CN114171902B

CN114171902B - Antenna device and electronic equipment

Info

Publication number: CN114171902B
Application number: CN202111403078.4A
Authority: CN
Inventors: 廖建兴
Original assignee: Queclink Wireless Solutions Co Ltd
Current assignee: Queclink Wireless Solutions Co Ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2024-02-20
Anticipated expiration: 2041-11-24
Also published as: CN114171902A

Abstract

The application provides an antenna device and electronic equipment, the antenna device is used for being installed on a shell of the electronic equipment, a main board far away from the antenna device is arranged in the shell, the antenna device comprises a radiation unit, a tuning unit and a matching unit, the radiation unit is connected with the tuning unit through a feed spot welding disc, the tuning unit is connected with the matching unit, and at least two short-circuit point bonding pads are arranged in the matching unit; the antenna device further comprises a coaxial line, wherein the coaxial line is connected with the feed point welding disc and one of the short circuit point welding discs, a first end of the coaxial line is connected with the feed point welding disc, and a second end of the coaxial line is used for being connected with the main board. The antenna device of the electronic equipment is connected with the main board of the electronic equipment through the coaxial line, namely, the antenna device can be independently arranged outside the main board of the electronic equipment, and the installation position of the antenna device is flexible, so that the antenna device can be adapted to more electronic equipment, and the size of the electronic equipment is reduced.

Description

Antenna device and electronic equipment

Technical Field

The present disclosure relates to the field of communications, and in particular, to an antenna device and an electronic device.

Background

An antenna is a transducer that converts a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space) or vice versa. The electronic equipment can realize the functions of mobile communication, global positioning, local area network connection, point-to-point communication and the like through the antenna device.

In the related art, the antenna device is generally integrated on a motherboard of the electronic device, and the size of the antenna device needs to be set in cooperation with the housing of the electronic device. The metal parts and the PCBA (the PCB blank board is subjected to SMT mounting or whole manufacturing process of DIP plug-in) in the electronic equipment can affect the parameters of the antenna device, so that in order to ensure that the antenna device has good performance, the antenna device needs to make corresponding structural changes when being mounted on different electronic equipment, that is, the existing antenna device cannot be commonly used on different electronic equipment, the existing antenna device is not beneficial to reducing the size of a main board in the electronic equipment, and is not beneficial to miniaturization of the electronic equipment.

Disclosure of Invention

In order to overcome the above-mentioned drawbacks of the related art, an object of the present application is to provide an antenna device and an electronic device, where the antenna device can be adapted to more electronic devices, and is beneficial to reduce the volume of the electronic device.

An embodiment of the present application provides an antenna device, configured to be mounted on a housing of an electronic device, where a motherboard far away from the antenna device is disposed in the housing, the antenna device includes a radiation unit, a tuning unit, and a matching unit, where the radiation unit is connected to the tuning unit through a feed-spot welding disc, the tuning unit is connected to the matching unit, and at least two short-circuit point pads are disposed in the matching unit;

The antenna device further comprises a coaxial line, wherein the coaxial line is connected with the feed point bonding pad and one of the short circuit point bonding pads, a first end of the coaxial line is connected with the feed point bonding pad, and a second end of the coaxial line is used for being connected with the main board.

In the antenna device as described above, optionally, the tuning unit is connected to the matching unit through one of the short-circuit point pads.

In the antenna device as described above, optionally, a first shorting point pad and a second shorting point pad are disposed in the matching unit, the first shorting point pad is disposed on a side of the matching unit, which is close to the tuning unit, and the tuning unit is connected to the first shorting point pad.

In the above antenna device, optionally, in the first direction, the first shorting point pad and the second shorting point pad are located on the same line.

In the above antenna device, optionally, in the first direction, the first shorting point pad and the second shorting point pad are located on two sides of the feed point pad, respectively.

In the antenna device as described above, optionally, a perpendicular bisector of a line connecting the first shorting pad and the second shorting pad passes through the feed point pad.

The antenna device as described above, optionally, the radiating element includes a first radiating section, a first transition section, a second radiating section, a second transition section, and a third radiating section, where the first radiating section, the second radiating section, and the third radiating section are all disposed along a first direction; the first transition section is connected with the second end of the first radiation section and the second end of the second radiation section, the second transition section is connected with the first end of the second radiation section and the first end of the third radiation section, and the second end of the third radiation section is connected with the feed point bonding pad;

the tuning unit comprises a first tuning section, a second tuning section and a third transition section, wherein the third transition section is connected with the second end of the first tuning section and the second end of the second tuning section, the first end of the first tuning section is connected with the feed point bonding pad, and the first end of the second tuning section is connected with the first short-circuit point bonding pad.

The antenna device as described above, optionally, the first transition section, the second transition section and the third transition section are all disposed along a second direction; or in a plane including the first direction and the second direction, the first transition section, the second transition section and the third transition section are all arc-shaped.

In the antenna device as described above, optionally, the matching unit has a rectangular shape in a plane including the first direction and the second direction.

As described above, optionally, the coaxial line includes a first metal layer, a first insulating layer, a second metal layer, and a second insulating layer coaxially disposed, where the first insulating layer is sleeved outside the first metal layer, the second metal layer is sleeved outside the first insulating layer, and the second insulating layer is sleeved outside the second metal layer;

the first metal layer is connected with the feed point bonding pads, and the second metal layer is connected with one of the short circuit point bonding pads.

An antenna device as described above, optionally, the length of the antenna device is a quarter of the wavelength of the radio signal, the voltage standing wave ratio of the antenna device in the operating frequency range is less than 2, and the return loss of the antenna device in the operating frequency range is less than-10 dB.

The antenna device as described above, optionally, further comprises a substrate, wherein a copper foil layer is disposed on the substrate, and an ink layer is further disposed on the copper foil layer.

The antenna device as described above, optionally, the substrate comprises a hard substrate or a flexible substrate.

Another embodiment of the present application provides an electronic device, including a housing, the internal surface of housing is equipped with the antenna device as described above, still be equipped with the mainboard in the housing, be equipped with antenna matching element and connect on the mainboard antenna matching element's radio frequency walks the line, antenna device's coaxial line connection the radio frequency walks the line.

As described above, optionally, the main board is provided with an IPEX male socket, and the IPEX male socket is connected with the radio frequency wiring; and the coaxial line is connected with an IPEX female seat, and the coaxial line and the radio frequency wiring are connected through the IPEX male seat and the IPEX female seat in a clamping manner.

As described above, optionally, the motherboard is provided with a radio frequency pad and a radio frequency grounding pad, and the radio frequency pad is connected with the radio frequency wiring; the first metal layer of the coaxial line is welded and fixed with the radio frequency bonding pad, and the second metal layer of the coaxial line is welded and fixed with the radio frequency grounding bonding pad;

or, the shell is provided with a buckle, and the antenna device is clamped and fixed on the shell; alternatively, the antenna device comprises a flexible substrate, and the antenna device is adhered and fixed on the shell;

Or the antenna device is arranged on a metal plate, and the metal plate is fixedly connected with the shell; alternatively, the antenna device is engraved on the housing.

