WO2018095032A1

WO2018095032A1 - Combined antenna

Info

Publication number: WO2018095032A1
Application number: PCT/CN2017/090634
Authority: WO
Inventors: 孙劲; 何其娟
Original assignee: 歌尔股份有限公司
Priority date: 2016-11-22
Filing date: 2017-06-28
Publication date: 2018-05-31
Also published as: CN106532246B; CN106532246A

Abstract

Disclosed is a combined antenna. The combined antenna comprises an ETC antenna panel and two GPS antenna panels. Each GPS antenna panel is in a U-shaped structure and has a long support arm, a short support arm, and a bottom edge. The two ends of the bottom edge are connected to the long support arm and the short support arm, respectively. The two GPS antenna panels are symmetrically distributed at periphery of the ETC antenna panel in the mode of rotating about the ETC antenna panel. The long support arm of one GPS antenna panel is opposite to the short arm of the other GPS antenna panel. The two short support arms are both provided with a GPS antenna grounding point. One of the GPS antenna panel is provided with a second feeder. The second feeder is close to the GPS antenna grounding point on the GPS antenna panel where the second feeder is located. The ETC antenna panel is provided with a first feeder.

Description

Combined antenna

Technical field

The present invention belongs to the field of antenna technologies, and in particular, to a combined antenna.

Background technique

In recent years, with the gradual development of electronic communication technology, more and more electronic devices are operated through wireless communication, and in order to reduce the volume and quantity of product devices, those skilled in the art try to integrate communication antennas with different functions and frequency bands. Together, to improve the utilization of antennas and equipment.

Taking the highway network and the toll collection system as an example, in order to enable the vehicle to pass through the expressway quickly and without stopping, and to complete the charging, ETC technology is adopted in the field. The technology performs dedicated short-range communication with the vehicle-mounted electronic tag mounted on the windshield of the vehicle and the antenna on the ETC lane of the toll station, and uses the computer networking technology to perform background settlement processing with the bank, thereby achieving the vehicle passing through the road and bridge toll station without stopping and completing. The purpose of payment. At the same time, in the construction of the expressway network, GPS positioning navigation for vehicles has gradually begun to spread. Therefore, the combination of the ETC system and the GPS system of the vehicle is receiving more and more attention, and those skilled in the art have begun to try to combine the two systems and devices. This improvement is an important part of building an intelligent transportation system to achieve functions such as driverless driving and automatic charging.

ETC antennas mostly use microstrip patch antennas. Because microstrip antennas are easy to implement various polarization modes, they are widely used in circularly polarized antenna designs, and the microstrip antennas have strict space requirements. After the ETC antenna is combined with the GPS antenna, the two antennas will affect each other, and the GPS antenna and the ETC antenna are poorly isolated in the GPS band due to the limitation of the overall size of the antenna product.

In order to solve the above technical problem, it is necessary to improve the combination of the ETC and the GPS antenna, thereby reducing the mutual influence between the two antennas.

Summary of the invention

It is an object of the present invention to provide a new technical solution for combining antennas.

According to a first aspect of the present invention, there is provided a combined antenna comprising an ETC antenna board and two GPS antenna boards, the GPS antenna board having a U-shaped structure, the GPS antenna board having a long arm and a short branch An arm and a bottom edge, the two ends of the bottom edge are respectively connected to the long arm and the short arm, and the two GPS antenna boards are distributed on the periphery of the ETC antenna board in a symmetrical manner around the center of the ETC antenna board. A long arm of one GPS antenna board is opposite to a short arm of another GPS antenna board, and two short armes are provided with a GPS antenna grounding point, and one of the GPS antenna boards is provided with a first The second feed is located near the GPS antenna ground point on the GPS antenna board (2) on which it is located, and the ETC antenna board is provided with a first feed.

Optionally, the ETC antenna board is a rectangular board, the ETC antenna board has a chamfer angle at two corners, and the other two corners have a right angle, and the chamfer angle is close to the long arm of the GPS antenna board. The right angle is adjacent to the short arm of the GPS antenna board.

Optionally, a cut angle of the ETC antenna board is near a connecting corner of a long arm and a bottom edge of the GPS antenna board, and a right angle of the ETC antenna board points to a short arm and a bottom edge of the GPS antenna board. The corner of the connection.

Optionally, the GPS antenna ground point is near a right angle of the ETC antenna board.

Optionally, the second feeding is disposed at a connecting corner of the short arm and the bottom edge.

Optionally, the gap between the long arm of one of the GPS antenna plates and the short arm of the other GPS antenna plate is a radiation gap of the ETC antenna plate, and the width of the radiation notch ranges from 3 to 8 mm.

