CN1677747A - Vehicle-carried antenna device inhibiting mechanical shock resulted by vehicle running - Google Patents
Vehicle-carried antenna device inhibiting mechanical shock resulted by vehicle running Download PDFInfo
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- CN1677747A CN1677747A CN 200510063909 CN200510063909A CN1677747A CN 1677747 A CN1677747 A CN 1677747A CN 200510063909 CN200510063909 CN 200510063909 CN 200510063909 A CN200510063909 A CN 200510063909A CN 1677747 A CN1677747 A CN 1677747A
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Abstract
A vehicle-carried antenna device comprises a ground plate and an antenna with a horizontal portion extending paralleled with the ground plate and separated from the antenna, the relative ends of the horizontal portion are respectively connected or not with the ground plate. A dielectric is disposed near a free end on the ground plate and antenna, thus the movement of the free end is prevented. A cavity is formed inside the dielectric, capable of reducing the capacitance coupling between the antenna and ground plate.
Description
Technical field
The present invention relates to car antenna, relate in particular to and a kind ofly have ground plate and slab construction antenna (promptly, form by antenna element with generally flat cross section) or the line structure antenna is (promptly, antenna element by the cross section with circular forms) in-vehicle antenna apparatus, the part of antenna is extended along the direction that is parallel to ground plate.
Background technology
In the art, proposed polytype car antenna in the past, for example the slab construction antenna of transmission line type is for example being introduced among the Japanese patent publication NO.2002-290138.
The example of this existing car antenna has such antenna element, and it has approximate horizontal, promptly be roughly parallel to ground plate and with the separated part of this ground plate, this horizontal part has one with respect to the free-moving end of ground plate.Therefore, when vehicle ', the vibration that is produced by vehicle movement causes antenna element to damage easily or distortion.Because this reason proposes a kind of method, between the part of antenna element, arrange insulator near its free terminal, so that the motion of suppressing antenna parts, thereby the protection antenna.
If but do like this because capacity coupled level increases between antenna that the existence of insulator causes and the ground plate, will cause leakage current from antenna stream to ground plate.Because this reason, the scope of the frequency that can receive by antenna narrows down, and antenna performance is descended.
Plan as reply, it is contemplated that and one or more passive antenna parts are set (promptly, these passive antenna parts are not coupled, the aerial signal that receives with transmission, or be actuated to transmit radio wave), passive antenna parts of in the existing Japanese patent application NO.2002-290138 in above-mentioned this area, describing 6 for example.But, introduce the shortcoming that these additional parts bring the antenna assembly overall dimensions to increase.
Summary of the invention
An object of the present invention is by providing a kind of car antenna to overcome above-mentioned shortcoming, this car antenna can prevent the described antenna deformation and the vibration that cause because of motion that travelling of the vehicle of installing antenna causes, and can roughly stop the decline of described antenna performance thus, in addition, the overall dimensions of described antenna assembly does not increase.
For achieving the above object, according to first aspect, the invention provides a kind of in-vehicle antenna apparatus, it comprises ground plate and antenna, described antenna comprises that at least one is roughly parallel to described ground plate and separated horizontal part, and have first end that described relatively ground plate is fixed and connects, and with described first terminal separated second end.Described in-vehicle antenna apparatus also comprises insulator, and it inserts on described ground plate and the described horizontal part between the zone near second end.The invention is characterized in that formed described insulator inside has cavity, therefore, compare, reduced the capacitive coupling amount between described antenna and the described ground plate with using the insulator of not introducing this cavity.
As a result, when vehicle ', can prevent to cause that because of the motion of the vehicle of installing described antenna described antenna damages or distortion.In addition, by described cavity is set in described insulator, reduced the capacitive coupling level between described antenna and the described ground plate, therefore can reduce the amount of leakage current between described antenna and the described ground plate, make the performance of described antenna can not descend because of the introducing of described insulator.