In the electronic device as described above, optionally, the antenna device is perpendicular to the main board, wherein the radiating unit is located on a side of the antenna device facing away from the main board, and the matching unit is located on a side of the antenna device facing toward the main board.

In the electronic device, optionally, a plurality of metal pieces are disposed on the main board, and the antenna device is disposed away from the metal pieces.

The application provides an antenna device and electronic equipment, the antenna device is used for being installed on a shell of the electronic equipment, a main board far away from the antenna device is arranged in the shell, the antenna device comprises a radiation unit, a tuning unit and a matching unit, the radiation unit is connected with the tuning unit through a feed spot welding disc, the tuning unit is connected with the matching unit, and at least two short-circuit point bonding pads are arranged in the matching unit; the antenna device further comprises a coaxial line, wherein the coaxial line is connected with the feed point welding disc and one of the short circuit point welding discs, a first end of the coaxial line is connected with the feed point welding disc, and a second end of the coaxial line is used for being connected with the main board. Through above-mentioned scheme, antenna device accessible coaxial line of this application is connected with electronic equipment's mainboard, and antenna device can be independent of electronic equipment's mainboard and set up alone outward promptly for antenna device's mounted position is nimble for antenna device can adapt more electronic equipment, and is favorable to reducing electronic equipment's volume. In addition, as the antenna device is provided with the plurality of short-circuit point bonding pads, the coaxial lines can be connected to the different short-circuit point bonding pads after the antenna device is installed in different electronic equipment so as to debug the performance of the antenna device, so that the antenna device has good performance parameters in different electronic equipment.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the following description will briefly describe the drawings that are required to be used in the embodiments or the related technical descriptions, and it is obvious that, in the following description, the drawings are some embodiments of the present application, and other drawings may be obtained according to these drawings without any inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an antenna device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of an antenna device according to another embodiment of the present application;

fig. 3 is a cross-sectional view of an antenna device according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an electronic device according to another embodiment of the present application;

fig. 6 is a schematic diagram of a connection structure between a coaxial line and a motherboard in an electronic device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a vehicle recorder according to an embodiment of the present application;

fig. 8 is a voltage standing wave ratio test diagram of an antenna device according to an embodiment of the present disclosure;

fig. 9 is a return loss test diagram of an antenna device according to an embodiment of the present disclosure;

Fig. 10 is a 2D direction diagram of an X-plane of an antenna device according to an embodiment of the present application when resonance frequencies are 2.400GHz, 2.450GHz, and 2.485GHz, respectively;

FIG. 11 is a 2D diagram of a Y-plane of an antenna device according to an embodiment of the present disclosure when the resonant frequencies are 2.400GHz, 2.450GHz, and 2.485GHz, respectively;

fig. 12 is a 2D directional diagram of a Z-plane of an antenna device according to an embodiment of the present application when the resonant frequencies are 2.400GHz, 2.450GHz, and 2.485GHz, respectively;

fig. 13 is a schematic structural diagram of an antenna device according to still another embodiment of the present application.

Reference numerals:

5-an antenna device;

1-a radiating element; 61-a first radiation section; 62-a second radiation section; 63-a third radiation section;

a 2-tuning unit;

a 3-matching unit; 55-a first shorting point pad; 6-a second shorting point pad;

4-a feed point bonding pad; 64-a first tuning section; 65-a second tuning section;

32-coaxial line; 7-a first metal layer; 8-a second metal layer;

23-a substrate; a 22-copper foil layer; 21-an ink layer;

11-an electronic device; 30-a housing; 39-a motherboard; 66-an antenna matching element; 34-IPEX male seat; 42-IPEX female seat; a 35-memory chip; 36-a low voltage power supply assembly; 37-portal connector; 38-a power supply terminal; 40-a radio frequency module;

68-a first radio frequency trace; 69-a second radio frequency trace; 300-a third radio frequency trace; 301-a radio frequency bonding pad; 302-copper foil; 303-via holes; 304-a radio frequency ground pad; 316-fourth radio frequency trace;

31-a first clasp; 41-a second catch;

100-horn cavity; 123-horn; 125-lens mount; 117-an image sensor; 126-horn magnetic section; 102-a microphone; 88-a bracket;

x-a first direction; y-second direction.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments.

All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure. The following embodiments and features of the embodiments may be combined with each other without conflict.

In view of this, the application aims at providing an antenna device and electronic equipment, through installing antenna device on electronic equipment's casing to utilize the coaxial line to be connected antenna device and electronic equipment's mainboard, make antenna device can independent from electronic equipment's mainboard outside alone setting, antenna device's mounted position is nimble, can adapt more electronic equipment, and is favorable to reducing electronic equipment's volume.

The following detailed description of embodiments of the present application will be presented in conjunction with the accompanying drawings to enable one skilled in the art to more fully understand the present application.

Fig. 1 is a schematic diagram of an antenna device according to an embodiment of the present disclosure; fig. 2 is a schematic structural diagram of an antenna device according to another embodiment of the present application; fig. 13 is a schematic structural diagram of an antenna device according to still another embodiment of the present application.

Referring to fig. 1, 2 and 13, the present embodiment provides an antenna device 5 for being mounted on a housing of an electronic apparatus, wherein a motherboard far from the antenna device 5 is disposed in the housing. The antenna device 5 comprises a radiation unit 1, a tuning unit 2 and a matching unit 3, wherein the radiation unit 1 is connected with the tuning unit 2 through a feed-spot welding disk 4, the tuning unit 2 is connected with the matching unit 3, and at least two short-circuit point bonding pads are arranged in the matching unit 3. The antenna arrangement 5 further comprises a coaxial line 32 (i.e. an antenna cable), the coaxial line 32 being connected to the feed pad 4 and one of the short-circuit pads, wherein a first end of the coaxial line 32 is connected to the feed pad 4 and a second end of the coaxial line 32 is for connection to the main board.

The antenna device 5 of the present embodiment is not on the motherboard of the electronic device, and the antenna device 5 is connected to the ground point on the motherboard through the coaxial line 32, thereby realizing normal communication. In this embodiment, a displacement current is generated between the radiation unit 1 and the matching unit 3 of the antenna device 5, that is, a pulsed electric field is generated between the radiation unit 1 and the matching unit 3, a pulsed magnetic field is generated by the pulsed electric field, a pulsed electric field is generated by the pulsed magnetic field, and so on, alternating electromagnetic field energy is generated, so that a radio frequency signal is radiated from the air in a radio wave manner.

The specific number of the short-circuit point bonding pads in the matching unit 3 can be set according to the needs, for example, the number of the short-circuit point bonding pads can be 2, 3, 4 and the like; when the coaxial line 32 is connected to different shorting pads, the impedance of the antenna device 5 is different, and after the antenna device 5 is installed in the electronic apparatus, relevant parameters such as bandwidth, gain, etc. of the antenna device 5 can be brought to an ideal state by connecting different shorting pads. That is, in different electronic devices, according to the space inside the electronic device, the coaxial line 32 of the antenna device 5 is connected to different short-circuit point pads, so as to adjust the Voltage Standing Wave Ratio (VSWR) and return loss (S11) of the antenna device 5, so that the antenna device 5 achieves the best performance, and meets the design requirements of different electronic devices, and the antenna device 5 of the embodiment has a larger application range.

