CN208209007U - Slot antenna suitable for mobile unit - Google Patents

Abstract

The utility model relates to antenna technology, and specifically discloses a slot antenna suitable for vehicle-mounted equipment, comprising: a conductive shell and a printed circuit board, the printed circuit board is attached to the inner wall of the conductive shell, and the conductive shell is provided with a penetrating In the gap between the inner and outer walls, the printed circuit board is provided with a slot located in the gap; among them, the printed circuit board is also provided with a feed point and a ground point, and the feed point and the ground point are arranged on both sides of the slot symmetrically . By opening a very narrow slit on the conductive shell, the antenna and the conductive shell are directly designed together, which improves the problem that the antenna cannot effectively receive and transmit signals in the prior art, thereby greatly improving the performance of the antenna. Its structural design Simple, easy to disassemble, and low cost, they are ideal for in-vehicle applications.

Description

Slot Antennas Suitable for Vehicle Equipment

technical field

The utility model relates to antenna technology, in particular to a slot antenna suitable for vehicle-mounted equipment.

Background technique

The in-vehicle infotainment system is an Internet service based on the body bus system, which integrates communication methods such as Bluetooth, WiFi and 4G, and provides functions such as assisted driving and online entertainment for drivers and passengers. The realization of the above functions is based on the communication between the vehicle and the outside world, which is the only hardware foundation of this communication lifeline, the antenna.

The car antenna system, also known as the car transceiver system, converts the electromagnetic signal in the space into an electrical signal through the antenna, and then adjusts the signal strength by the amplifier, and then transfers it to the car infotainment system for decoding and processing through the coaxial cable.

In the prior art, the antenna carrying the wireless communication function is mostly built in the main box with a metal shell, and the radio frequency signal can pass through by opening holes in the metal shell.

However, in the above methods: 1) Due to the influence of the Faraday cage principle, the metal shell induces charges or currents due to the electric field, thereby isolating the electric field and electromagnetic wave interference inside and outside the metal shell, especially for high-frequency signals. The performance of the antenna is greatly reduced; 2) opening holes in the metal shell will have a greater impact on the performance of the electromagnetic compatibility (EMC) in the main box; 3) it is also not conducive to the structural design of the vehicle entertainment device.

Utility model content

Aiming at the problems existing in the prior art, the utility model solves the problem of providing a slot antenna suitable for vehicle-mounted equipment. After opening a very narrow gap on the conductive shell, the antenna and the conductive shell are directly designed on the Together, thereby improving the performance of the antenna in the vehicle communication equipment.

The utility model provides a slot antenna suitable for vehicle equipment, comprising:

A conductive housing and a printed circuit board, the printed circuit board is attached to the inner wall of the conductive housing, the conductive housing is provided with a gap passing through the inner and outer walls, and the printed circuit board is provided with a Slots inside; where,

The printed circuit board is also provided with a feed point and a ground point, and the feed point and the ground point are arranged on both sides of the slot symmetrically.

Compared with the prior art, the above scheme has the following beneficial technical effects:

1) Since the main radiation position of the antenna is directly in front of it, the problem that the antenna cannot effectively receive signals in the prior art is improved by placing the printed circuit board with the antenna feed point close to the gap inside the conductive housing, Thereby greatly improving the antenna performance;

2) The antenna structure design is simple and low cost, which is very suitable for vehicle applications;

3) The conductive housing and the printed circuit board are detachably connected, which is beneficial for later maintenance.

Description of drawings

In order to illustrate the embodiments of the utility model or the technical solutions in the prior art more clearly, a brief introduction will be given below to the drawings required for the description of the embodiments or the prior art. Other details and advantages of the present invention will become apparent from the detailed description provided hereinafter. For those skilled in the art, on the basis of not paying creative work, other drawings can also be obtained according to the drawings of the embodiments described in the utility model.

Fig. 1 is a schematic diagram of a conductive housing of the utility model suitable for a slot antenna of a vehicle-mounted device;

Fig. 2 is a schematic diagram of an embodiment of the slot antenna suitable for vehicle-mounted equipment of the present invention;

Fig. 3 is a schematic diagram of the internal structure of a conductive housing of the utility model suitable for the slot antenna of the vehicle-mounted device;

Fig. 4 is a schematic structural diagram of a printed circuit board of the slot antenna suitable for vehicle-mounted equipment of the present invention;

Fig. 5 is a schematic cross-sectional view of a slot antenna suitable for vehicle-mounted equipment of the present invention;

Fig. 6 is a schematic diagram of another embodiment of the slot antenna suitable for vehicle-mounted equipment of the present invention;

Fig. 7 is a schematic diagram of a rear view of another embodiment of the slot antenna suitable for vehicle-mounted equipment of the present invention.

