 | 2013-06-19 | マツダ株式会社 | Car radio receiver |
| CN104253314A (en) * | 2013-06-28 | 2014-12-31 | 耀登科技股份有限公司 | Mobile communication antenna system and antenna module thereof |
| CN104916902B (en) * | 2015-05-19 | 2019-06-28 | 力帆实业(集团)股份有限公司 | A kind of vehicle |
| WO2018155600A1 (en) * | 2017-02-23 | 2018-08-30 | 株式会社ヨコオ | Antenna device |
| JP7056900B2 (en) * | 2017-06-30 | 2022-04-19 | 学校法人立命館 | Wireless power transfer system |
| JP6679120B1 (en) | 2019-02-01 | 2020-04-15 | Ｎｅｃプラットフォームズ株式会社 | Wireless communication device and antenna configuration method |
| WO2023074490A1 (en) * | 2021-10-25 | 2023-05-04 | 株式会社ヨコオ | On-board antenna device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816837A (en) * | 1973-06-11 | 1974-06-11 | Gen Motors Corp | Instrument panel radio antenna |
| US3896448A (en) * | 1973-06-11 | 1975-07-22 | Gen Motors Corp | Instrument panel radio antenna |
| WO1999065736A1 (en) * | 1998-06-16 | 1999-12-23 | Lear Automotive Dearborn, Inc. | Integrated antenna and vehicle trim component |
| EP1206002A2 (en) * | 2000-11-13 | 2002-05-15 | Delphi Technologies, Inc. | Molded in place antenna assembly and method of making same |
| US20030083010A1 (en) * | 2001-10-25 | 2003-05-01 | Yuji Sugimoto | Instrument panel unit of vehicle having radio signal receiver |
-
2004
- 2004-03-30 JP JP2004099471A patent/JP4055734B2/en not_active Expired - Fee Related
-
2005
- 2005-03-30 CN CNB2005100627926A patent/CN100454660C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816837A (en) * | 1973-06-11 | 1974-06-11 | Gen Motors Corp | Instrument panel radio antenna |
| US3896448A (en) * | 1973-06-11 | 1975-07-22 | Gen Motors Corp | Instrument panel radio antenna |
| WO1999065736A1 (en) * | 1998-06-16 | 1999-12-23 | Lear Automotive Dearborn, Inc. | Integrated antenna and vehicle trim component |
| EP1206002A2 (en) * | 2000-11-13 | 2002-05-15 | Delphi Technologies, Inc. | Molded in place antenna assembly and method of making same |
| US20030083010A1 (en) * | 2001-10-25 | 2003-05-01 | Yuji Sugimoto | Instrument panel unit of vehicle having radio signal receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005286801A (en) | 2005-10-13 |
| JP4055734B2 (en) | 2008-03-05 |
| CN1716692A (en) | 2006-01-04 |
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