The antenna device 5 of the embodiment may be connected with the motherboard of the electronic device through the coaxial line 32, that is, the antenna device 5 may be separately set independently of the motherboard of the electronic device, and the installation position of the antenna device 5 is flexible, so that the antenna device 5 can adapt to more electronic devices, and is beneficial to reducing the volume of the electronic device. In addition, since the antenna device 5 is provided with a plurality of short-circuit point bonding pads, the coaxial line 32 can be connected to different short-circuit point bonding pads after the antenna device 5 is installed in different electronic equipment to debug the performance of the antenna device 5, so that the antenna device 5 has good performance parameters in different electronic equipment.

With continued reference to fig. 1 and 2, in one embodiment, the tuning unit 2 is connected to the matching unit 3 by one of the shorting pads.

Specifically, the matching unit 3 of the present embodiment is provided with a first shorting pad 55 and a second shorting pad 6, where the first shorting pad 55 is disposed on a side of the matching unit 3 close to the tuning unit 2, and the tuning unit 2 is connected to the first shorting pad 55.

Alternatively, as shown in fig. 1, in the first direction X, the first shorting point pad 55 and the second shorting point pad 6 may be located on the same line; that is, the first and second shorting pads 55 and 6 may be positioned at the same horizontal position.

In other possible embodiments, as shown in fig. 2, the first shorting point pad 55 and the second shorting point pad 6 may not be on the same line in the first direction X; that is, the first shorting pad 55 and the second shorting pad 6 may not be at the same horizontal position.

Further, in the first direction X, the first shorting pad 55 and the second shorting pad 6 are located on both sides of the feed spot pad 4, respectively. That is, the connection lines between the first shorting pad 55, the second shorting pad 6, and the feed-spot pad 4 form a triangle.

Further, a perpendicular bisector of the line between the first shorting pad 55 and the second shorting pad 6 passes through the feed-spot pad 4; that is, in the first direction X, the first shorting pad 55 and the second shorting pad 6 are distributed in central symmetry with respect to the feed spot pad 4.

In one possible implementation, the radiation unit 1 of the present embodiment includes a first radiation section 61, a first transition section a, a second radiation section 62, a second transition section B, and a third radiation section 63, wherein the first radiation section 61, the second radiation section 62, and the third radiation section 63 are all disposed along a first direction X; the first transition section a is connected to the second end of the first radiation section 61 and the second end of the second radiation section 62, the second transition section B is connected to the first end of the second radiation section 62 and the first end of the third radiation section 63, and the second end of the third radiation section 63 is connected to the feed spot welding 4.

Specifically, as shown in fig. 1 and 2, a first radiation section61 and the second radiation section 62 are each L3 in length, and the first end of the third radiation section 63 is aligned with the first end of the first radiation section 61 in the second direction Y (wherein the first direction X and the second direction Y are perpendicular to each other). The length of the first radiation section 61 in the second direction Y is w1, and the length of the second radiation section 62 in the second direction Y is w2; w1 may be equal to w2, or may be unequal, and may be specifically set as required. A gap w8 is formed between the first radiation section 61 and the second radiation section 62, and a gap w9 is formed between the second radiation section 62 and the third radiation section 63. The length of the first transition section A in the first direction X is w5, and the length of the second transition section B in the first direction X is w6. Optionally, in a plane including the first direction X and the second direction Y, the first transition section a and the second transition section B are both disposed along the second direction Y, that is, the first transition section a and the second transition section B are both straight. The first radiation section 61, the first transition section A and the second radiation section 62 together form a singleThe second radiation section 62, the second transition section B and the third radiation section 63 together form a +.>By means of the above-described solution, the space of the radiating element 1 can be compressed as much as possible, so as to save the size of the antenna device 5. Furthermore, in other possible embodiments, the first transition section a and the second transition section B are each arc-shaped in a plane including the first direction X and the second direction Y. That is, the first radiation section 61, the first transition section A and the second radiation section 62 together form a +. >The second radiation section 62, the second transition section B and the third radiation section 63 together form a +.>This arrangement also allows the space of the radiating element 1 to be compressed, saving on the size of the antenna device 5.

The tuning unit 2 includes a first tuning section 64, a second tuning section 65, and a third transition section C, the third transition section C being connected to the second end of the first tuning section 64 and the second end of the second tuning section 65, the first end of the first tuning section 64 being connected to the feed spot pad 4, the first end of the second tuning section 65 being connected to the first short-circuit point pad 55.

With continued reference to fig. 1 and 2, the second ends of the first tuning sections 64 and 65 are aligned with the second ends of the first radiating sections 61 in the second direction Y, the lengths of the third radiating sections 63 and the first tuning sections 64 in the second direction Y are w3, and the lengths of the second tuning sections 65 in the second direction Y are w4. Optionally, in a plane comprising the first direction X and the second direction Y, the third transition section C is arranged along the second direction Y, i.e. the third transition section C is straight. The first tuning section 64, the second tuning section 65 and the third transition section C together form oneBy means of the above-described solution, the space of the tuning unit 2 can be compressed as much as possible, so as to save the size of the antenna device 5. Furthermore, in other possible embodiments, the third transition section C is arc-shaped in a plane comprising the first direction X and the second direction Y. The first tuning section 64, the second tuning section 65 and the third transition section C together form a +. >This arrangement also allows the space of the tuning unit 2 to be compressed, saving on the size of the antenna device 5.

The matching unit 3 has a rectangular shape in a plane including the first direction X and the second direction Y.

The first side of the matching unit 3 in the first direction X is aligned with the first end of the first radiating section 61 in the second direction Y and the second side of the matching unit 3 in the first direction X is connected to the second tuning section 65 through the first shorting pad 55. The first shorting pad 55 is disposed at a side of the matching unit 3 near the tuning unit 2 in the second direction Y. The second shorting point pad 6 may be disposed at an arbitrary position of the matching unit 3.

In one embodiment, the coaxial line 32 of the present embodiment includes a first metal layer 7, a first insulating layer, a second metal layer 8 and a second insulating layer coaxially disposed, where the first insulating layer is sleeved outside the first metal layer 7, the second metal layer 8 is sleeved outside the first insulating layer, and the second insulating layer is sleeved outside the second metal layer 8; wherein the first metal layer 7 is connected to the feed-spot pad 4 and the second metal layer 8 is connected to one of the short-circuit pads.

Alternatively, the impedance of the coaxial line 32 of this embodiment is 50 ohms or 75 ohms. Generally, the rf modules of mobile 2G, LTE G, mobile 5G, wifi, zigbee, bluetooth, etc. are all 50 ohms, and 75 ohms are commonly used in the tv tuner module. The coaxial line of 50 ohms or 75 ohms is selected according to the specific situation of the radio frequency module in the main board. Meanwhile, the impedance of the antenna device 5 needs to be selected to be 50 ohms or 75 ohms according to the specific situation of the radio frequency module in the main board.

