CN113131181B - Terminal Equipment - Google Patents
Terminal Equipment Download PDFInfo
- Publication number
- CN113131181B CN113131181B CN201911396236.0A CN201911396236A CN113131181B CN 113131181 B CN113131181 B CN 113131181B CN 201911396236 A CN201911396236 A CN 201911396236A CN 113131181 B CN113131181 B CN 113131181B
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- antenna
- terminal device
- terminal equipment
- monopole
- main board
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- 230000005404 monopole Effects 0.000 claims description 43
- 230000003071 parasitic effect Effects 0.000 claims description 40
- 230000005284 excitation Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
Abstract
The application provides a terminal device, which comprises an antenna, wherein the terminal device is provided with a first system and a second system; the antenna is in a balanced mode state of the operating frequency band of the first system and the operating frequency band of the second system. The influence of the user holding on the antenna performance is realized by changing the distributed current of the main board of the terminal equipment, and the distributed current of the main board is reduced by the balanced mode state of the antenna, so that the influence on the receiving and transmitting signals of the terminal equipment can be reduced when the user holds the terminal equipment.
Description
Technical Field
The application relates to the technical field of wireless technology, in particular to terminal equipment.
Background
With the development of electronic technology, terminal devices such as mobile phones have been extended to life and work aspects of people. When the current terminal device is designed with an antenna, a main antenna or a diversity antenna is usually designed at the bottom of the terminal device, and due to the design of the antenna position, when a user holds the terminal device with hands, the user's hands can interfere with the receiving and transmitting signals of the antenna, which causes a dead holding phenomenon.
In the prior art, the influence of hand-held terminal equipment on the receiving and transmitting signals of an antenna is reduced mainly through the logic switching function of the antenna. The terminal equipment can be provided with a standby antenna besides the main antenna, and the standby antenna is arranged at the top of the terminal equipment and is not easy to hold by a user. When the terminal device is detected to be held by hand, the terminal device can be switched to use the standby antenna.
However, due to the complex top antenna environment of the terminal device, the performance of the antenna is reduced due to the camera and various sensors, and the threshold value of logic switching cannot be accurately defined due to the complex outfield environment of the terminal device. Therefore, the standby antenna has poorer performance than the main antenna which is normally used, and even if the antenna is switched when a user holds the terminal equipment, the influence on the receiving and transmitting signals of the terminal equipment is still larger.
Disclosure of Invention
The application provides terminal equipment, which aims to solve the problem that in the prior art, when a user holds the terminal equipment, the signal receiving and transmitting of the terminal equipment are greatly influenced.
The application provides a terminal device, comprising: an antenna;
the terminal equipment is operated with a first system and a second system; the antenna is in a balanced mode state of the working frequency band of the first system and the working frequency band of the second system.
In an alternative embodiment, the antenna is a LOOP antenna;
the first end of the first monopole of the LOOP antenna is connected with the main board of the terminal equipment, the first end of the second monopole of the LOOP antenna is connected with the main board of the terminal equipment, the second end of the first monopole is connected with the second end of the second monopole, and the first monopole and the second monopole form a dipole structure.
In an alternative embodiment, the balanced mode state is that the LOOP antenna is antenna tuned by shifting the operating frequency band of the first system and the operating frequency band of the second system.
In an alternative embodiment, the terminal device further includes an antenna matching circuit;
the antenna matching circuit is used for carrying out matching excitation on the LOOP antenna so as to enable the LOOP antenna to be in a balanced mode state.
In an alternative embodiment, the antenna is a T-type antenna;
the first end of a third monopole of the T-shaped antenna is connected with a main board of the terminal equipment, the second end of the third monopole is connected with a fourth monopole of the T-shaped antenna, and the third monopole and the fourth monopole form a dipole structure.
In an alternative embodiment, the terminal device further includes an antenna matching circuit;
the antenna matching circuit is used for carrying out matching excitation on the T-shaped antenna so as to enable the T-shaped antenna to be in a balanced mode state.
