CN106252844B - Vehicle-mounted rearview mirror LTE antenna - Google Patents
Vehicle-mounted rearview mirror LTE antenna Download PDFInfo
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- CN106252844B CN106252844B CN201610861329.6A CN201610861329A CN106252844B CN 106252844 B CN106252844 B CN 106252844B CN 201610861329 A CN201610861329 A CN 201610861329A CN 106252844 B CN106252844 B CN 106252844B
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- rearview mirror
- vehicle
- lte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3266—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle using the mirror of the vehicle
Abstract
The invention provides a vehicle-mounted rearview mirror LTE antenna, which comprises an antenna main body, wherein the antenna main body comprises: a flexible media substrate for being adhesively mounted within a support frame of a rearview mirror, having a first surface facing away from the support frame; the antenna is mainly arranged at the lower part of the first surface of the flexible medium substrate, and the upper edge of the antenna is inclined at a certain angle so as to increase the distance between the antenna and the radiator; a feeder line connected from an inclined high end of the antenna main ground; the feed point is arranged on the first surface of the flexible medium substrate, is positioned at or close to the inclined high end of the antenna main ground and is connected with the feed line; and the radiator is arranged at the upper part of the first surface of the flexible medium substrate, is connected with the feed point and is used for signal radiation. The vehicle-mounted rearview mirror LTE antenna is small in size, simple in structure, capable of being well combined with a rearview mirror, and capable of playing a good antenna performance.
Description
Technical Field
The invention relates to the field of vehicle-mounted antennas, in particular to a vehicle-mounted rearview mirror LTE (Long Term Evolution, long term evolution technology) antenna.
Background
With the popularization of 4G technology, LTE antennas are beginning to be installed on more and more vehicles. How to realize the omnibearing signal coverage of the whole vehicle is a common problem.
There are several more common vehicle antenna forms: 1) The shark fin type LTE antenna is installed on the roof and has larger metal ground, so that the antenna has good performance, but because the antenna is far away from a vehicle-mounted host, a longer radio frequency wire is required, the cost of the radio frequency wire is high, and in addition, because of the size limitation of the shark fin, the isolation between the antennas is also a problem; 2) The sheet antenna is arranged on the vehicle-mounted host computer, is close to the vehicle-mounted host computer, has low loss and low cost of cables, but has poor environment and poor performance.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the vehicle-mounted rearview mirror LTE antenna which is small in size and simple in structure, and can be well combined with a rearview mirror to exert better antenna performance.
In order to solve the above problems, the present invention provides a vehicle-mounted rearview mirror LTE antenna, including an antenna main body, the antenna main body includes:
a flexible media substrate for being adhesively mounted within a support frame of a rearview mirror, having a first surface facing away from the support frame;
the antenna is mainly arranged at the lower part of the first surface of the flexible medium substrate, and the upper edge of the antenna is inclined at a certain angle so as to increase the distance between the antenna and the radiator;
a feeder line connected from an inclined high end of the antenna main ground;
the feed point is arranged on the first surface of the flexible medium substrate, is positioned at or close to the inclined high end of the antenna main ground and is connected with the feed line;
and the radiator is arranged at the upper part of the first surface of the flexible medium substrate, is connected with the feed point and is used for signal radiation.
According to one embodiment of the invention, the antenna body further comprises a rear view mirror, and the antenna body is attached and mounted into a support frame of the rear view mirror through the flexible medium substrate.
According to one embodiment of the invention, the rearview mirrors are a left rearview mirror and a right rearview mirror which are vehicle-mounted, and the antenna main body is arranged in each of the left rearview mirror and the right rearview mirror.
According to one embodiment of the invention, the portion of the antenna body provided with the antenna main ground is mounted towards the lower edge of the rear view mirror and the portion provided with the radiator is mounted towards the upper edge of the rear view mirror.
According to one embodiment of the invention, the flexible medium substrate is provided with an antenna positioning hole, is stuck into the support frame of the rearview mirror, and passes through the antenna positioning hole through an antenna fixing column to install and fix the antenna main body.