The present embodiment can adjust the impedance of the antenna device 5 and further adjust the relevant parameters of the antenna device 5 by:

the method comprises the following steps: as shown in fig. 1, when the first metal layer 7 of the coaxial line 32 is connected to the feed-spot pad 4 and the second metal layer 8 of the coaxial line 32 is connected to the first shorting pad 55, the distance between the feed-spot pad 4 and the first shorting pad 55 or the second shorting pad 6 determines the length of the tuning unit 2. The distance between the feed point pad 4 and the first shorting point pad 55 is composed of a length L30 above the tuning unit 2, a corner length L31 of the tuning unit 2, and a length L32 below the tuning unit 2, that is, the distance between the feed point pad 4 and the first shorting point pad 55=l30+l31+l32; the distance between the feed point pad 4 and the second shorting point pad 6 is composed of the length L30 above the tuning unit 2, the length L31 of the third transition section C, the length L32 below the tuning unit 2, and the length L4 above the matching unit 3, that is, the distance between the feed point pad 4 and the second shorting point pad 6=l30+l31+l32+l4. Adjusting the length of the tuning unit 2 can adjust the impedance of the antenna device 5, so that the impedance can freely adjust the matching degree (i.e. the coupling amount) of the antenna impedance to be varied between the upper and lower critical values (e.g. 50 ohms or 75 ohms) of the characteristic impedance. That is, adjusting the length of the tuning unit 2 can be directly used to adjust the performance of the VSWR and S11 of the antenna device 5. VSWR <2, S11< -10dB is allowed within a bandwidth range specified by the resonance frequency of the antenna device 5. Taking the coaxial line 32 connected with the first short-circuit point pad 55 as an example, when the impedance of the antenna device 5 is larger, the impedance of the antenna device 5 can be reduced by pulling the distance between the feed-back spot welding disk 4 and the first short-circuit point pad 55, so that the characteristic impedance of the antenna device reaches a critical value; when the impedance of the antenna device 5 is small, the impedance of the antenna device 5 can be increased by increasing the distance between the feed spot pad 4 and the first shorting pad 55 so that the characteristic impedance thereof reaches a critical value (e.g., 50 ohms or 75 ohms).

As shown in fig. 2, the second shorting point pad 6 and the first shorting point pad 55 in fig. 2 are not on the same horizontal line in the first direction X, and the distance between the feeding point pad 4 and the second shorting point pad 6 is formed by the length L30 above the tuning unit 2, the length L31 of the third transition section C, the length L32 below the tuning unit 2, and the linear distance L400 between the second shorting point pad 6 and the first shorting point pad 55 in the matching unit 3, that is, the distance between the feeding point pad 4 and the second shorting point pad 6=l30+l31+l32+l400. The other structures and the adjustment manners of the impedance of the antenna device 5 in this embodiment are the same as those in fig. 1, and are not described here again.

The second method is as follows: when the first metal layer 7 of the coaxial line 32 is connected to the feed-spot pad 4 and the second metal layer 8 of the coaxial line 32 is connected to the second shorting pad 6, the impedance of the antenna device 5 can be increased to bring the characteristic impedance to a critical value because the second shorting pad 6 is farther from the feed-spot pad 4 than the first shorting pad 55. The impedance of the antenna device 5 can be adjusted by adjusting the position of the second shorting pad 6 on the matching unit 3, so that the impedance can be freely adjusted to change the matching degree of the antenna impedance between the upper and lower critical values of the characteristic impedance. Adjusting the length of the tuning unit 2 can be directly used to adjust the VSWR and S11 performance of the antenna, letting VSWR <2, S11< -10dB over a bandwidth specified by the resonant frequency of the antenna arrangement 5.

That is, adjusting the connection position of the second metal layer 8 of the coaxial line 32 and the first shorting pad 55 or the second shorting pad 6 can indirectly affect the resonant frequency of the antenna device 5.

And a third method: the shape and size of the matching unit 3 can be adjusted as well, which can be used directly to adjust the performance of the antenna device 5.

Taking a Wifi antenna with the antenna device 5 being 2.4GHz as an example, the parameters of the antenna device 5 are adjusted by the 3 methods, so that the antenna device 5 is as close to 50 ohms as possible, the VSWR values of the antenna device 5 in three frequency bands of 2412MHz, 2450MHz and 2484MHz are all smaller than 2.0, and the S11 of the antenna device 5 in three frequency bands of 2412MHz, 2450MHz and 2484MHz is all smaller than-10 dB. The deeper the waveform of S11, the higher the efficiency and the better the performance of the antenna device 5.

The length of the antenna device 5 in this embodiment is one quarter of the wavelength of the radio signal, the voltage standing wave ratio of the antenna device 5 is less than 2, and the return loss of the antenna device 5 is less than-10 dB, so as to ensure that the antenna device 5 has better performance parameters.

When the length of the antenna device 5 is 1/4 of the wavelength of the radio signal, the transmission and reception conversion efficiency of the antenna device 5 is highest, the resonance state of the antenna device 5 can be adjusted, and the antenna device 5 can be easily matched with the coaxial line 32. The length of the antenna device 5 will therefore be determined according to the frequency, i.e. the wavelength, of the transmitted and received signals. The wavelength of the corresponding radio signal can be calculated as long as the center frequency of the corresponding transmission and reception is known, and dividing the calculated wavelength by 4 is the optimal length of the corresponding antenna device 5. Wherein, the conversion formula of frequency and wavelength is: wavelength=30 kilometers/frequency= 300000000 meters/frequency. In particular, in the present embodiment, as shown in fig. 1, when the coaxial line 32 is connected to the first shorting pad 55, the resonant length of the antenna device 5 is: length of radiating element 1 + length of tuning element 2 = 1/4 wavelength; as shown in fig. 2, when the coaxial line 32 is connected to the second short-circuit point pad 6, the resonant length of the antenna device 5 is: length of radiating element 1 + length of tuning element 2 + length of shorting point pad 6 to tuning element 2 = 1/4 wavelength. The length of the radiating element 1 is adjusted to directly influence the resonance point of the antenna device 5, that is, the length of the radiating element 1 has the most obvious influence on the resonance frequency of the antenna device 5.

In this embodiment, the first metal layer 7 of the coaxial line 32 is connected to the feed-spot pad 4, and the first shorting pad 55 or the second shorting pad 6 is connected to the second metal layer 8 of the coaxial line 32, so that other positions of the antenna device 5 except the feed-spot pad 4, the first shorting pad 55 and the second shorting pad 6 are exposed to copper need to be covered with an insulating layer on the surface to prevent oxidation and corrosion of the copper foil on the antenna device 5 due to contact with air.

Fig. 3 is a cross-sectional view of an antenna device according to an embodiment of the present application. Referring to fig. 3, specifically, along the perpendicular direction of the plane formed by the first direction X and the second direction Y, the antenna device 5 of the present embodiment includes a substrate 23, a patterned copper foil layer 22 is disposed on the substrate 23, and an ink layer 21 is further disposed on the copper foil layer 22, that is, the radiation unit 1, the tuning unit 2 and the matching unit 3 of the antenna device 5 are all composed of the substrate 23, the patterned copper foil layer 22 disposed on the substrate 23, and the ink layer 21 covered on the copper foil layer 22.