In an alternative embodiment, the terminal device further includes: a first parasitic branch and a second parasitic branch;
the first parasitic branch and the second parasitic branch are connected with a main board of the terminal equipment, and the first parasitic branch and the second parasitic branch are located on the same side of a connecting point of the antenna and the main board.
In an alternative embodiment, the first parasitic branch and the second parasitic branch form a dipole structure through the main board conducting current, so that the antenna is in a balanced mode state.
In an alternative embodiment, the first system is a public network system, and the second system is a private network system.
In an alternative embodiment, the second system has an operating frequency band of 1.4GHZ.
In an alternative embodiment, the antenna is arranged at the bottom of the terminal device.
The terminal equipment provided by the application comprises an antenna, wherein the terminal equipment is operated by a first system and a second system; the antenna is in a balanced mode state of the operating frequency band of the first system and the operating frequency band of the second system. The influence of the user holding on the antenna performance is realized by changing the distributed current of the main board of the terminal equipment, and the distributed current of the main board is reduced by the balanced mode state of the antenna, so that the influence on the receiving and transmitting signals of the terminal equipment can be reduced when the user holds the terminal equipment.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the following description of the embodiments or the drawings used in the description of the prior art will be given in brief, it being obvious that the drawings in the description below are some embodiments of the application and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an antenna according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another antenna according to an embodiment of the present application;
fig. 3 is a schematic diagram of a structure of another antenna according to an embodiment of the present application.
Reference numerals:
a 100-antenna;
200-a main board;
a 101-LOOP antenna;
a 102-T antenna;
110-a first monopole;
120-a second monopole;
130-a third monopole;
140-fourth monopole;
150-a first parasitic branch;
160-a second parasitic branch;
170-current Null point;
180-feed point.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
With the development of electronic technology, terminal devices such as mobile phones have been extended to life and work aspects of people. When the current terminal device is designed with an antenna, a main antenna or a diversity antenna is usually designed at the bottom of the terminal device, and due to the design of the antenna position, when a user holds the terminal device with hands, the user's hands can interfere with the receiving and transmitting signals of the antenna, which causes a dead holding phenomenon. In the prior art, the influence of hand-held terminal equipment on the receiving and transmitting signals of an antenna is reduced mainly through the logic switching function of the antenna. The terminal equipment can be provided with a standby antenna besides the main antenna, and the standby antenna is arranged at the top of the terminal equipment and is not easy to hold by a user. When the terminal device is detected to be held by hand, the terminal device can be switched to use the standby antenna. However, due to the complex top antenna environment of the terminal device, the performance of the antenna is reduced due to the camera and various sensors, and the threshold value of logic switching cannot be accurately defined due to the complex outfield environment of the terminal device. Therefore, the standby antenna has poorer performance than the main antenna which is normally used, and even if the antenna is switched when a user holds the terminal equipment, the influence on the receiving and transmitting signals of the terminal equipment is still larger.
In order to solve the above problems, the present application provides a terminal device, which uses the balanced mode state of the antenna of the terminal device or creates the balanced mode state of the antenna of the terminal device, so as to reduce the distributed current of the main board, and further reduce the influence on the receiving and transmitting signals of the terminal device when the user holds the terminal device.
The technical scheme of the application is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Referring to fig. 1, the terminal device includes: an antenna;
the terminal equipment is operated with a first system and a second system;
the antenna is in a balanced mode state of the operating frequency band of the first system and the operating frequency band of the second system.
The antenna of the terminal device is described below.
The type of antenna of the terminal device is not limited in the embodiments of the present application, and in some embodiments, a LOOP antenna 101 may be shown in fig. 1, and in other embodiments, a T-type antenna 102 may be also shown.
The application does not limit the position of the antenna in the terminal equipment, the antenna can be arranged at the top of the terminal equipment, can be arranged at the bottom of the terminal equipment, and can be an external antenna or an internal antenna.