According to one embodiment of the invention, the radiator comprises:
a radiation extension branch extending upward from the feeder connection portion;
a low frequency radiating stub connected to an extension end of the radiating extension stub for generating a low frequency resonance;
and the high-frequency radiation branches are connected with extension ends of the radiation extension branches to generate high-frequency resonance.
According to one embodiment of the invention, the low frequency radiation branch comprises a low frequency radiation first branch and a low frequency radiation second branch, the low frequency radiation first branch and the low frequency radiation second branch are mutually connected and form a bending angle, and the bending direction faces one side of the high frequency radiation branch so as to generate low frequency resonance and additional high frequency resonance.
According to one embodiment of the invention, the length ratio of the low frequency radiation first branch and the low frequency radiation second branch is adjusted to obtain a suitable additional high frequency resonance.
According to an embodiment of the present invention, the antenna body further includes:
and the matching circuit structure is connected between the feed point and the radiator and is used for adjusting the input impedance of the antenna.
According to an embodiment of the present invention, the antenna body further includes:
and the parasitic branches extend from the inclined high end of the antenna main ground and are connected with the matching circuit structure so as to generate additional high-frequency resonance, adjust the coupling effect between the radiator and the antenna main ground and change the position and convergence condition of the antenna on the Schmitt original image by matching with the matching circuit structure.
According to one embodiment of the invention, the feed line is a coaxial line, an outer conductor of which is connected to the antenna body, and an inner conductor of which is connected to the feed point.
According to one embodiment of the invention, the feed line is laterally accessed from a sloped high end of the antenna body.
According to one embodiment of the invention, the connection part of the feeder line is fixed by dispensing package or by injection package.
According to one embodiment of the invention, the radiator and the antenna ground together form an antenna structure similar to or identical to a vertically placed half-wave element, increasing the gain of the antenna in the horizontal plane.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects:
1. the radiation patterns are printed on the flexible medium substrate, the antenna main body can be properly bent and then stuck on the rearview mirror support frame, so that the antenna is convenient to integrate in the rearview mirror, small in size and simple in structure;
2. the antenna main ground has a downward inclined chamfer with a certain angle between the upper edge and the side edge, so that the distance between the antenna main ground and the radiator is effectively increased, the transverse flow of current is reduced, the current of the antenna main ground can flow downwards due to the inclined upper edge, and the current of the radiator relatively flows upwards, so that the current distribution of the antenna is more symmetrical, and a wider low-frequency bandwidth is obtained;
3. multiple high-frequency resonances are generated through multiple technical means, so that the return loss bandwidth of the high-frequency LTE frequency band-10 dB is larger than 125MHz, the bandwidth is widened, and the existing main stream LTE frequency band is covered;
4. the radiator of the antenna and the antenna main ground form a mode similar to a mode of vertically placing a half-wave oscillator, so that the radiator of the antenna and the antenna main ground obtain larger gain in the horizontal direction, and the requirements of a vehicle-mounted antenna system can be well met;
5. the vehicle-mounted rearview mirror LTE antenna is arranged in the automobile rearview mirror, and because the rearview mirror is arranged outside the automobile body and is far away from the automobile body, if the left rearview mirror LTE antenna and the right rearview mirror LTE antenna work simultaneously, good signal coverage can be realized for the automobile, the distance from the vehicle-mounted host is also relatively short, and the cost and the line loss are relatively low.
Drawings
Fig. 1 is a schematic structural diagram of an LTE antenna of a vehicle-mounted rearview mirror according to an embodiment of the invention;
fig. 2 is a schematic structural view of the vehicle-mounted rearview mirror LTE antenna according to the embodiment of the invention mounted to a rearview mirror;
fig. 3 is a schematic diagram of return loss of an LTE antenna of the vehicle-mounted rearview mirror according to an embodiment of the invention;
FIG. 4 is a graph comparing antenna efficiency of an on-board rearview mirror LTE antenna of the present invention with that of a prior art antenna;
fig. 5 is a graph of the horizontal gain contrast of the LTE antenna of the vehicle mirror of the present invention with the existing antenna.