The substrate 23 is made of an insulating material, and the material selection affects the loss tangent of the antenna device 5, and the larger the loss tangent is, the larger the loss is, which means that the bandwidth of the antenna device 5 becomes correspondingly larger, the radiation efficiency decreases, the gain decreases, and the bandwidth becomes wider. Alternatively, the substrate 23 of the present embodiment may be a hard substrate or a flexible substrate, such as a glass epoxy substrate (having a dielectric constant Dk of 3.8 to 4.5, generally having a Dk of 4.2), a teflon substrate (having a dielectric constant Dk of 2.6), a ceramic substrate (having a dielectric constant Dk of 10.0), an epoxy substrate (including CEM1 substrate and CEM3 substrate), or a phenolic tissue laminate substrate (including FR1 substrate, FR2 substrate and FR3 substrate).

Fig. 13 is a schematic structural diagram of an antenna device according to still another embodiment of the present application. In comparison with fig. 1, the first shorting pad 55 in fig. 1 is connected at the junction between the tuning unit 2 and the matching unit 3, i.e. the tuning unit 2 is connected to the matching unit 3 via the first shorting pad 55. Whereas the first shorting pad 55 in fig. 13 is provided in the matching unit 3 and is connected directly to the matching unit 3 below the tuning unit 2 in the X direction, i.e. the tuning unit 2, the first shorting pad 55 is not connected at the junction between the tuning unit 2 and the matching unit 3. Other parameter settings in fig. 13 are the same as those in fig. 1, and will not be described again here.

Through the above arrangement, the antenna device 5 can be connected with the main board of the electronic device through the coaxial line 32, that is, the antenna device 5 can be independently arranged outside the main board of the electronic device, and the installation position of the antenna device 5 is flexible, so that the antenna device 5 can be adapted to more electronic devices, and the size of the electronic device can be reduced.

Further, compared with the structure shown in fig. 1, the arrangement position of the first shorting pad 55 in the present embodiment is more flexible.

FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the present application; fig. 5 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

Referring to fig. 4-5, the embodiment further provides an electronic device 11, which includes a housing 30, the inner surface of the housing 30 is provided with the antenna device 5 as described above, a main board 39 is further disposed in the housing 30, an antenna matching element 66 and a radio frequency trace connected to the antenna matching element 66 are disposed on the main board 39, and a coaxial line 32 of the antenna device 5 is connected to the radio frequency trace.

Specifically, the antenna device 5 is disposed on the inner side of the housing 30 of the electronic device 11, the housing 30 is further provided with a main board 39, the main board 39 is provided with a power terminal 38, a network port connector 37, a low-voltage power component 36, a memory chip 35, a radio frequency module 40 and an antenna matching element 66, the main board 39 is provided with the antenna matching element 66 and a radio frequency trace connected with the antenna matching element 66, and the coaxial line 32 of the antenna device 5 is connected with the radio frequency trace.

In one embodiment, as shown in fig. 4 and 5, the main board 39 is provided with an IPEX male socket 34, and the IPEX male socket 34 is connected to a radio frequency wiring; specifically, the main board 39 is provided with a first radio frequency wire 68 and a second radio frequency wire 69, the first radio frequency wire 68 is connected with the IPEX male socket 34 and the antenna matching element 66, and the second radio frequency wire 69 is connected with the antenna matching element 66 and the radio frequency module 40. The coaxial line 32 is connected with the IPEX female socket 42, and the coaxial line 32 and the radio frequency wiring are connected by clamping the IPEX male socket 34 and the IPEX female socket 42. In the above manner, the communication connection between the radio frequency module 40 and the antenna device 5 is realized.

Fig. 6 is a schematic diagram of a connection structure between a coaxial line and a motherboard in an electronic device according to an embodiment of the present application. Referring to fig. 6, in another possible embodiment, a radio frequency pad 301 and a radio frequency grounding pad 304 are disposed on the motherboard 39, and the radio frequency pad 301 is connected to the third radio frequency trace 300; the first metal layer 7 of the coaxial line 32 is welded to the radio frequency pad 301, and the second metal layer 8 of the coaxial line 32 is welded to the radio frequency ground pad 304.

Specifically, the third rf trace 300 is connected to the rf pad 301 and the antenna matching element 66, and the antenna matching element 66 is connected to the fourth rf trace 316. The third rf trace 300 and the rf pad 301 are covered with a ground copper foil 302, and a via 303 is formed on the ground copper foil 302 near the third rf trace 300 and the rf pad 301 (for preventing rf leakage and increasing rf signal isolation). By adopting the scheme, the IPEX female seat 42 on the coaxial line 32 and the IPEX male seat 34 on the main board are saved, the cost is further reduced, and meanwhile, the impedance jump change is small and the connection is more reliable in the transmission process of the radio frequency signal.

Optionally, a buckle is provided on the housing 30, and the antenna device 5 is fastened and fixed on the housing 30.

As shown in fig. 4, in the present embodiment, the antenna device 5 is disposed on a hard substrate, the housing 30 is provided with a first buckle 31 and a second buckle 41 that are disposed opposite to each other, and two ends of the antenna device 5 are fixed on the housing 30 through the first buckle 31 and the second buckle 41, respectively. By adopting the scheme, the installation method of the antenna device 5 is simple and reliable, and the cost is low.

In other possible embodiments, the antenna device 5 comprises a flexible substrate 23, and the antenna device 5 is adhesively fixed to the housing 30.

As shown in fig. 5, in this embodiment, the antenna device 5 is directly attached to the inner wall of the housing 30, and no buckle is provided on the inner wall of the housing 30. The flexible substrate 23 is made of soft material, can be bent and deformed, is coated with adhesive on one surface of the flexible substrate 23, can be randomly adhered to the inner wall of the casing 30 with radian, and is flexible and changeable in structure, small in space limitation and wide in application range.

Alternatively, the antenna device 5 is perpendicular to the main board 39, wherein the radiating element 1 is located on the side of the antenna device 5 facing away from the main board 39, and the matching element 3 is located on the side of the antenna device 5 facing towards the main board 39.

Optionally, a plurality of metal pieces are provided on the main board 39, and the antenna device 5 is disposed away from the metal pieces.

The metal piece includes a main board 39, a power terminal 38, a network port connector 37, a low-voltage power supply assembly 36, a memory chip 35, a radio frequency module 40 and the like, and the antenna device 5 is arranged far away from the metal piece, so that the performances of various parameters such as a pattern, gain, sensitivity and the like of the antenna device 5 are better.

In the above embodiment, the parts of the electronic device 11 near the antenna device 5 are generally white or transparent, so that the performance of the antenna device 5 is advantageously improved.

Alternatively, the antenna device 5 is provided on a metal plate, which is fixedly connected with the housing 30; alternatively, the antenna device 5 is engraved on the housing 30.

When the antenna device 5 is connected to the housing 30 via the substrate, the pattern of the antenna device 5 may be designed to have a metal plate with a certain thickness (for example, thickness ∈0.1 mm), and the coaxial line 32 may be soldered to the feed pad 4, the first shorting pad 55, or the second shorting pad 6 of the antenna device 5 without supporting the substrate. During assembly, the antenna device 5 is directly embedded in the housing 30 or other insulating material on the electronic device 11, and the other end of the coaxial line 32 leads to the main board 39 and is connected with the radio frequency signal of the radio frequency module. The surface of the antenna device 5 may be coated with an insulating material or a plated metal material (e.g., nickel plating) to prevent oxidation of the antenna device 5 when exposed to air.