Optionally, the radiation gap includes a first radiation gap close to the second feed and a second radiation gap away from the second feed, the first feed (11) being located on the ETC antenna board away from One side of the second feed is adjacent to the second radiation gap.

Optionally, the gap between the GPS antenna board and the ETC antenna board ranges from 1 to 2 mm.

Optionally, the ETC antenna board is located in the same plane as the GPS antenna board, and the combined antenna includes a bottom board, and the bottom board is located below the ETC antenna board and the GPS antenna board, The ETC antenna board is opposite the central area of the backplane, and the GPS antenna ground point is electrically connected to the backplane.

Optionally, the area of the bottom plate is consistent with the overall area of the ETC antenna board and the GPS antenna board, and the distance between the bottom board and the ETC antenna board and the GPS antenna board ranges from 1 to 4 mm.

Optionally, the GPS antenna has a width ranging from 2.7 to 3.3 mm and a thickness ranging from 0.3 to 0.5 mm.

With the structure of the combined antenna provided by the present invention, the mutual influence between the ETC antenna and the GPS antenna can be reduced.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a top plan view of a combined antenna provided by the present invention;

2 is a side view of a combined antenna provided by the present invention;

3 is a schematic diagram of an S-curve of a combined antenna provided by the present invention.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention unless otherwise specified.

The following description of the at least one exemplary embodiment is merely illustrative and is in no way

Techniques, methods and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but the techniques, methods and apparatus should be considered as part of the specification, where appropriate.

In all examples shown and discussed herein, any specific value should be construed as merely illustrative. Illustrative, not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

The invention provides a combined antenna, which combines an ETC (High Speed Road Electronic Toll Collection) antenna board and a GPS (Global Positioning System) antenna board, and the combined antenna adopts a GPS antenna board to surround the ETC antenna board, including Two GPS antenna boards, the GPS antenna board is symmetric with respect to the center of the ETC antenna board, so that two resonances are generated in the vicinity of the GPS frequency band, thereby achieving the purpose of improving the isolation and reducing the mutual interference between the two antennas.

As shown in FIG. 1, the combined antenna includes an ETC antenna board 1 and two GPS antenna boards 2. The top view structure of the GPS antenna board 2 has a U-shaped structure, and the GPS antenna board 2 has a long arm 21, a short arm 22 and a bottom side 23, and the above three parts are sequentially connected to form a U-shaped structure, wherein the long arm 21 The length is greater than the short arm 22. The GPS antenna board 2 is disposed around the ETC antenna board 1. The gaps of the two GPS antenna boards 2 are oppositely disposed, and the ETC antenna board 1 is surrounded by the center. The two GPS antenna boards 2 are center-symmetrical around the ETC antenna board 1, wherein the long arm 21 of one GPS antenna board 2 is opposite to the short arm 22 of the other GPS antenna board 2, leaving a certain distance. GPS antenna grounding points 24 are provided on the short arms 22 of the two GPS antenna boards 2 to ground the GPS antenna board 2. In particular, of the two GPS antenna boards 2, only one GPS antenna board 2 is provided with a second feed 25, which is configured to provide a signal to the GPS antenna board 2. On the GPS antenna board 2 provided with the second feed 25, the position of the second feed 25 is close to the GPS antenna ground point 24. In addition, a first feed 11 is provided on the ETC antenna board 1 for providing signals to the ETC antenna board 1. The ETC antenna can be a microstrip antenna.

The combined antenna provided by the invention utilizes the rotational symmetry characteristic of the GPS antenna board and the ETC antenna board, so that the GPS antenna board provided with the second feed stimulates another GPS antenna board not provided with the feed as a parasitic unit, thus, in the GPS Two resonances are generated near the frequency band, which can improve the isolation and reduce the interaction between the ETC antenna board and the GPS antenna board. on the other hand, Since there are two GPS antenna boards radiating signals together, the GPS signal gains an intensity gain, and the radiation direction of the GPS antenna is concentrated.

In order to achieve the circular polarization of the ETC antenna board, the interaction between the ETC antenna and the GPS antenna is reduced. Alternatively, as shown in FIG. 1 , the ETC antenna board 1 may have a rectangular plate structure, and according to specific implementation, It can be a rectangular plate or a square plate. In particular, the ETC antenna panel 1 has a chamfered angle 13 at two corners, and the other two corners have a right angle 14, and current flows along the chamfered corner 13 to form a circular polarization effect. The chamfer 13 is adjacent to the long arm 21 of the GPS antenna board 2, and the right angle 14 is closer to the short arm 22 of the GPS antenna board 2. The energy of the radiated signal at the corner 13 of the ETC antenna board is lower, and the energy of the long arm of the GPS antenna board is higher. Through the above structural features, the influence of the ETC antenna board on the long arm of the GPS antenna board is higher. small. The short antenna arm 22 of the GPS antenna board 2 is provided with a GPS antenna grounding point 24, and the signal radiated at the right angle 14 of the ETC antenna board does not affect the grounding of the GPS antenna board 2.