The figure indicates:
the antenna comprises a 1-antenna main body, a 11-flexible medium substrate, a 12-antenna main ground, a 13-radiation extension branch, a 141-low frequency radiation first branch, a 142-low frequency radiation second branch, a 15-high frequency radiation branch, a 16-matching circuit structure, a 17-parasitic branch, an 18-antenna positioning hole, a 19-feeder line, an outer conductor of a 191-feeder line, an inner conductor of a 192-feeder line, a support frame of a 2-rearview mirror, a 3-antenna fixing column and a 5-wrapping part.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present invention may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present invention is not limited to the specific embodiments disclosed below.
Because the inside space of the rearview mirror is narrow, the bandwidth of the traditional LTE antenna is difficult to widen and the radiation efficiency is difficult to improve due to the influence of elements such as a lens and a motor, the vehicle-mounted rearview mirror LTE antenna provided by the embodiment of the invention is small in size, simple in structure, and well combined with the rearview mirror, and the bandwidth of the antenna is widened, so that the full-band coverage of LTE is realized, and the radiation efficiency is high.
Referring to fig. 1, the vehicle-mounted rearview mirror LTE antenna of the present embodiment includes an antenna main body 1. The antenna main body 1 includes: a flexible dielectric substrate 11, an antenna main ground 12, a feed line 19, a feed point (not labeled in the figure) and a radiator.
The flexible medium substrate 11 has a certain flexibility, and can be bent appropriately, and the radiation pattern and ground of the antenna are arranged on the flexible medium substrate 11. The flexible dielectric substrate 11 may be attached and mounted into the support frame 2 of the rear view mirror, thereby mounting the antenna body 1 into the rear view mirror, concentrating space. The rearview mirror can be an existing rearview mirror, and is provided with a lens and a supporting frame 2 which are connected to form an inner accommodating space for accommodating the antenna of the embodiment of the invention. The surface of the flexible medium substrate 11 facing away from the support frame 2 is a first surface.
The antenna main ground 12 is disposed at a lower portion of the first surface of the flexible dielectric substrate 11. The feed line 19 is accessed from the inclined high end of the antenna main ground 12. The feed point is provided on the first surface of the flexible dielectric substrate 11 and is located at or near the slanted high end of the antenna main ground 12, connected to the feed line 19 for feeding. The radiator is arranged on the upper part of the first surface of the flexible medium substrate 11 and is connected with the feed point for signal radiation. It will be appreciated that the upper and lower portions are opposed.
The upper edge of the antenna main ground 12 is inclined at an angle to increase the spacing from the radiator. The radiator is located at the upper part of the first surface and the current fed by the feed line 19 is flowing upwards. If the upper edge of the antenna main ground 12 is not inclined, the current from the feeder 19 will have a transverse current, and the upper edge is inclined downwards, so that the current distribution of the antenna is more symmetrical, and a wider low-frequency bandwidth is obtained.
In fig. 1, the upper edge of the antenna main ground 12 is a straight line edge, and slopes downward from the left side to the right side, the feeder line 19 is further connected to the antenna main ground 12, and the current transmitted to the antenna main ground 12 by the feeder line 19 flows downward under the action of the sloped upper edge of the antenna main ground 12, and it is understood that the slope angle and the slope direction of the upper edge of the antenna main ground 12 are not limited to those shown in the drawings, and may be configured according to actual needs, and the shape of the upper edge may be appropriately adjusted instead of being limited to the straight line edge.
