CN113131181A - Terminal device - Google Patents
Terminal device Download PDFInfo
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- CN113131181A CN113131181A CN201911396236.0A CN201911396236A CN113131181A CN 113131181 A CN113131181 A CN 113131181A CN 201911396236 A CN201911396236 A CN 201911396236A CN 113131181 A CN113131181 A CN 113131181A
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- antenna
- terminal device
- monopole
- main board
- mode state
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Support Of Aerials (AREA)
Abstract
The invention provides a terminal device, which comprises an antenna, wherein the terminal device runs 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. Because the influence of holding the terminal device by the user on the antenna performance is realized by changing the distributed current of the main board of the terminal device, the distributed current of the main board is reduced through the balanced mode state of the antenna, and then the influence on the receiving and transmitting signals of the terminal device can be reduced when the user holds the terminal device by the user.
Description
Technical Field
The invention relates to the technical field of wireless, in particular to a terminal device.
Background
With the development of electronic technology, terminal devices such as mobile phones have been deeply involved in the aspects of life and work of people. When the current terminal equipment is used for designing an antenna, a main antenna or a diversity antenna is usually designed at the bottom of the terminal equipment, and due to the design of the antenna position, when a user holds the terminal equipment by a hand for use, the hand of the user can cause interference to the transmitting and receiving signals of the antenna, so that the phenomenon of 'death holding' is caused.
In the prior art, the influence of holding the terminal device by hand on the receiving and transmitting signals of the antenna is mainly reduced 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. And when the terminal equipment is detected to be held by hands, the terminal equipment can be switched to use the standby antenna.
However, the environment of the top antenna of the terminal device is complex, and a camera and various sensors are usually disposed, which may cause the performance of the antenna to be degraded, and the external field environment of the terminal device is complex, which may cause the threshold value of the logic switching to be not defined accurately. Therefore, the performance of the standby antenna is inferior to that of the main antenna used normally, and thus, when the user holds the terminal device by hand, even if the antenna is switched, the influence on the transmitting and receiving signals of the terminal device is still large.
Disclosure of Invention
The invention provides a terminal device, which aims to solve the problem that the receiving and transmitting signals of the terminal device are greatly influenced when a user holds the terminal device in the prior art.
The present invention provides a terminal device, including: an antenna;
the terminal equipment runs 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 a first monopole of the LOOP antenna is connected with a main board of the terminal device, the first end of a 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.
In an optional embodiment, the balanced mode state is an antenna tuning of the LOOP antenna by shifting an operating frequency band of the first system and an operating frequency band of the second system.
In an optional implementation manner, 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 optional embodiment, the antenna is a T-shaped antenna;
the first end of a 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 a fourth monopole of the T-shaped antenna, and the third monopole and the fourth monopole form a dipole structure.
In an optional implementation manner, 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 optional implementation manner, the terminal device further includes: a first parasitic branch and a second parasitic branch;
the first parasitic branch and the second parasitic branch are both connected with a main board of the terminal device, and the first parasitic branch and the second parasitic branch are both located on the same side of a connection point of the antenna and the main board.
In an optional implementation manner, the first parasitic branch and the second parasitic branch form a dipole structure by conducting current through the main board, so that the antenna is in a balanced mode state.
In an optional implementation manner, the first system is a public network system, and the second system is a private network system.
In an optional embodiment, the operating frequency band of the second system is 1.4 GHZ.
In an alternative embodiment, the antenna is disposed at the bottom of the terminal device.
The terminal equipment comprises an antenna, and a first system and a second system run on the terminal equipment; 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. Because the influence of holding the terminal device by the user on the antenna performance is realized by changing the distributed current of the main board of the terminal device, the distributed current of the main board is reduced through the balanced mode state of the antenna, and then the influence on the receiving and transmitting signals of the terminal device can be reduced when the user holds the terminal device by the user.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings needed to be used in the description of the embodiments or the prior art, and obviously, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an antenna according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another antenna provided in the embodiment of the present application;
fig. 3 is a schematic diagram of another antenna structure according to an embodiment of the present application.
Reference numerals:
100-an antenna;
200-a main board;
101-LOOP antenna;
a 102-T antenna;
110-a first monopole;
120-a second monopole;
130-a third monopole;
140-a fourth monopole;
150-first parasitic branch;
160-second parasitic branch;
170-Current Null Point;
180-feed point.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With the development of electronic technology, terminal devices such as mobile phones have been deeply involved in the aspects of life and work of people. When the current terminal equipment is used for designing an antenna, a main antenna or a diversity antenna is usually designed at the bottom of the terminal equipment, and due to the design of the antenna position, when a user holds the terminal equipment by a hand for use, the hand of the user can cause interference to the transmitting and receiving signals of the antenna, so that the phenomenon of 'death holding' is caused. In the prior art, the influence of holding the terminal device by hand on the receiving and transmitting signals of the antenna is mainly reduced 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. And when the terminal equipment is detected to be held by hands, the terminal equipment can be switched to use the standby antenna. However, the environment of the top antenna of the terminal device is complex, and a camera and various sensors are usually disposed, which may cause the performance of the antenna to be degraded, and the external field environment of the terminal device is complex, which may cause the threshold value of the logic switching to be not defined accurately. Therefore, the performance of the standby antenna is inferior to that of the main antenna used normally, and thus, when the user holds the terminal device by hand, even if the antenna is switched, the influence on the transmitting and receiving signals of the terminal device is still large.