Alternatively, the pattern of the antenna device 5 may be engraved on an insulating material (for example, the case 30) of the electronic apparatus 11 by an LDS (Laser Direct-structuring) method, and the LDS antenna may be manufactured. The feed pad 4, the first shorting pad 55 or the second shorting pad 6 of the LDS antenna soldered the coaxial line 32. The other end of the coaxial line 32 leads to the rf module when assembled.

The gain (G) and bandwidth (B) of the antenna device 5 are both proportional to the volume (V), so that the bandwidth can be widened by increasing the volume of the antenna device 5 without reducing the gain of the antenna. The distance of the near field sensing region of the antenna device from the surrounding metallic pieces also affects the volume of the antenna device. Therefore, a larger space must be reserved near the antenna device 5, and no metal piece can be provided, so as to meet the radiation space requirement of the near-field induction area of the antenna device. The whole structure (for example, the placement position of the antenna device 5, the space distance between the metal piece and the antenna device 5), stacking and the like have a certain range of influence on the impedance, bandwidth and gain of the antenna device 5.

In order to prove the design rationality and practicality of the antenna device 5 in the above embodiment of the present application, taking fig. 2 as an example, the antenna device 5 is a Wifi antenna, and the antenna device 5 is an FPC (flexible circuit board, flexible Printed Circuit) antenna in the present embodiment, and is applied to a vehicle recorder. Fig. 7 is a schematic structural diagram of a vehicle recorder with a Wifi antenna as the antenna device 5 in the embodiment of the application.

As shown in fig. 7, the housing 30 of the automobile data recorder is rectangular, the antenna device 5 (in this embodiment, FPC antenna) is adhered to the right inner side of the top of the housing 30, a horn sound cavity 100 is disposed on the left side of the housing 30, a horn 123 is disposed in the horn sound cavity 100, the horn 123 is perpendicular to the antenna device 5, and the horn 123 is far away from the antenna device 5, so as to reduce interference of a pulse magnetic field generated by the operation of the horn 123 on the antenna device 5. A lens holder 125 is disposed at the center of the housing 30, and an image sensor 117 is disposed at the center of the lens holder 125, wherein the image sensor 117 is far away from the antenna device 5, so as to reduce mutual interference between the image sensor 117 and the antenna device 5. A microphone cavity is also provided in the housing 30, and is connected to the microphone 102 for picking up sound. The microphone 102 is remote from the antenna arrangement 5 to reduce interference of the microphone 102 by the high frequency pulsed electromagnetic field generated by the antenna arrangement 5. The carrier 88 of the tachograph is intended to be fixedly suspended from the vehicle windscreen.

The overall machine and the relevant size of the internal structure of the automobile data recorder are as follows:

the height H7 of the whole machine is 92mm, and the width L8 of the whole machine is 50mm; the height H6 of the housing 30 is 46mm. The horn 123 includes a horn magnetic portion 126 (including a magnet and a coil), the horn magnetic portion has an edge distance L6 (vertical direction) from the antenna device 5 of 18mm, and an edge distance H4 (horizontal direction) from the horn magnetic portion 126 to the antenna device 5 of 13.8mm; the edge distance H3 (vertical direction) between the microphone 102 and the antenna device 5 is 32mm; the edge distance H3 (horizontal) between the microphone 102 and the speaker cavity is 31.5mm.

The parameters of the antenna device 5 are as follows:

length of the first radiating section 61 = 16.0mm;

the length of the second radiating section 62 = 16.0mm;

the length of the third radiation section 63 = 6.67mm;

length of tuning unit 2 = 16.4mm;

the width w11=11.8 mm and the length h3=12.0 mm of the matching unit 3;

the gap w8=0.2 mm between the first radiation section 61 and the second radiation section 62;

the gap w9=0.3 mm between the second radiation section 62 and the third radiation section 63;

the gap w10=0.2 mm between the third radiating section 63 and the tuning unit 2 and the matching unit 3;

the width w1=1.0 mm of the first radiation section 61;

the width w2=1.33 mm of the second radiating section 62;

The width w3=1.33 mm of the third radiating section 63 and the first tuning section;

the width w4=1.33 mm of the second tuning section 65;

the width w5=3.0 mm of the first transition section a;

the width w6=3.0 mm of the second transition section B;

the width w7=2.0 mm of the third transition section C.

The test data obtained after the connection of the antenna device 5 are shown in table 1, and table 1 shows main technical parameters of the antenna device 5 when the running recorder is applied. As can be seen from Table 1, the resonance frequency of the antenna device 5 was in the range of 2.400GHz to 2.500GHz, the bandwidth was 100MHz, the average gain of the antenna device 5 was 1.35dBi, and the characteristic impedance was maintained at 50 ohms and VSWR was not more than 1.91. For general wireless products, VSWR is less than or equal to 2.0, but the automobile data recorder belongs to a broadband product (the antenna device 5 needs to transmit high-definition video signals and audio signals), and the index requirement on the antenna is high, so that the VSWR is less than or equal to 1.91.

Table 1 main technical parameters of antenna device 5 in driving recording applications

The testing and analysis process of the antenna device 5 is described in detail below.

The test environment of the antenna device 5 in this embodiment includes an OTA darkroom and a network analyzer. The polarization of the antenna device 5 is horizontal.

Fig. 8 is a voltage standing wave ratio test diagram of the antenna device 5 according to an embodiment of the present application. From fig. 8, it can be derived that: when the resonant frequency of the antenna device 5 is 2.400GHz, VSWR is 1.4441 (where point a in fig. 8 is located); when the resonance frequency of the antenna is 2.450GHz, the VSWR is 1.3423 (the position of the point b in fig. 8), and when the resonance frequency of the antenna is 2.50GHz, the VSWR is 1.5435 (the position of the point c in fig. 8), that is, the VSWR is <2 in the bandwidth range of 100MHz where the antenna device 5 works, so that the bandwidth design requirement of the antenna device 5 for transmitting high-definition video signals and audio signals by the automobile data recorder (belonging to broadband products) is completely met.

Fig. 9 is a return loss test diagram of the antenna device 5 according to an embodiment of the present application. From fig. 9, it can be derived that: s11 is-16.770 dB (where point d in fig. 9 is located) when the resonant frequency of the antenna device 5 is 2.400 GHz; when the resonant frequency of the antenna device 5 is 2.450GHz, S11 is-19.435 dB (where the point e in fig. 9 is located); when the resonant frequency of the antenna device 5 is 2.500GHz, S11 is-13.636 dB (where the f point in fig. 9 is located); that is, in the bandwidth range of 100MHz where the antenna device 5 works, S11<10dB completely meets the design requirement of the antenna device 5 bandwidth for the high-definition video signal and the audio signal transmitted by the automobile data recorder.

Table 2 gives the efficiency and gain of the antenna arrangement 5 in the tachograph at 3 different resonance frequencies. As can be seen from table 2, when the resonance frequency of the antenna device 5 is 2.400GHz, the antenna efficiency is 58.31% and the gain is 0.76dB; when the resonant frequency of the antenna device 5 is 2.450GHz, the antenna efficiency is 59.50% and the gain is 1.36dB; when the resonance frequency of the antenna device 5 is 2.500GHz, the antenna efficiency is 60.62% and the gain is 2.02dB; although the antenna device 5 is in horizontal polarization, all test data of the whole automobile data recorder meets the design requirement of the automobile data recorder.