Therefore, do not need to utilize one or more passive antenna parts compensating the decline of described antenna performance, thereby avoided because of introducing the increase of the described antenna overall dimensions that this parts cause.
According to a further aspect in the invention, preferably, described insulator is formed by bathtub construction, that is, shape is defined as rectangular channel, and this groove constitutes the described cavity in the insulator.Preferably, this insulator is disposed such, that is, its base portion bottom of groove (form) is disposed on the described horizontal part of described antenna the adjacent underneath near the zone of above-mentioned second end, and two sidepiece (forming the relative side of groove) is positioned on the described ground plate.
Because the parts with bathtub construction are produced easily, therefore, for described in-vehicle antenna apparatus, the present invention has easy production and than the advantage of low production cost.
Description of drawings
Fig. 1 is the shaft side figure of first embodiment of in-vehicle antenna apparatus;
Fig. 2 is the shaft side figure of second embodiment of in-vehicle antenna apparatus; And
Fig. 3 is the shaft side figure of the 3rd embodiment of in-vehicle antenna apparatus.
Embodiment
Fig. 1 shows first embodiment, and promptly in-vehicle antenna apparatus 1.It comprises improved folding monopole antenna 2, and the top ground plate 3 that improved folding monopole antenna 2 has been installed.Though do not illustrate in the drawings, the lid that is formed by electrical insulating material is disposed in the above and below of improved folding monopole antenna 2 and ground plate 3, is used to them that mechanical protection is provided, and with them and other electrical conductor insulated.Improved folding monopole antenna 2 is made up of single parts 4, and single parts 4 have elongated slab construction (that is, in the cross-sectional view vertical with bearing of trend, having big relatively major dimension and relative little secondary size), and is formed by foldable structure 7.Foldable structure 7 has this shape, that is, by the approximate centerpoint from parts 4 these parts are folded and to produce, and keeps planar structure simultaneously, thereby makes foldable structure 7 have two sidepieces that roughly are parallel to each other 5 and 6. Sidepiece 5 and 6 respectively at the turning 8 and 9 places, turning form roughly right angle turn of bilge, to form horizontal part 10 and 11 separately, horizontal part 10 and 11 is parallel to the upper surface of ground plate 3 separately and separates with it, promptly, two horizontal parts 10,11 above-mentioned major dimension separately is parallel to ground plate 3. Turning 8 and 9 also defines the vertical portion 12 and 13 of sidepiece 5 and 6 respectively.Be connected two horizontal parts 10 on the horizontal part 10,11 of sidepiece 5,6 and the parts 4,11 part (promptly, the core of foldable structure 7) combine, be used as " horizontal part " of improved folding monopole antenna 2, it comprises all and ground plate 3 parallel and separated parts on the parts 4.
The external end part 4a of parts 4 (in this example sidepiece 5 farthest terminal) is fixedly attached to the upper surface 3a of ground plate 3 by devices (not drawing among the figure) such as for example hold-down screws, contacts with ground plate 3.Another external end part 4b of parts 4 (in this example sidepiece 6 farthest terminal) by with fixing pitch arrangement above the upper surface 3a of ground plate 3, for example do not contact with ground plate 3.
Can find out thus, the above-mentioned horizontal part of improved folding monopole antenna 2 has an end (by the vertical portion 12 of parts 4) fixedly connected with respect to ground plate 3, and the free terminal that be free of attachment to ground plate 3 opposite with this end (is positioned at the right side of parts 4, as shown in Figure 1).
Suppose that parts 4 are the mobile phone antennas that are used for the 800MHz radio wave band, the length at 7 center from end portion 4a to foldable structure, and from the center of folded part 7 to the length of end portion 4b, to make by 1/4 of 800MHz radio wavelength separately, that is, the total length of parts 4 will be 1/2 of a 800MHz radio wavelength.