In order to solve the above problems, the present invention provides a terminal device, which utilizes the balanced mode state of the antenna of the terminal device or creates the balanced mode state of the antenna of the terminal device to reduce the distributed current of the main board, so as to reduce the influence on the receiving and transmitting signals of the terminal device when the user holds the terminal device.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
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 runs 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.
The antenna of the terminal device is explained below.
The type of the antenna of the terminal device is not limited in the embodiment of the present application, and in some embodiments, the antenna may be a LOOP (LOOP) antenna 101 as shown in fig. 1, and in other embodiments, the antenna may also be a T-shaped antenna 102.
The position of the antenna at the terminal equipment is not limited, the antenna can be arranged at the top of the terminal equipment and also can be arranged at the bottom of the terminal equipment, and the antenna can be an external antenna or an internal antenna.
In order to improve the performance of the antenna and avoid the influence of the camera and the sensor on the top of the terminal equipment, in a preferred embodiment, the antenna can be arranged on the bottom of the terminal equipment. In order to avoid the influence of the external antenna on the appearance of the terminal device and 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 will be explained below.
In the application, the terminal device may operate two systems, such as the first system and the second system, simultaneously. The first system and the second system may both be operating systems of the terminal device, and may be, for example, an android operating system, an Input Output System (IOS), or other self-developed operating systems.
In some embodiments, if the terminal device has two modes, namely a public network mode and a private network mode, correspondingly, 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 accessed to the public network, and the second system is operated when the terminal device is accessed to the private network.
The working frequency range of the first system and the working frequency range of the second system are not limited and can be set according to specific conditions. For example, if the second system is a private network system, the operating frequency band of the second system is 1.4 GHZ.
The balanced mode state of the antenna of the terminal device 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 this application, the principle of reducing the influence of the balanced mode state of the antenna of the terminal device on the transmission and reception signals of the terminal device when the user holds the terminal device is as follows: since the influence of the user's hand on the antenna performance is realized 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 distribution current of the main board 200 is affected, the change value of the distribution current is relatively small, so that the effect on the transmitting and receiving signals of the terminal device can be reduced when the user holds the terminal device.
In the embodiment of the present application, how to make the antenna of the terminal device in the balanced mode state is not limited, and in some embodiments, the terminal device is implemented by antenna debugging, and for example, if the antenna is the LOOP antenna 101, the balanced mode state of the antenna may be made by adjusting the 2 λ balanced resonant mode to the λ balanced resonant mode.
In addition, in some embodiments, the terminal device may place the antenna of the terminal device in a balanced mode state through antenna matching excitation, and in other embodiments, the terminal device may place the antenna of the terminal device in a balanced mode state through adding parasitic branches.
It should be noted that the antenna of the terminal device may be in the balanced mode state by any one of the above-mentioned methods, or the antenna of the terminal device may be in the balanced mode state by a plurality of methods at the same time.
Table 1 shows various indexes of the antenna provided in the embodiment of the present application, which are held by hand when the antenna is in the balanced mode state. As shown in table 1, according to the measured value of OTA, after the operation frequency of the private network system is 1.4Ghz, the degraded power gain is 1.9dB, and the power gain is significantly better than the nominally degraded power gain of 4dB of the specification index. Therefore, the antenna of the terminal device is in a balanced mode state, so that the influence on the transmitting and receiving signals of the terminal device when a user holds the terminal device can be obviously reduced. Wherein, FS is free space, HL is left-hand holding, HL is right-hand holding, 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, and a first system and a second system run on the terminal equipment; 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. Because the influence of holding the terminal equipment by the hand of the user is realized by changing the distributed current of the main board 200 of the terminal equipment, the feed current of the antenna can not be distributed on the board in a large quantity under the balanced mode, and at the moment, when the terminal equipment is held by the hand, the current on the antenna is hardly influenced by the distributed current on the main board 200 due to the small distributed current on the main board 200.
The manner in which the different types of antennas are in a balanced mode state is explained below.
Fig. 1 shows a LOOP antenna 101.
The first end of the first monopole 110 of the LOOP antenna 101 is connected to the main board 200 of the terminal device, the first end of the second monopole 120 of the LOOP antenna 101 is connected to the main board 200 of the terminal device, the second end of the first monopole 110 is connected to the second end of the second monopole 120, and the first monopole 110 and the second monopole 120 form a dipole structure.
Wherein, the dipole (electric dipole) is a system composed of two equal-magnitude different-sign point charges, and correspondingly, each dipole comprises two monopoles. The main Board 200 of the terminal device may be made using a 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.