In order to improve the performance of the antenna and avoid the influence of cameras and sensors at the top of the terminal device, in a preferred embodiment the antenna may be arranged at the bottom of the terminal device. In order to avoid the influence of the external antenna on the appearance of the terminal device and to facilitate the user to carry the terminal device, in a preferred embodiment, the antenna may be an internal antenna.
The first system and the second system of the terminal device are explained below.
In the present application, the terminal device may operate two systems, such as a first system and a second system, simultaneously. The first system and the second system may be operating systems of the terminal device, and may be, for example, an android operating system, an input-output system (input output system, IOS), or other self-research operating systems.
In some embodiments, if the terminal device has two modes, namely a public network and a private network, the first system may be a public network system, the second system may be a private network system, the first system is operated when the terminal device is connected to the public network, and the second system is operated when the terminal device is connected to the private network.
The embodiment of the application does not limit the working frequency band of the first system and the working frequency band of the second system, and can be set according to specific situations. For example, if the second system is a private network system, the working frequency band of the second system is 1.4GHZ.
The balanced mode state in which the antenna of the terminal device is in will be described below.
The balanced mode state in the embodiment of the application can be suitable for terminal equipment of two systems and can also be suitable for terminal equipment of only one system.
In the application, the principle of reducing the influence on the receiving and transmitting signals of the terminal equipment when the user holds the terminal equipment by the balanced mode state of the antenna of the terminal equipment is as follows: since the influence of the user's hand holding on the antenna performance is achieved by changing the distributed current of the main board 200 of the terminal device, the distributed current of the main board 200 can be reduced by the balanced mode state of the antenna, so that the current is mainly distributed on the antenna. When the user holds the terminal device, even if the distributed current of the main board 200 is affected, the variation value of the distributed current is relatively small, so that the influence on the transceiving signal of the terminal device can be reduced when the user holds the terminal device.
The embodiment of the present application does not limit how to put the antenna of the terminal device in the balanced mode, and in some embodiments, the terminal device is implemented through antenna tuning, and if the antenna is the LOOP antenna 101, for example, the balanced mode of the antenna may be put into the balanced mode by adjusting the 2λ balanced resonant mode to λ balanced resonant mode.
Furthermore, in some embodiments, the terminal device may place the antenna of the terminal device in a balanced mode state by antenna matching excitation, in other embodiments, the antenna of the terminal device may be placed in a balanced mode state by adding parasitic branches.
It should be noted that any of the above methods may be used to place the antenna of the terminal device in a balanced mode state, or multiple methods may be used simultaneously to place the antenna of the terminal device in a balanced mode state.
Table 1 shows various indexes of hand holding when the antenna provided by the embodiment of the application is in the balanced mode state. As shown in table 1, according to the OTA actual measurement value, after the hand-held operation is performed at the operating frequency of 1.4Ghz, the deteriorated power gain is 1.9dB, and the power gain is significantly better than the power gain of 4dB of the nominal deteriorated power gain of the standard index. Therefore, the antenna of the terminal equipment is in a balanced mode state, so that the influence on the receiving and transmitting signals of the terminal equipment when a user holds the terminal equipment can be obviously reduced. Wherein FS is free space, HL is left hand, HL is right hand, TRP is total radiation power, and TIS is radiation performance receiving parameter.
TABLE 1
The terminal equipment provided by the embodiment of the application comprises an antenna, wherein the terminal equipment is operated with a first system and a second system; the antenna is in a balanced mode state of the operating frequency band of the first system and the operating frequency band of the second system. Since the influence of the user's hand holding on the antenna performance is achieved by changing the distribution current of the main board 200 of the terminal device, the feeding current of the antenna is not distributed on the board in a large amount in the balanced mode, and at this time, when the terminal device is held, the hand holding hardly affects the current on the antenna through the distribution current on the main board 200 because the distribution current on the main board 200 is small.
The manner in which the different types of antennas are in the balanced mode state is described below.
Fig. 1 shows a LOOP antenna 101.
Wherein, a first end of the first monopole 110 of the LOOP antenna 101 is connected to the main board 200 of the terminal device, a first end of the second monopole 120 of the LOOP antenna 101 is connected to the main board 200 of the terminal device, a second end of the first monopole 110 is connected to a second end of the second monopole 120, and the first monopole 110 and the second monopole 120 form a dipole structure.