Referring to fig. 2, in one embodiment, the on-board rearview mirror LTE antenna may also include a rearview mirror, which may be a conventional rearview mirror on a conventional vehicle, with a mirror plate and support frame 2. The antenna body 1 is attached and mounted into the support frame 2 of the rear view mirror through the flexible dielectric substrate 11. The antenna main body 1 of the vehicle-mounted rearview mirror LTE antenna provided by the embodiment of the invention can be only 110mm long, 40mm wide and 0.2mm thick, meets the requirement of a narrow installation space in the rearview mirror, widens the antenna bandwidth, has better radiation performance, and is well combined with the rearview mirror.
Further, the rearview mirror is on-vehicle left side rearview mirror and right rearview mirror, all installs antenna main part 1 in left side rearview mirror and the right side rearview mirror, because the rearview mirror is outside the automobile body and far away from, if left and right sides rear mirror LTE antenna works simultaneously, can realize fine signal coverage to the vehicle to the distance from on-vehicle host computer is also nearer, and cost and line loss are all lower.
The mounting manner of the antenna body 1 in the rear view mirror can be seen in fig. 2, and preferably, the portion of the antenna body 1 provided with the antenna main ground 12 faces the lower edge of the rear view mirror, and the portion of the antenna body 1 provided with the radiator faces the upper edge of the rear view mirror, so that the antenna obtains the maximum effective radiation clearance. I.e. the upper part of the first surface of the flexible medium substrate 11 is close to the upper edge of the mirror and the lower part is close to the lower edge of the mirror. The upper edge of the rearview mirror refers to the edge of the top when the rearview mirror is mounted on a vehicle; the lower edge is correspondingly the bottom edge.
Referring to fig. 1 and 2, an antenna positioning hole 18 is formed in a flexible medium substrate 11, the flexible medium substrate 11 is adhered to a support frame 2 of a rear view mirror, the flexible medium substrate 11 can be bent to a certain extent according to the internal shape of the support frame 2 of the rear view mirror so as to adapt to space attachment, and after the flexible medium substrate 11 is adhered to the support frame 2, the antenna body 1 is installed and fixed through the antenna positioning hole 18 by an antenna fixing column 3. The connection between the antenna fixing post 3 and the support frame 2 may be, for example, but not limited to, a screw connection.
Referring to fig. 1, the radiator may specifically include: radiation extension branches 13, low frequency radiation branches and high frequency radiation branches 15. The radiation extension branch 13 extends upward from the connection portion of the feeder line 19 and the feed point. The low frequency radiation branch and the high frequency radiation branch 15 are main radiators of the antenna, and are connected to the extension end of the radiation extension branch 13. The low frequency radiating stub is configured to generate a low frequency resonance. The high frequency radiating stub 15 serves to generate high frequency resonance.
The low frequency radiation pattern may further include a low frequency radiation first pattern 141 and a low frequency radiation second pattern 142. The low frequency radiation first branch 141 and the low frequency radiation second branch 142 are interconnected and form a bending angle therebetween, and the bending direction is toward one side of the high frequency radiation branch 15 to generate low frequency resonance and additional secondary high frequency resonance. The length ratio of the low frequency radiating first stub 141 and the low frequency radiating second stub 142 is adjusted to obtain a suitable additional high frequency resonance.
The antenna main body 1 may further include: the matching circuit structure 16 is connected between the feed point and the radiator, and is used for adjusting the input impedance of the antenna, so that the antenna obtains better standing wave characteristics. The matching circuit structure 16 may be a packaged matching element connected between the feed point and the radiator, but may also be connected to the antenna main ground 12 or to the parasitic stub 17.
Preferably, the antenna body 1 further comprises a parasitic stub 17. The parasitic stub 17 is an extension of the antenna main ground 12, extends from the inclined high end of the antenna main ground 12, and is connected to the matching circuit structure 16. The parasitic branch 17 can generate extra high-frequency resonance, broaden the high-frequency bandwidth, adjust the coupling effect (inductance-capacitance effect) between the radiator and the antenna main ground 12, and cooperate with the matching circuit structure 16 to change the position and convergence of the antenna on the schmitt chart, and improve the input impedance, standing wave characteristics and the like of the antenna.
