CN107516762A - A kind of antenna structure and mobile terminal - Google Patents
A kind of antenna structure and mobile terminal Download PDFInfo
- Publication number
- CN107516762A CN107516762A CN201710639296.5A CN201710639296A CN107516762A CN 107516762 A CN107516762 A CN 107516762A CN 201710639296 A CN201710639296 A CN 201710639296A CN 107516762 A CN107516762 A CN 107516762A
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- Prior art keywords
- antenna
- radiant section
- feed
- antenna radiant
- state
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Classifications
-
- 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
- H01Q1/12—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
-
- 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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
Abstract
The present invention provides a kind of antenna structure and mobile terminal.The antenna structure includes：Feed；The antenna radiator being connected with the feed, wherein the antenna radiator includes at least one first antenna radiant section in umbrella-shaped structure, include antenna receiving port in the first antenna radiant section of umbrella-shaped structure, the antenna receiving port is away from the feed.The present invention by be in antenna radiator umbrella-shaped structure first antenna radiant section structure design so that the polarization mode of antenna levels off to circular polarisation, can be efficiently received the circularly polarized signal of GNSS satellite transmission, reduces polarization loss；Meanwhile the antenna receiving port of first antenna radiant section is set away from feed so that the radiation directivity of antenna is generally directed to episphere, improves the gain of episphere, improves the efficiency of reception signal.
Description
Technical field
The present invention relates to antenna technical field, more particularly to a kind of antenna structure and mobile terminal.
Background technology
With a large amount of popularizations of smart mobile phone, people are more and more to the demand of mobile phone positioning and navigation, therefore mobile phone
GNSS (Global Navigation Satellite System, GLONASS), especially GPS (Global
Positioning System, global positioning system) performance become more and more important.And in Antenna Design and radiation space increasingly
It is small, and configuration design is challenged under increasing trend, as metal ingredient and ratio are more and more, antenna performance often thus it is bad
Change.
The scheme of GNSS/GPS antennas is single built-in aerial mostly in mobile phone at present, to carry out positioning work.It is and built-in
The implementation of GNSS antenna is sheet metal, FPC, LDS, metal edge frame or bonnet etc., and the polarization mode of such antenna is basic
For linear polarization, but the polarization mode of GNSS satellite is circular polarisation, so being gone to receive the signal of circular polarisation, meeting with the antenna of linear polarization
Cause certain polarization loss, it is impossible to the effective reception for carrying out complete signal intensity.And GNSS satellite is not to be positioned at sky
Land, therefore the important ratio lower semisphere antenna efficiency of the episphere antenna efficiency of mobile phone GNSS antenna is high, that is, GNSS antenna
Directional diagram be just particularly important relative to the antenna of other functions, but according to built in common mobile phone GNSS antenna stacking
Put and design architecture, the antenna efficiency of its episphere are often low compared with lower semisphere.
The content of the invention
The embodiment of the present invention provides a kind of antenna structure and mobile terminal, to solve the GNSS antenna of mobile phone in the prior art
Caused by when receiving the signal that GNSS satellite is sent the problem of polarization loss.
In a first aspect, the embodiment of the present invention provides a kind of antenna structure, applied to mobile terminal, including：
Feed；
The antenna radiator being connected with the feed, wherein it is in umbrella-shaped structure that the antenna radiator, which includes at least one,
First antenna radiant section, include antenna receiving port in the first antenna radiant section of umbrella-shaped structure, the antenna receiving port is remote
From the feed.
Second aspect, the embodiment of the present invention provide a kind of mobile terminal, including：
The antenna structure provided such as first aspect of the embodiment of the present invention；
Mainboard, the mainboard include：Earth terminal；The feed is arranged on the mainboard, one end of the feed and institute
Earth terminal is stated to be connected；
Housing, the antenna radiator are arranged on the housing.
In the such scheme of the embodiment of the present invention, by the first antenna radiant section in antenna radiator being in umbrella-shaped structure
Structure design so that the polarization mode of antenna levels off to circular polarisation, can be efficiently received the circular polarisation of GNSS satellite transmission
Signal, reduce polarization loss；Meanwhile the antenna receiving port of first antenna radiant section is set away from feed so that the spoke of antenna
Penetrate directionality and be generally directed to episphere, improve the gain of episphere, improve the efficiency of reception signal.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is one of antenna structure view of the embodiment of the present invention；
Fig. 2 is the two of the antenna structure view of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
The invention discloses a kind of antenna structure, and as shown in Fig. 1~2, the antenna structure includes：Feed 1；Connect with feed 1
The antenna radiator 2 connect, wherein antenna radiator 2 include at least one first antenna radiant section 3 in umbrella-shaped structure, in umbrella
The first antenna radiant section 3 of type structure includes antenna receiving port 4, and antenna receiving port 4 is away from the feed 1.