The dipoles (electric dipoles) are a system composed of two equal-quantity point charges, and each dipole comprises two monopoles. The main board 200 of the terminal device may be made using a printed circuit (Printed Circuit Board, PCB).
In some embodiments, the second end of the first monopole 110 and the second end of the second monopole 120 are connected at a current zero (Null) point 170.
Note that, the LOOP antenna 101 shown in fig. 1 is only a LOOP antenna 101 in a λ -balanced resonance mode, and for how the LOOP antenna 101 in a 2λ -balanced resonance mode forms a dipole structure, the manner in which the LOOP antenna 101 in a λ -balanced resonance mode forms a dipole structure may be referred to, which is not described herein.
In some embodiments, the balanced mode state of LOOP antenna 101 may be used to antenna tune LOOP antenna 101 by shifting the operating frequency band of the first system and the operating frequency band of the second system.
In other embodiments, the terminal device further comprises an antenna matching circuit.
The antenna matching circuit is used for performing matching excitation on the LOOP antenna 101 so as to make the LOOP antenna 101 in a balanced mode state.
The matching circuit can comprise an inductor and a capacitor, and the embodiment of the application does not limit the structure of the matching circuit and can adopt any existing structure of the matching circuit.
It should be noted that, the balanced mode state of LOOP antenna 101 may be implemented by only antenna tuning, or may be implemented by only matching excitation, or may be implemented by both antenna tuning and matching excitation.
In the terminal device provided by the embodiment of the application, if the antenna is an annular LOOP antenna, the first end of the first monopole of the LOOP antenna is connected with the main board of the terminal device, the first end of the second monopole of the LOOP antenna is connected with the main board of the terminal device, the second end of the first monopole is connected with the second end of the second monopole, and the first monopole and the second monopole form a dipole structure. The balanced mode state is that the LOOP antenna is subjected to antenna debugging by shifting the working frequency band of the first system and the working frequency band of the second system, or the antenna matching circuit is used for carrying out matching excitation on the LOOP antenna so as to enable the LOOP antenna to be in the balanced mode state. By the mode, the feed current of the antenna can not be distributed on the board in a large quantity, and when the terminal equipment is held by hands, the current on the antenna is hardly influenced by the distributed current on the main board by hands due to the fact that the distributed current on the main board is less.
On the basis of the above embodiments, the antennas may be put in a balanced mode state in different manners for different types of antennas. Fig. 2 is a schematic structural diagram of another terminal device according to an embodiment of the present application, where the antenna in fig. 2 is a T-type antenna 102.
As shown in fig. 2, a first end of the third monopole 130 of the T-shaped antenna 102 is connected to the main board 200 of the terminal device, a second end of the third monopole 130 is connected to the fourth monopole 140 of the T-shaped antenna 102, and the third monopole 130 and the fourth monopole 140 form a dipole structure.
In some embodiments, the terminal device further comprises an antenna matching circuit.
The antenna matching circuit is used for carrying out matching excitation on the T-shaped antenna 102 so as to enable the T-shaped antenna 102 to be in a balanced mode state.
In the terminal device provided by the embodiment of the application, if the antenna is a T-shaped antenna, the first end of the third monopole of the T-shaped antenna is connected with the main board of the terminal device, the second end of the third monopole is connected with the fourth monopole of the T-shaped antenna, the third monopole and the fourth monopole form a dipole structure, and the T-shaped antenna can be subjected to matching excitation through the antenna matching circuit of the terminal device so as to enable the T-shaped antenna to be in a balanced mode state. By the mode, the feed current of the antenna can not be distributed on the board in a large quantity, and when the terminal equipment is held by hands, the current on the antenna is hardly influenced by the distributed current on the main board by hands due to the fact that the distributed current on the main board is less.