The content shown in the above drawings is only for example and illustration, and is not drawn strictly according to scale, nor does it completely draw all the components or details related to the specific use environment. Those skilled in the art, after understanding the principles and concepts of the utility model, will be able to think of related technical content known in the art that needs to be added to implement the utility model in a specific use environment.

Detailed ways

In describing the present invention, it should be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

The technical solution of the utility model will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

Since most vehicle-mounted communication devices are made of metal shells, the internal antennas are easily affected by the metal shell or nearby metal parts, which will affect the output strength of their signals. Setting the slot antenna can reduce the resulting impact. For example, setting it on a detachable printed circuit board (Printed Circuit Board, PCB) will be more effective than directly setting the slot antenna on the metal casing. It is beneficial to product design and later maintenance, and the manufacturing cost is lower.

According to an embodiment of the present invention, referring to Fig. 1, Fig. 2 and Fig. 3, it is a schematic diagram of the implementation of the slot antenna suitable for vehicle-mounted equipment, a schematic diagram of the front view, and a schematic diagram of the internal structure of the conductive housing. Wherein, FIG. 2 is a view from outside to inside of the conductive housing. One side of the conductive housing 100 is provided with a gap 110 of a linear closed-loop structure, and its interior is close to the printed circuit board 200, and the interior of the printed circuit board 200 is provided with a gap corresponding to the gap 110 and slightly smaller than the gap 110. The slot 210 is completely embedded in the gap 110 . Those skilled in the art should understand that "gap" refers to a long and narrow space that is cracked or naturally exposed. In this embodiment, it runs through the inner and outer walls of the conductive housing 100, while "groove" refers to a gap that is raised on both sides and concave in the middle. Therefore, in this embodiment, the slot 210 does not penetrate through the printed circuit board 200 .

When connecting, the side of the printed circuit board 200 with the slot 210 faces the gap 110 of the conductive casing 100 , so that the slot 210 is completely located in the gap 110 , and the conductive casing 100 and the printed circuit board 200 are connected by bolts. In the printed circuit board, with the slot 210 as the center, a feed point 221 and a ground point 222 corresponding to the feed point 221 are arranged axially symmetrically on both sides of the slot 210. The feed point 221 and the ground point 222 are located at Within the range of the gap 110 of the conductive housing 100 , the feeding point 221 is connected to the printed circuit board of the host through a feeding line. When in use, the printed circuit board 200 is arranged inside the conductive housing 100, and the feed point 221 provided on the printed circuit board 200 is connected to the host printed circuit board inside the conductive housing 100 through the coaxial cable 300 (not shown). shown) connection. In the embodiment of the present invention, the printed circuit board 200 is directly attached to the gap 110 of the conductive housing 100 , so the structural design of the inner space of the conductive housing 100 will not be affected.

It should be noted that the positions of the feeding point 221 and the grounding point 222 can be interchanged, as long as they exist at the same time and are located on the same side of the printed circuit board. The feeding point 221 and the grounding point 222 can be set at any position between the two ends limited by the length of the slot 210 , as long as the relative positions of the two from the slot 210 are symmetrical.

Specifically, the conductive case 100 may be a conductive case made of conductive resin, or a conductive case in which metal is deposited on a surface of a dielectric material such as plastic resin, or a conductive case made of only metal.

Specifically, in the embodiment of the present utility model, the slot 210 is a thin, narrow, linear closed-loop structure, located in the gap 110 of the conductive housing 100, and there is a certain distance between the slot 210 and the gap 110 . In terms of signal reception, the length and width of the slot 210 mainly affect the working frequency band and bandwidth of the antenna, which will affect the strength of the signal. It is set according to the requirements and actual conditions of the vehicle-mounted communication equipment and conductive housing.

In the embodiment of the present invention, by adjusting the positions of the feeding point and the grounding point in the printed circuit board, the characteristic impedance of the antenna can be adjusted to achieve a good matching state. Since it usually needs to match the characteristic impedance of 50 ohms, the feeding position is usually deviated from the center of the slot 210 and moves toward the edge, so that the characteristic impedance gradually decreases. In this embodiment, by adjusting the positions of the feeding point 221 and the grounding point 222 relative to the slot 210 until they are close to 50 ohms, the optimal setting positions of the feeding point and the grounding point are obtained.