The high-frequency radiation branch 15 is a main high-frequency radiation unit, and the high-frequency resonance generated by the high-frequency radiation branch 15 and the secondary high-frequency resonance generated by the high-frequency and low-frequency radiation branch 17 form a high-frequency resonance band together, so that the high-frequency bandwidth of the antenna is widened. The final antenna resonance can be seen in fig. 3, where the bandwidth of less than-9 dB can be seen from 698 mhz to 960 mhz and the high frequency from 1.7 ghz to 2.5 ghz, covering all frequency bands of the existing LTE, enabling it to be used in various countries and regions.
The radiator of the antenna main body 1 and the antenna main ground 12 together form a structure similar to or the same as a structure for vertically placing a half-wave oscillator, so that the antenna obtains larger gain in the horizontal plane, can more effectively receive signals from surrounding base stations, and meets the requirements of a vehicle-mounted antenna system.
Alternatively, referring to fig. 1 and 2, the feed line 19 is a coaxial line, the outer conductor 191 of which is connected to the antenna main ground 12 or the parasitic stub 17, and the inner conductor 192 of which is connected to the feed point. The feed line 19 is fed laterally from the inclined high end of the antenna main ground 12, the lateral direction being the direction between the upper and lower portions of the lateral direction on the first surface.
Preferably, the connection part of the feeder line 19 is fixed by dispensing package or by injection molding package, forming a package part 5. Specifically, the connection of the coaxial line to the feed point and the antenna main ground 12 may be a weld. The coaxial line and the antenna can be wrapped by injection molding on the welding area and the matching circuit structure 16 area, thereby playing roles of fixing welding spots and preventing water.
Fig. 4 and fig. 5 show a comparison of the far field test performance of the LTE antenna for the vehicle-mounted rearview mirror according to the embodiment of the invention and the existing antenna, and it can be seen that the LTE antenna for the vehicle-mounted rearview mirror according to the embodiment of the invention has great advantages in both efficiency and gain.
While the invention has been described in terms of the preferred embodiment, it is not intended to limit the scope of the claims, and any person skilled in the art can make variations and modifications without departing from the spirit and scope of the invention, so that the scope of the invention shall be defined by the claims.
Claims (14)
1. The utility model provides a on-vehicle rear-view mirror LTE antenna which characterized in that includes the antenna main part, the antenna main part includes:
a flexible media substrate for being adhesively mounted within a support frame of a rearview mirror, having a first surface facing away from the support frame;
the antenna is mainly arranged at the lower part of the first surface of the flexible medium substrate, and the upper edge of the antenna is inclined at a certain angle so as to increase the distance between the antenna and the radiator;
a feeder line connected from an inclined high end of the antenna main ground;
the feed point is arranged on the first surface of the flexible medium substrate, is positioned at or close to the inclined high end of the antenna main ground and is connected with the feed line;
and the radiator is arranged at the upper part of the first surface of the flexible medium substrate, is connected with the feed point and is used for signal radiation.
2. The vehicle-mounted rearview mirror LTE antenna of claim 1, further comprising a rearview mirror, the antenna body being mounted by the flexible dielectric substrate attached into a support frame of the rearview mirror.
3. The LTE antenna for a vehicle-mounted rear view mirror according to claim 2, wherein the rear view mirror is a left rear view mirror and a right rear view mirror mounted on a vehicle, and the antenna main body is mounted in each of the left rear view mirror and the right rear view mirror.
4. The LTE antenna of claim 2, wherein the portion of the antenna body provided with the antenna main ground is mounted toward the lower edge of the mirror, and the portion provided with the radiator is mounted toward the upper edge of the mirror.
5. The LTE antenna for the vehicle rearview mirror according to any one of claims 1 to 4, wherein the flexible medium substrate is provided with an antenna positioning hole, and the flexible medium substrate is adhered to the inside of the support frame of the rearview mirror, and the antenna main body is fixed by the antenna fixing post through the antenna positioning hole.