Table 2 efficiency and gain of antenna device 5 in automobile data recorder at 3 different resonant frequencies

Resonant frequency	Efficiency of	Gain of
			2.400GHz	58.31％	0.76dB
2.450GHz	59.50％	1.36dB
			2.500GHz	60.62％	2.02dB

Fig. 10 is a 2D direction diagram of an X-plane of the antenna device 5 provided in an embodiment of the present application when the resonant frequencies are 2.400GHz, 2.450GHz, and 2.485GHz, wherein three curves A, B, C are respectively the 2D direction diagrams of the antenna device 5 when the resonant frequencies are 2.450GHz, 2.400GHz, and 2.485 GHz. Fig. 10 is a 2D direction diagram of an antenna device 5 obtained when the automobile data recorder is horizontally placed and the X-plane is the side of the automobile data recorder, and it can be seen from fig. 10 that when the 2D direction diagram of the X-plane is at the center position of 275 ° and the included angle is within ±10°, the radiation performance of 2.400GHz, 2.450GHz and 2.485GHz is best, the radiation performance is good in the range of 0 ° to 210 ° (clockwise), the radiation dead angle appears in the range of ±15° at the center position of 177 °), the position is the position of a metal part in the automobile data recorder, the induction near field of the antenna device 5 can be absorbed or reflected when encountering the metal part in the automobile data recorder, and the radiation dead angle appears in a certain direction of the direction diagram. In addition, 2D patterns of three frequency bands of 2.400GHz, 2.450GHz and 2.485GHz tend to be basically consistent on the X plane.

Fig. 11 is a 2D direction diagram of a Y plane of the antenna device 5 provided in an embodiment of the present application when the resonant frequencies are 2.400GHz, 2.450GHz, and 2.485GHz, wherein three curves A, B, C are respectively the 2D direction diagrams of the resonant frequencies of the antenna device 5 are 2.450GHz, 2.400GHz, and 2.485GHz on the Y plane. Fig. 11 is a horizontal placement of the automobile data recorder, and the Y-plane is a 2D direction diagram of the antenna device 5 obtained at the top of the automobile data recorder, as can be seen from fig. 11: 2.400GHz (curve B in FIG. 11) Y-plane 2D pattern the best 2.400GHz radiation performance was obtained at a center position of 85.1 deg. with an included angle in the range of + -5.2 deg.. 2.450GHz (curve A in FIG. 11) Y-plane 2D pattern is best for radiation performance at 2.450GHz at 106℃center and angles in the range of + -24.9 ℃.2.485GHz (curve C in FIG. 11) Y-plane 2D pattern the 2.450GHz radiation performance is best at 106℃center and included angles in the range of + -14.9 ℃. The three frequency bands of 2.400GHz, 2.450GHz and 2.485GHz show good radiation performance in the range of 161-331 DEG (anticlockwise direction) in the Y-plane 2D direction diagram.

Fig. 12 is a 2D directional diagram of a Z-plane of the antenna device 5 according to an embodiment of the present application when the resonant frequencies are 2.400GHz, 2.450GHz, and 2.485GHz, respectively; the A, B, C three curves are respectively 2D directional diagrams of the resonant frequencies of the antenna device 5 in the Z plane, wherein the resonant frequencies are 2.450GHz, 2.400GHz and 2.485 GHz. Fig. 12 is a 2D direction diagram of the antenna device 5 obtained from the top of the automobile data recorder, and as can be seen from fig. 12, the Z-plane is the horizontal placement of the automobile data recorder: the 2.400GHz (curve B in FIG. 12) Z-plane 2D pattern provides the best 2.400GHz radiation performance at 274 deg. center and angles in the + -4.9 deg.. 2.450GHz (curve A in FIG. 12) Y-plane 2D pattern is best for radiation performance at 2.450GHz with 264 center and included angles in the range of + -24.9.

2.485GHz (curve C in FIG. 12) Y-plane 2D pattern the best 2.450GHz radiation performance was obtained at 264.9 center and included angles in the range of + -14.9. The three frequency bands of 2.400GHz, 2.450GHz and 2.485GHz show good radiation performance in the range of 15.1-251 DEG (anticlockwise direction) in the Y-plane 2D direction diagram.

According to the test, the 2D directional patterns of the antenna device 5 in the three frequency bands of 2.400GHz, 2.450GHz and 2.485GHz meet the strict requirements of the automobile data recorder on the directional patterns of the antenna device 5 on the X-plane, the Y-plane and the Z-plane.

Further, table 3 shows the active test data transmitted by the antenna device 5 at 3 different frequencies of high, middle and low, TRP mode (Total Radiated Power, radiation performance emission parameter) and 1M/s bandwidth of the read data.

TABLE 3 Wifi emission active test data of complete machine under the TRP mode with 1M/s bandwidth of complete machine read data

Table 4 shows the active test data of the antenna device 5 receiving sensitivity under the conditions that the read data of the whole machine is 1M/s bandwidth, TIS mode (Total Isotropic Sensitivity, radiation performance receiving parameter), and 3 different frequencies of high, middle and low.

TABLE 4 Wifi receiving sensitivity active test data of complete machine under the TRP mode with 1M/s bandwidth as the complete machine read data

Table 5 shows the active test data transmitted by the antenna device 5 at 3 different frequencies of high, medium and low with read data of 11M/s bandwidth, TRP mode.

TABLE 5 complete machine read data is 11M/s bandwidth, TRP mode, complete machine Wifi emission active test data

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Table 6 shows the active test data of the antenna device 5 receiving sensitivity under the conditions that the read data of the whole machine is 11M/s bandwidth, TIS mode and 3 different frequencies of high, medium and low.

TABLE 6 Wifi reception sensitivity active test data of complete machine under the TRP mode with complete machine read data of 11M/s bandwidth

From tables 3 and 5, three frequency bands of 2412MHz, 2437MHz and 2462MHz are selected for testing, and the Wifi high-middle-low frequency band is covered, so that the conduction and emission performance of the Wifi module and the radiation performance of the antenna of the automobile data recorder in the bandwidth range of 2.400 GHz-2.500 GHz of Wifi operation can be basically reflected. Taking 2462MHz (11 channels of Wifi) as an example, in TRP mode, the read data is 1M/s bandwidth and 11M/s bandwidth, the minimum transmission power is 2.71dBm, the maximum transmission power is-0.39 dBm, and the effective value of the transmission power is 0.38dBm; that is, the influence on the transmitting power of the whole machine is smaller when the read data is 1M/s bandwidth and 11M/s bandwidth, the performance of the antenna device 5 radiation is smaller when the read data is 1M/s bandwidth and 11M/s bandwidth, and the test data meets the design requirement of the automobile data recorder.