Specifically, as shown in FIG. 3, the feeder is a coaxial cable 300, which is not directly connected to the conductive housing 100, but connects the inner core wire of the coaxial cable to the feeder provided on the printed circuit board 200. The point 221 is connected, and the outer conductor of the coaxial cable 300 is connected to the ground point 222 provided on the printed circuit board 200 . Generally speaking, the size of the grounding point is larger than that of the feeding point, and the copper plate on its surface is used as the grounding of the coaxial cable 300 .

Referring to Fig. 4, it is a schematic structural diagram of a printed circuit board suitable for the slot antenna of the vehicle equipment according to the present invention, the printed circuit board 200 also includes a metal coating 230, which is arranged on the peripheral edge of the printed circuit board 200, the The size of the coating should just cover the overlapping portion of the printed circuit board 200 and the conductive housing 100 , and may also be slightly larger than the overlapping portion. The metal coating 230 provided on the printed circuit board 200 can utilize the good electrical conductivity of the metal to better increase the strength of the antenna signal.

According to another embodiment of the present utility model, as shown in FIG. 5 , the embodiment of the present utility model also includes a conductive via 240 for connecting the printed wires between the upper and lower layers of the printed circuit board 200 . Simple and low cost, since the conductive via technology is an existing technology, so it will not be described here.

As shown in FIG. 6 and FIG. 7 , it is a schematic diagram and a rear view schematic diagram of another embodiment of the slot antenna suitable for vehicle-mounted equipment of the present invention. FIG. 6 is a view from outside to inside of the conductive housing, and FIG. 7 is a view from inside to outside of the conductive housing. The printed circuit boards shown in FIG. 6 and FIG. 7 are opposite sides of each other. In consideration of the convenience of installation, different from the above-mentioned embodiments, the feeding point 221 and the grounding point 222 are arranged on the side of the printed circuit board 200 facing the printed circuit board (not shown) of the host inside the conductive housing 100, so as to avoid The inconvenience of passing through the conductive housing 100 when the coaxial cable 300 is connected to the feed point 221 is eliminated, which is beneficial to installation and the overall appearance of the conductive housing 100 . Therefore, in this embodiment, conductive via holes are provided at the positions of the feed point 221 and the ground point 222 that are arranged symmetrically with the slot 210 as the central axis on the side of the printed circuit board 200 that has the slot 210 in the previous embodiments. 240, so that the feeding point 221 and the grounding point 222 are led to the same position as the opposite side of the printed circuit board 200 with the slot 210, and without affecting the antenna signal, for the conductive housing 100 as a whole, More beautiful and convenient.

It can be understood that the above-mentioned embodiments of the present invention can be combined with each other to obtain more embodiments under the condition of no conflict. The various specific technical features described in the above specific implementation manners may be combined in any suitable manner if there is no contradiction.

Although the utility model has been disclosed above with preferred embodiments, the utility model is not limited thereto. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present utility model should be included in the protection scope of the present utility model, so the protection scope of the present utility model should be defined by the claims range prevails.

Claims (6)

1. A slot antenna for a vehicle-mounted device, comprising:

the conductive shell is provided with a gap penetrating through the inner wall and the outer wall, and the printed circuit board is provided with a slot positioned in the gap; wherein,

the printed circuit board is further provided with a feeding point and a grounding point, and the feeding point and the grounding point are arranged on two sides of the slot in an axisymmetric mode.

2. The slot antenna for the vehicle-mounted device according to claim 1, characterized in that: the printed circuit board is also provided with a conductive through hole, and the feed point and the grounding point are led to the corresponding position of the back surface of the slot through the conductive through hole.

3. The slot antenna for the vehicle-mounted device according to claim 1, characterized in that: the printed circuit board further comprises a metal coating, and the metal coating at least comprises a part of the printed circuit board attached to the conductive shell.

4. The slot antenna for the vehicle-mounted device according to claim 1, characterized in that: the feeding point and the grounding point are adjustably arranged at any position between two ends of the slot on two sides of the slot.

5. The slot antenna for the vehicle-mounted device according to claim 1, characterized in that: the gap and the slot are of a closed loop structure.

6. The slot antenna for the vehicle-mounted device according to claim 1, characterized in that: the gap and the slot are linear structures.