6. The vehicle-mounted rearview mirror LTE antenna of claim 1, wherein the radiator includes:
a radiation extension branch extending upward from the feeder connection portion;
a low frequency radiating stub connected to an extension end of the radiating extension stub for generating a low frequency resonance;
and the high-frequency radiation branches are connected with extension ends of the radiation extension branches to generate high-frequency resonance.
7. The LTE antenna of claim 6 wherein the low frequency radiating branches include a first low frequency radiating branch and a second low frequency radiating branch, the first low frequency radiating branch and the second low frequency radiating branch being interconnected and forming a bend angle therebetween, the bend direction being toward one side of the high frequency radiating branch to create low frequency resonance and additional high frequency resonance.
8. The vehicle-mounted rearview mirror LTE antenna of claim 7 wherein the length ratio of the low frequency radiating first branch and the low frequency radiating second branch is adjusted to obtain a suitable additional high frequency resonance.
9. The vehicle-mounted rearview mirror LTE antenna of claim 1, wherein the antenna body further comprises:
and the matching circuit structure is connected between the feed point and the radiator and is used for adjusting the input impedance of the antenna.
10. The vehicle-mounted rearview mirror LTE antenna of claim 9, wherein the antenna body further comprises:
and the parasitic branches extend from the inclined high end of the antenna main ground and are connected with the matching circuit structure so as to generate additional high-frequency resonance, adjust the coupling effect between the radiator and the antenna main ground and change the position and convergence condition of the antenna on the Schmitt original image by matching with the matching circuit structure.
11. The LTE antenna of claim 1, wherein the feeder is a coaxial line, an outer conductor of the coaxial line is connected to the antenna ground, and an inner conductor of the coaxial line is connected to the feed point.
12. The vehicle mounted rearview mirror LTE antenna of claim 1 or 11, wherein the feed line is laterally accessed from a sloped high end of the antenna main ground.
13. The LTE antenna of claim 11, wherein the connection portion of the feeder line is fixed by dispensing package or by injection molding package.
14. The LTE antenna for vehicle rearview mirror according to any one of claims 1-4, 6-13, wherein the radiator and the antenna ground together form an antenna structure similar or identical to a vertically placed half-wave element, increasing the gain of the antenna in the horizontal plane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610861329.6A CN106252844B (en) | 2016-09-28 | 2016-09-28 | Vehicle-mounted rearview mirror LTE antenna |
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| CN201610861329.6A CN106252844B (en) | 2016-09-28 | 2016-09-28 | Vehicle-mounted rearview mirror LTE antenna |
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| CN106252844A CN106252844A (en) | 2016-12-21 |
| CN106252844B true CN106252844B (en) | 2023-05-16 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180053200A (en) | 2016-11-11 | 2018-05-21 | 삼성전자주식회사 | Beamforming antenna assembly including patterned mirror and side mirror assembly for vehicle including beamforming antenna assembly |
| CN109216942B (en) * | 2018-09-11 | 2023-12-19 | 深圳市信维通信股份有限公司 | 5G millimeter wave mobile terminal antenna system based on metal frame |
| WO2020067253A1 (en) * | 2018-09-28 | 2020-04-02 | 株式会社ヨコオ | In-vehicle antenna device |
| CN109904595A (en) * | 2019-02-27 | 2019-06-18 | 深圳市信维通信股份有限公司 | A kind of metal frame car antenna |
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| CN104733861A (en) * | 2013-12-20 | 2015-06-24 | 深圳富泰宏精密工业有限公司 | Antenna structure and wireless communication device with same |
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| CN101682107A (en) * | 2007-05-10 | 2010-03-24 | 高级汽车天线公司 | Vehicle mirror antenna assembly |
| JP2011121507A (en) * | 2009-12-11 | 2011-06-23 | Tokai Rika Co Ltd | Angle switching device of antenna with built-in vehicle outside mirror |
| CN102403572A (en) * | 2011-12-13 | 2012-04-04 | 华南理工大学 | Wideband double frequency mobile communication base station antenna |
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