Between the zone that insulator 15 is disposed on the upper surface 3a of ground plate 3 and the parts 4 and the above-mentioned free terminal of the horizontal part of improved folding monopole antenna 2 is approaching.Insulator 15 is formed by for example synthetic resin material or ceramic material, and has the shape of essentially rectangular body, and forms porose 15a on its lower surface, and cavity 16 extends to insulator 15 inside from hole 15a, as shown in Figure 1.
On ground plate 3 and the parts 4 and arrange between the approaching part of the free terminal of improved folding monopole antenna 2 that the result of insulator 15 is that the motion of the free terminal of improved folding monopole antenna 2 is effectively suppressed.Therefore, when installing the vehicle ' of antenna, improved folding monopole antenna 2 can not cause owing to the influence of vibration damaging or distortion.In addition, the 15 inner results that form cavity 16 are at insulator, the increase of capacity coupled amount between improved folding monopole antenna 2 and ground plate 3 that causes owing to the existence of insulator is effectively stoped, and has therefore reduced the leakage current from improved folding monopole antenna 2 to ground plate 3 that is caused by this capacitive coupling.Therefore, do not need to be provided with one or more passive antenna parts and compensate, so antenna assembly 1 can not cause the overall dimensions of antenna assembly to increase as introducing passive component with capacity coupled influence to this increase.
As can be seen from the above, the horizontal part design " free terminal " at antenna 2 means that when lacking insulator 15 this end does not link to each other with ground plate 3.Therefore, it is possible being fixedly attached to insulator 15 on ground plate 3 and the antenna element 4 simultaneously.But, this is the problem of design alternative, and the scope of stating in accessory claim of the present invention will comprise the structure of this form.Other embodiment that will introduce below foregoing is applicable to too.
Second embodiment
Second embodiment, promptly in-vehicle antenna apparatus 21, are introduced with reference to Fig. 2.With the parts of the corresponding present embodiment of the parts of first embodiment by the Reference numeral mark identical with first embodiment, and, will be omitted further specifying of these parts.The difference of the present embodiment and first embodiment is, insulator 22 (can be formed by the suitable material that the insulator 15 that is first embodiment is introduced) is set between improved folding monopole antenna 2 and ground plate 3, rather than the insulator 15 of first embodiment.Insulator 22 has bathtub construction as shown in Figure 2, and it has the cavity 23 of rectangular channel shape, and the horizontal part 10 of the axis of groove and sidepiece 5 and 6 and 11 bearing of trend are rectangular, that is, rectangular with arrow line A1-A2 indicated direction.Insulator 22 has the base portion that constitutes trench bottom, and two relative sidepieces that constitute the groove side.Insulator 22 is disposed such, promptly, its sidepiece is disposed on the ground plate 3, its base portion is disposed on the parts 4 adjacent underneath with the approaching part of the free terminal of the horizontal part of improved folding monopole antenna 2, (in this example, be arranged on the parts 4 form, on the sidepiece 5,6 away from the below of the part of turning 8 and 9).
Second embodiment has the advantage similar to first embodiment, in addition, because the cavity 23 of insulator 22 is easy to formation, so in-vehicle antenna apparatus 1 can be produced with the low cost of comparing with first embodiment.
The 3rd embodiment
The 3rd embodiment, promptly in-vehicle antenna apparatus 31, are introduced with reference to Fig. 3.With the parts of the corresponding present embodiment of the parts of first embodiment by the Reference numeral mark identical with first embodiment, and, will be omitted further specifying of these parts.The difference of the 3rd embodiment and first embodiment is, insulator 32 (can be formed by the suitable material that the insulator 15 that is first embodiment is introduced) is set between improved folding monopole antenna 2 and ground plate 3, rather than the insulator 15 of first embodiment.Identical with introducing of carrying out of insulator 22 to second embodiment, insulator 32 has bathtub construction as shown in Figure 3, it has the cavity 33 of rectangular channel shape, the axis orientation of groove is along the horizontal part 10 of sidepiece 5 and 6 and 11 bearing of trend, that is, rectangular with arrow line B1-B2 indicated direction.Identical with the mode of the insulator 22 of second embodiment, insulator 32 is disposed such, that is, its sidepiece is disposed on the ground plate 3, and its base portion is disposed on the parts 4 adjacent underneath with the approaching part of the free terminal of the horizontal part of improved folding monopole antenna 2.