Further, the cutting angle 13 of the ETC antenna board 1 may be close to the connecting corner of the long arm 21 and the bottom side 23 of the GPS antenna board 2, and the right angle 14 of the ETC antenna board 1 is directed to the GPS antenna board 2 The short arm 22 is connected to the bottom edge 23 at a corner. This further optimized combined antenna structure can further isolate the signal between the ETC antenna board 1 and the GPS antenna board 2. Optionally, the GPS antenna ground point 24 is also located near the right angle 14 of the ETC antenna panel 1.

Alternatively, in order to reduce the impedance of the GPS antenna board 2 itself, the second feed may be disposed at a corner of the connection of the short arm 22 and the bottom side 23. The positional relationship between the second feed and the grounding point of the GPS antenna affects the impedance of the antenna board itself. If the impedance is too large, the energy loss of the signal will be caused, and finally the GPS signal intensity radiated by the GPS antenna board is low. FIG. 1 shows the relative positional relationship between the second feed 25 and the GPS antenna ground point 24 in the above embodiment. In other embodiments, the position of the second feed and the GPS antenna ground point can be adjusted according to actual conditions by those skilled in the art.

In particular, the gap between the long arm of one of the combined antenna antennas and the short arm of the other GPS antenna plate constitutes a radiation gap 3 of the ETC antenna plate, preferably forming two radiations Gap 3. The radiation gap 3 is for the ETC antenna board to radiate an ETC signal outward. Figure 1 shows the form of the radiation gap 3 in the case where the GPS antenna board 2 is center-symmetrical. In particular, the two radiation gaps 3 may be a first radiation gap close to the second feed 25 and a second radiation gap away from the second feed 25, respectively. Moreover, the first feed 11 of the ETC antenna board is located on a side of the ETC antenna board remote from the second feed and adjacent to the second radiation gap.

The long arm 21 and the short arm 22 are capable of covering the right angle 14 and the chamfer 13 of the ETC antenna panel 1 to form a radiation shield for these regions of the ETC antenna panel. Thus, the ETC antenna board 1 can radiate the ETC signal only from the straight edge position on both sides through the radiation gap 3 between the long arm 21 and the short arm 22. This configuration controls the radiation direction of the ETC antenna board, improves the axial ratio of the ETC antenna board, and can increase the gain of the ETC antenna board to some extent. In one embodiment of the invention, the gain of the ETC antenna board is increased by 1 dB and the axial ratio is improved by 3 dB.

Optionally, the width of the radiation gap 3 ranges from 3 to 8 mm. Within this range, the radiation gap 3 can better improve the performance of the ETC antenna board. If the radiation gap is too wide, the cut angle 13 of the ETC antenna will be exposed, which may affect the signal radiation direction of the ETC antenna board. If the radiation gap is too small, excessive shielding and shielding will be formed, which may reduce the radiation intensity of the ETC antenna board. In an embodiment of the invention, the width of the radiation gap may be 5 mm. Optionally, the GPS antenna board has a width ranging from 2.7 to 3.3 mm and a thickness ranging from 0.3 to 0.5 mm. For example, in one embodiment of the invention, the GPS antenna plate has a width of 3 mm and a thickness of 0.4 mm. The U-shaped structure length of the GPS antenna board preferably satisfies a quarter of the resonant length.

Preferably, the gap between the GPS antenna board and the ETC antenna board 1 ranges from 1 to 2 mm, for example, the gap between the two antenna boards is 1.5 mm. If the gap between the two antenna boards is too small or too large, it may affect the performance of the antenna board. For example, the effect of shielding radiation is too strong, resulting in a decrease in radiation intensity, or the electromagnetic interference between the antenna boards becomes strong.

Optionally, as shown in FIG. 1, the ETC antenna board 1 and the GPS antenna board 2 are in the same plane. As shown in FIG. 2, the combined antenna may further include a bottom board 4. The bottom plate 4 serves as a grounding point for the combined antenna, which may generally be located below the ETC antenna board 1 and the GPS antenna board 2, as shown in FIG. 2, which is disposed in parallel with the antenna board. The ETC antenna board 1 is opposite to a central area of the bottom board 4, and the GPS antenna ground point 24 is electrically connected to the bottom board 4. The ETC antenna board operates at a frequency range of 5.79 GHz to 5.84 GHz.