Taking 1M/s bandwidth as an example of the read data, in the TIS mode, the difference of the minimum transmitting power among three frequency bands of 2412MHz, 2437MHz and 2462MHz is maintained at 0.7 dBm-3.25 dBm, the difference of the receiving transmitting power is maintained at 0.03 dBm-2.43 dBm, and the effective value of the transmitting power is 0.22 dBm-2.2 dBm. The antenna device 5 is in the TIS mode, the influence on the consistency of the transmitting power of the whole vehicle is small in the bandwidth range of 2.400 GHz-2.500 GHz in the Wifi operation, and the side surface shows that the antenna device 5 is good in the consistency of the transmitting power in the bandwidth range of 2.400 GHz-2.500 GHz, so that the design requirement of an automobile data recorder is met.

From tables 4 and 6, three frequency bands of 2412MHz, 2437MHz and 2462MHz are selected for testing, and the Wifi high-middle-low frequency band is covered, so that the performance of the Wifi module conduction receiving sensitivity and the performance of the antenna receiving sensitivity of the automobile data recorder in the bandwidth range of 2.400 GHz-2.500 GHz of Wifi operation can be basically reflected. Taking 2437MHz (6 channels of Wifi) as an example, in a TIS mode, the read data is 1M/s bandwidth and 11M/s bandwidth, the minimum receiving sensitivity is different by 1.09dBm, the maximum receiving sensitivity is different by 5.69dBm, that is, the influence on the receiving sensitivity of the whole machine when the read data is 1M/s bandwidth and 11M/s bandwidth is smaller, and the side surface also shows that the performance of the receiving sensitivity of the antenna device 5 is smaller on the difference of the read data is 1M/s bandwidth and 11M/s bandwidth, so that the design requirement of an automobile data recorder is met.

Taking the bandwidth of 1M/s as an example of the read data, in the TRP mode, the difference of the minimum receiving sensitivity among three frequency bands of 2412MHz, 2437MHz and 2462MHz is maintained at 0.36 dBm-2.04 dBm, the difference of the maximum receiving sensitivity is maintained at 0.26 dBm-1.32 dBm, and the effective value of the receiving sensitivity is maintained at 0.07 dBm-1.07 dBm. The antenna device 5 is in the TRP mode, the influence on the consistency of the receiving sensitivity of the whole vehicle is small in the bandwidth range of 2.400 GHz-2.500 GHz in the Wifi operation, and the side surface shows that the antenna device 5 is good in consistency of the receiving sensitivity in the bandwidth range of 2.400 GHz-2.500 GHz, so that the design requirement of an automobile data recorder is met.

As is clear from the above test data, the antenna device 5 of the present embodiment has excellent performance, and the design of the antenna device is reasonable, so that the antenna device 5 has high practicality.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in the description of the present application, the terms "first," "second," and the like are merely used for convenience in describing the various components and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In this application, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are only needed to see each other.

In the description of the present application, descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this application, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The antenna device is characterized by being arranged on a shell of electronic equipment, wherein a main board far away from the antenna device is arranged in the shell, the antenna device comprises a radiation unit, a tuning unit and a matching unit, the radiation unit is connected with the tuning unit through a feed spot welding disc, the tuning unit is connected with the matching unit, and at least two short-circuit point bonding pads are arranged in the matching unit;

the antenna device further comprises a coaxial line, wherein the coaxial line is connected with the feed point bonding pad and one of the short circuit point bonding pads, a first end of the coaxial line is connected with the feed point bonding pad, and a second end of the coaxial line is used for being connected with the main board;

the coaxial line comprises a first metal layer, a first insulating layer, a second metal layer and a second insulating layer which are coaxially arranged, wherein the first insulating layer is sleeved on the outer side of the first metal layer, the second metal layer is sleeved on the outer side of the first insulating layer, and the second insulating layer is sleeved on the outer side of the second metal layer; the first metal layer is connected with the feed point bonding pads, and the second metal layer is connected with one of the short circuit point bonding pads.

2. The antenna device according to claim 1, wherein the tuning unit is connected to the matching unit through one of the shorting pads.

3. The antenna device according to claim 2, wherein a first shorting point pad and a second shorting point pad are provided in the matching unit, the first shorting point pad is provided at a side of the matching unit close to the tuning unit, and the tuning unit is connected to the first shorting point pad.

4. An antenna arrangement according to claim 3, characterized in that in a first direction the first and second shorting pads are located on the same line.

5. The antenna device of claim 4, wherein in a first direction, the first shorting point pad and the second shorting point pad are located on either side of the feed point pad, respectively.

6. The antenna device of claim 5, wherein a perpendicular bisector of a line between the first shorting pad and the second shorting pad passes through the feed spot pad.

7. The antenna device according to any one of claims 3-6, wherein the radiating element comprises a first radiating section, a first transition section, a second radiating section, a second transition section, and a third radiating section, wherein the first radiating section, the second radiating section, and the third radiating section are each disposed along a first direction; the first transition section is connected with the second end of the first radiation section and the second end of the second radiation section, the second transition section is connected with the first end of the second radiation section and the first end of the third radiation section, and the second end of the third radiation section is connected with the feed point bonding pad;

8. The antenna assembly of claim 7 wherein the first transition, the second transition, and the third transition are each disposed along a second direction; or in a plane including the first direction and the second direction, the first transition section, the second transition section and the third transition section are all arc-shaped.

9. The antenna device according to claim 8, wherein the matching unit has a rectangular shape in a plane including the first direction and the second direction.

10. The antenna device according to claim 1, wherein the coaxial line comprises a first metal layer, a first insulating layer, a second metal layer and a second insulating layer coaxially arranged, wherein the first insulating layer is sleeved outside the first metal layer, the second metal layer is sleeved outside the first insulating layer, and the second insulating layer is sleeved outside the second metal layer;

11. The antenna device according to claim 1, characterized in that the length of the antenna device is a quarter of the wavelength of the radio signal, the voltage standing wave ratio of the antenna device in the operating frequency range is smaller than 2, and the return loss of the antenna device in the operating frequency range is smaller than-10 dB.

12. An electronic device, characterized by comprising a housing, wherein an antenna device according to any one of claims 1-11 is arranged on the inner surface of the housing, a main board is further arranged in the housing, an antenna matching element and a radio frequency wiring connected with the antenna matching element are arranged on the main board, and a coaxial line of the antenna device is connected with the radio frequency wiring.

13. The electronic device of claim 12, wherein an IPEX male socket is provided on the motherboard, the IPEX male socket being connected to the radio frequency trace; and the coaxial line is connected with an IPEX female seat, and the coaxial line and the radio frequency wiring are connected through the IPEX male seat and the IPEX female seat in a clamping manner.

14. The electronic device of claim 12, wherein a radio frequency pad and a radio frequency ground pad are disposed on the motherboard, the radio frequency pad being connected to the radio frequency trace; the first metal layer of the coaxial line is welded and fixed with the radio frequency bonding pad, and the second metal layer of the coaxial line is welded and fixed with the radio frequency grounding bonding pad;

15. The electronic device of claim 14, wherein the antenna arrangement is perpendicular to the motherboard, wherein the radiating element is located on a side of the antenna arrangement facing away from the motherboard, and wherein the matching element is located on a side of the antenna arrangement facing toward the motherboard.

16. The electronic device of claim 15, wherein a plurality of metal pieces are provided on the motherboard, and the antenna arrangement is disposed away from the metal pieces.