Identical with second embodiment, the 3rd embodiment has the advantage similar to first embodiment, in addition, because the cavity 33 of insulator 32 forms easily, so in-vehicle antenna apparatus 1 can be produced with the low cost of comparing with first embodiment.
Other embodiment
Should be noted that, the invention is not restricted to be applied in the foregoing description, it is also contemplated that different optional forms.For example, the folding monopole antenna that the invention is not restricted to the slab construction type (promptly, the folding monopole antenna that forms by parts) with writing board shape, can also be applied to equally on the other forms of slab construction antenna, inverse-Fourier type (inverse Fourier type) antenna for example, or fall-inverted-L antenna etc.
In addition, the invention is not restricted to be applied to the folding monopole antenna of slab construction type, can also be applied to line structure antenna (that is the antenna that forms by one or more parts) equally with circular cross sectional shape.
In addition, the present invention uses same being suitable for for the mobile phone that is operated in 1.5GHz or 2GHz level radio frequency band.
In addition, the invention is not restricted to be applied in the use of mobile phone, can also be applied to equally in the use of WLAN (wireless local area network) (LAN) device, or be applied to short-range radio communications.
In addition, have the aerial array of equal length by using each parts, the present invention can be applied in the multiple reception application, maybe can be applied in the multifrequency antenna of a plurality of different-waveband reception/emitting radio wave.
Claims (4)
1. in-vehicle antenna apparatus comprises:
Ground plate,
Antenna, its have be oriented be roughly parallel to described ground plate and with the separated horizontal part of described ground plate, and have first end that is fixed and connects with respect to described ground plate, and second end that is not fixed and connects, and
Insulator, it is inserted between the zone of second end of approaching described horizontal part on described ground plate and the described horizontal part;
Wherein, described insulator has the cavity that is formed at wherein.
2. in-vehicle antenna apparatus according to claim 1, wherein, described insulator has bathtub construction, it forms the rectangular channel that constitutes described cavity, and wherein, described insulator is equipped with a base portion and two sidepieces, described base portion forms the bottom of described groove, and being disposed in the adjacent underneath of second end of the described horizontal part of described antenna, described two sidepieces form the opposite flank of described groove, and are placed in respectively on the described ground plate.
3. in-vehicle antenna apparatus according to claim 1, wherein, described antenna is to comprise one or more slab construction antennas with parts of generally flat cross section.
4. in-vehicle antenna apparatus according to claim 1, wherein, described antenna is to comprise one or more line structure antennas with parts of circular cross section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004099465A JP2005286800A (en) | 2004-03-30 | 2004-03-30 | On-vehicle antenna device |
| JP099465/2004 | 2004-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1677747A true CN1677747A (en) | 2005-10-05 |
Family
ID=35050132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510063909 Pending CN1677747A (en) | 2004-03-30 | 2005-03-30 | Vehicle-carried antenna device inhibiting mechanical shock resulted by vehicle running |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005286800A (en) |
| CN (1) | CN1677747A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4940404B2 (en) * | 2007-10-12 | 2012-05-30 | 小島プレス工業株式会社 | Folded antenna |
| JP5461277B2 (en) * | 2010-03-31 | 2014-04-02 | 長野日本無線株式会社 | Antenna device, power transmission device, power reception device, and non-contact power transmission system |
-
2004
- 2004-03-30 JP JP2004099465A patent/JP2005286800A/en active Pending
-
2005
- 2005-03-30 CN CN 200510063909 patent/CN1677747A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005286800A (en) | 2005-10-13 |
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