Further, the area of the bottom plate may be consistent with the overall area of the ETC antenna board and the GPS antenna board. For example, the bottom board is generally a square plate of 24*24 mm, and the area occupied by the two antenna boards as a whole is consistent with the bottom plate. The spacing between the bottom plate and the ETC antenna plate and the GPS antenna plate can be maintained in the range of 1-4 mm. For example, in one embodiment of the invention, the spacing between the antenna plate and the bottom plate is 2 mm. In other embodiments, the area of the bottom plate is preferably not less than the overall area of the antenna board. In addition, the relative distance between the bottom plate and the two antenna plates can better exert the performance of the antenna plate. However, due to the limitation of the size of the electronic product itself, the distance between the antenna plate and the bottom plate cannot be excessively large. Those skilled in the art can make adjustments according to actual conditions, and the present invention does not limit this.

3 is an S-parameter of an embodiment of the present invention. Curve 50 is an isolation between an ETC antenna board and a GPS antenna board. The isolation is improved from -5 dB to -15 dB for only one GPS antenna, and curve 51 is GPS. The return loss of the antenna board, curve 52 is the return loss of the ETC antenna board coupled in the working band of the GPS antenna board. In this embodiment, two GPS antennas with rotational symmetry are used to generate two resonant frequencies in the GPS band as shown by curve 51, so that the coupled resonant frequency of the ETC antenna plate in the working frequency band of the GPS antenna plate is improved, thereby improving the isolation.

While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A combined antenna, characterized in that the combined antenna comprises an ETC antenna board (1) and two GPS antenna boards (2), the GPS antenna board (2) has a U-shaped structure, and the GPS antenna board (2) has a long arm (21), a short arm (22) and a bottom edge (23), the two ends of the bottom edge (23) are respectively connected to the long arm (21) and the short arm (22), two The GPS antenna board (2) is distributed around the center of the ETC antenna board (1) symmetrically around the center of the ETC antenna board (1), and the long arm (21) of one GPS antenna board (2) and the other A short arm (22) of a GPS antenna board (2) is opposite to each other, and two short arm (22) are provided with a GPS antenna grounding point (24), one of the GPS antenna boards (2) A second feed (25) is disposed thereon, the second feed (25) being located near the GPS antenna ground point (24) on the GPS antenna board (2) on which it is located, the ETC antenna board ( 1) A first feed (11) is provided.
The combined antenna according to claim 1, wherein said ETC antenna plate (1) is a rectangular plate, and the ETC antenna plate (1) has a chamfer angle (13) at two corners, and the other two corners There is a right angle (14) close to the long arm (21) of the GPS antenna board (2), the right angle (14) being close to the short arm of the GPS antenna board (2) (twenty two).
The combined antenna according to claim 1 or 2, characterized in that the chamfer angle (13) of the ETC antenna board (1) is close to the long arm (21) and the bottom side of the GPS antenna board (2) ( At the corner of the connection of 23), the right angle (14) of the ETC antenna board (1) points to the corner of the connection of the short arm (22) and the bottom edge (23) of the GPS antenna board (2).
The combined antenna according to any one of claims 1 to 3, characterized in that the GPS antenna ground point (24) is close to a right angle (14) of the ETC antenna board (1).
A combined antenna according to any one of claims 1 to 4, characterized in that the second feed (25) is arranged at a connecting corner of the short arm (22) and the bottom edge (23).
A combined antenna according to any one of claims 1 to 5, characterized in that the short arm of one of the GPS antenna plates (2) and the short arm of the other GPS antenna plate (2) The gap between (22) is the radiation gap (3) of the ETC antenna board (1), and the width of the radiation gap (3) ranges from 3 to 8 mm.
The combined antenna according to any one of claims 1 to 6, characterized in that the radiation gap (3) comprises a first radiation gap close to the second feed (25) and away from the second feed a second radiation gap of (25), the first feed (11) being located on a side of the ETC antenna board (1) remote from the second feed (25) and adjacent to the second radiation gap.
The combined antenna according to any one of claims 1 to 7, characterized in that the gap between the GPS antenna board (2) and the ETC antenna board (1) ranges from 1 to 2 mm.
The combined antenna according to any one of claims 1-8, characterized in that the ETC antenna board (1) is located in the same plane as the GPS antenna board (2), and the combined antenna comprises a bottom plate (4). The bottom plate (4) is located below the ETC antenna board (1) and the GPS antenna board (2), the ETC antenna board (1) is opposite to a central area of the bottom board (4), and the GPS antenna grounding point (24) electrically connected to the bottom plate (4).
The combined antenna according to any one of claims 1-9, characterized in that the area of the bottom plate (4) coincides with the overall area of the ETC antenna board (1) and the GPS antenna board (2), the bottom board ( 4) The distance between the ETC antenna board (1) and the GPS antenna board (2) ranges from 1 to 4 mm.