On the basis of the embodiment, besides the antenna can be in the balanced mode state through antenna debugging and proper antenna matching excitation, the antenna can be in the balanced mode state through additionally adding a parasitic branch. Fig. 3 is a schematic structural diagram of still another terminal device according to an embodiment of the present application, where, as shown in fig. 3, the terminal device includes:
a first parasitic leg 150 and a second parasitic leg 160.
The first parasitic branch 150 and the second parasitic branch 160 are both connected to the main board 200 of the terminal device, and the first parasitic branch 150 and the second parasitic branch 160 are both located on the same side of the connection point of the antenna 100 and the main board 200.
In some embodiments, the first parasitic branch 150 and the second parasitic branch 160 conduct current through the motherboard 200 to form a dipole structure such that the antenna 100 is in a balanced mode state.
The connection point between the antenna 100 and the motherboard 200 may also be referred to as the feed point 180 of the antenna.
In some embodiments, since the first parasitic branch 150 is disposed near the feeding point, the first and second parasitic branches 150 and 160 are turned on by the main board 200, and induced currents are generated on the first and second parasitic branches 150 and 160 by electromagnetic induction, so that the first and second parasitic branches 150 and 160 are laid out in a dipole form, forming a balanced mode.
The terminal equipment provided by the embodiment of the application further comprises a first parasitic branch and a second parasitic branch, wherein the first parasitic branch and the second parasitic branch are connected with a main board of the terminal equipment, one side of the first parasitic branch is adjacent to a connection point of an antenna and the main board, and the other side of the first parasitic branch is the second parasitic branch. The first parasitic branch and the second parasitic branch form a dipole structure through the conduction current of the main board, so that the antenna is in a balanced mode state. By the mode, the feed current of the antenna can not be distributed on the board in a large quantity, and when the terminal equipment is held by hands, the current on the antenna is hardly influenced by the distributed current on the main board by hands due to the fact that the distributed current on the main board is less.
In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. are used to indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present application and to simplify the description, and do not indicate or imply that the referred location or element must have a specific orientation, in a specific configuration and operation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a 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 one or more such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can lead the interior of two elements to be communicated or lead the two elements to be in interaction relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
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 application has been described in detail with reference to the foregoing embodiments, it will 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 application.
Claims (5)
1. A terminal device, characterized in that the terminal device comprises: an antenna;
the terminal equipment is operated with a first system and a second system, wherein the first system is a public network system, and the second system is a private network system;
the antenna is in a balanced mode state of the working frequency band of the first system and the working frequency band of the second system;
the antenna is a T-shaped antenna;
the first end of a third monopole of the T-shaped antenna is connected with a main board of the terminal equipment, and the second end of the third monopole is connected with a fourth monopole of the T-shaped antenna;
the terminal equipment further comprises an antenna matching circuit;
the antenna matching circuit is used for carrying out matching excitation on the T-shaped antenna so as to enable the T-shaped antenna to be in a balanced mode state.
2. The terminal device according to claim 1, characterized in that the terminal device further comprises: a first parasitic branch and a second parasitic branch;
the first parasitic branch and the second parasitic branch are connected with a main board of the terminal equipment, and the first parasitic branch and the second parasitic branch are located on the same side of a connecting point of the antenna and the main board.
3. The terminal device of claim 2, wherein the first and second parasitic branches conduct current through the motherboard to form a dipole structure to place the antenna in a balanced mode state.
4. The terminal device of claim 1, wherein the operating frequency band of the second system is 1.4GHZ.
5. A terminal device according to any of claims 1-3, characterized in that the antenna is arranged at the bottom of the terminal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911396236.0A CN113131181B (en) | 2019-12-30 | 2019-12-30 | Terminal Equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911396236.0A CN113131181B (en) | 2019-12-30 | 2019-12-30 | Terminal Equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113131181A CN113131181A (en) | 2021-07-16 |
| CN113131181B true CN113131181B (en) | 2023-11-21 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911396236.0A Active CN113131181B (en) | 2019-12-30 | 2019-12-30 | Terminal Equipment |
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| CN (1) | CN113131181B (en) |
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