It should be noted that the LOOP antenna 101 shown in fig. 1 is only the LOOP antenna 101 in the λ balanced resonance mode, and for how the LOOP antenna 101 in the 2 λ balanced resonance mode forms a dipole structure, reference may be made to a manner in which the LOOP antenna 101 in the λ balanced resonance mode forms a dipole structure, which is not described herein again.
In some embodiments, the balanced mode state of the LOOP antenna 101 may be used for antenna tuning of the 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 to perform matching excitation on the LOOP antenna 101 so that the LOOP antenna 101 is in a balanced mode state.
The matching circuit may include an inductor and a capacitor, and the structure of the matching circuit is not limited in the embodiments of the present application, and any existing structure of the matching circuit may be used.
It should be noted that the balanced mode state of the LOOP antenna 101 may be implemented only by antenna tuning, only by matching excitation, or by both antenna tuning and matching excitation.
According to 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 performing matching excitation on the LOOP antenna, so that the LOOP antenna is in the balanced mode state. Through this mode, can make the feed current of antenna can not distribute in a large number on the board, hold terminal equipment this moment, because distributed current is few on the mainboard, hold and influence the electric current on the antenna through the distributed current on the mainboard very hardly.
On the basis of the above embodiments, for different types of antennas, the antennas can be in a balanced mode state in different ways. 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-shaped 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 performing matching excitation on the T-shaped antenna 102 so as to enable the T-shaped antenna 102 to be in a balanced mode state.
According to 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 that the T-shaped antenna is in a balanced mode state. Through this mode, can make the feed current of antenna can not distribute in a large number on the board, hold terminal equipment this moment, because distributed current is few on the mainboard, hold and influence the electric current on the antenna through the distributed current on the mainboard very hardly.
On the basis of the above embodiment, the antenna can be in a balanced mode state by antenna debugging and proper antenna matching excitation, and can also be in a balanced mode state by additionally adding parasitic branches. Fig. 3 is a schematic structural diagram of another terminal device provided in an embodiment of the present application, and as shown in fig. 3, the terminal device includes:
a first parasitic branch 150 and a second parasitic branch 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 stub 150 and the second parasitic stub 160 form a dipole structure by conducting current through the main board 200, so that the antenna 100 is in a balanced mode state.
Wherein, the connection point of the antenna 100 and the main board 200 can 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 parasitic branch 150 and the second parasitic branch 160 are conducted through the main board 200, and an induced current is generated on the first parasitic branch 150 and the second parasitic branch 160 through electromagnetic induction, so that the first parasitic branch 150 and the second parasitic branch 160 are disposed in a dipole form to form a balanced mode.
The terminal device 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 both connected with the main board of the terminal device, one side of the first parasitic branch is adjacent to a connection point of the 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 by conducting current through the main board, so that the antenna is in a balanced mode state. Through this mode, can make the feed current of antenna can not distribute in a large number on the board, hold terminal equipment this moment, because distributed current is few on the mainboard, hold and influence the electric current on the antenna through the distributed current on the mainboard very hardly.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, are used to indicate an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and thus, are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A terminal device, characterized in that the terminal device comprises: an antenna;
the terminal equipment runs 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.
2. The terminal device of claim 1, wherein said antenna is a LOOP antenna;
the first end of a first monopole of the LOOP antenna is connected with a main board of the terminal device, the first end of a 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.
3. The terminal device of claim 2, wherein the balanced mode state is antenna tuning of the LOOP antenna by shifting an operating frequency band of the first system from an operating frequency band of the second system.
4. The terminal device of claim 2, wherein the terminal device further comprises 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.
5. The terminal device of claim 1, wherein the antenna is a T-shaped antenna;
the first end of a 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 a fourth monopole of the T-shaped antenna, and the third monopole and the fourth monopole form a dipole structure.
6. The terminal device of claim 4, wherein 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 so as to enable the T-shaped antenna to be in a balanced mode state.
7. The terminal device according to claim 1, wherein the terminal device further comprises: a first parasitic branch and a second parasitic branch;
the first parasitic branch and the second parasitic branch are both connected with a main board of the terminal device, and the first parasitic branch and the second parasitic branch are both located on the same side of a connection point of the antenna and the main board.
8. The terminal device of claim 7, wherein the first parasitic stub and the second parasitic stub form a dipole structure by conducting current through the main board, so that the antenna is in a balanced mode state.
9. The terminal device according to any of claims 1-8, wherein the first system is a public network system and the second system is a private network system.
10. The terminal device of claim 9, wherein the operating frequency band of the second system is 1.4 GHZ.
11. A terminal device according to any of claims 1-8, 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 |
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|---|---|---|---|
| CN201911396236.0A CN113131181B (en) | 2019-12-30 | 2019-12-30 | Terminal Equipment |
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| CN113131181A true CN113131181A (en) | 2021-07-16 |
| CN113131181B CN113131181B (en) | 2023-11-21 |
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