Here, first antenna radiant section 3 is in umbrella-shaped structure, and the polarization mode that may be such that antenna using the structure design becomes
In circular polarisation, it so, it is possible effectively to receive the circularly polarized signal that GNSS satellite is sent, reduce polarization loss.
Preferably, antenna receiving port 4 is the maximum opening of the bore of umbrella-shaped structure, as shown in Figure 1.That is, from day
Line receiving port 4 tapers into close to the direction of feed 1, the bore of umbrella-shaped structure, and such set-up mode causes the spoke of antenna
Penetrate directionality and be generally directed to episphere, improve the gain of episphere, improve the efficiency of reception signal.
Preferably, the radius of antenna receiving port 4 is less than or equal to an operation wavelength.
Preferably, the length the second end of the antenna radiator 2 from the first end that feed 1 is connected to away from first end
Less than or equal to 1.5 operation wavelengths.
Explanation is needed exist for, the antenna structure of the embodiment of the present invention from width (radius of antenna receiving port 4) and is grown
Spend (length of antenna radiator 2) two aspects and carry out antenna structure dimension limitation, two purposes can be reached.First, it can protect
The working frequency of card antenna is fallen into scheduled frequency range；Second, extraneous factor (such as antenna environment, dielectric constant can be avoided
Deng) influence to antenna wavelength frequency deviation.
Here, it is preferred that, the radius of antenna receiving port 4 is a quarter operation wavelength.
Preferably, scheduled frequency range is 1550MHz~1620MHz.
In one embodiment of the present invention, as shown in figure 1, antenna radiator 2 also includes the second of a formation receiving space
Aerial radiation part 5, first antenna radiant section 3 are connected with the second aerial radiation part 5, and first antenna radiant section 3 wraps
Include the first state being placed in receiving space and the second state in umbrella-shaped structure is stretched out from receiving space；Wherein second day
Beta radiation part 5 is arranged at first antenna radiant section 3 close to the side of the feed 1.
It should be noted that when first antenna radiant section 3 is one, the antenna spoke of first antenna radiant section 3 and second
Part 5 is penetrated to be connected；First antenna radiant section 3 for it is multiple when, one of them in multiple first antenna radiant sections 3 is with the
Two aerial radiation parts 5 are connected.
Preferably, as shown in figure 1, the second aerial radiation part 5 is a hollow cylinder.First antenna radiant section 3 can be received
It is placed in hollow cylinder.
Here it should be noted that, the receiving that first antenna radiant section 3 can be placed in the formation of the second aerial radiation part 5 is empty
In.Antenna can be so caused when being not used, not influence the overall aesthetics of antenna structure.
Further, the antenna structure of the embodiment of the present invention is applied to mobile terminal, that is to say, that the antenna structure is set
On mobile terminals.Here, it is preferred that, the second aerial radiation part can be placed in mobile terminal or stretch out mobile terminal
Outside.So when antenna is not used, the overall aesthetics of mobile terminal is nor affected on.
Specifically, being provided with rotational structure 6 on the second aerial radiation part 5, pass through rotational structure 6, first antenna radiation
When part 3 is in the second state, it can be rotated relative to the second aerial radiation part 5；
Wherein, when first antenna radiant section 3 is in the second state, with the 5 concentric setting of the second aerial radiation part.
Here, when first antenna radiant section 3 is in the second state, i.e., first antenna radiant section 3 is stretched from receiving space
Go out when being in umbrella-shaped structure, by rotational structure 6, so, be able to can meet relative to the second aerial radiation part 5 around rotation
Steering when the display screen transverse screen of mobile terminal uses.
Specifically, as shown in Fig. 2 first antenna radiant section 3 is stretched out from receiving space when being in umbrella-shaped structure, pass through rotation
Rotation structure 6,360 ° of rotations can be carried out, when mobile terminal transverse screen in use, the dextrorotation of first antenna radiant section 3 can be made
Turn 90 °, allow first antenna radiant section 3 to point to overhead all the time, beneficial to reception GNSS/GPS signals.
Explanation is needed exist for, when first antenna radiant section 3 is in first state, rotational structure 6 and first antenna spoke
Penetrate part 3 while be placed in inside receiving space.That is, what rotational structure 6 can be formed in the second aerial radiation part 5
The inside of receiving space moves up and down.
Specifically, rotational structure 6 includes：Support bar and the revolving part being arranged on support bar；The both ends difference of support bar
The inwall of the receiving space formed with the second aerial radiation part 5 abuts, and can be slided up and down along the inwall of receiving space.This
In, a kind of only achievable structure of rotational structure 6, other can realize that the structure of the turning effort of rotational structure 6 can use,
Here it is not specifically limited.
Here, it is preferred that, as shown in figure 1, when first antenna radiant section 3 is in second state, first antenna radiation
Part 3 is connected by support member 7 with the second aerial radiation part 5；When first antenna radiant section 3 is in the first state,
Support member 7 is placed in inside the receiving space simultaneously with first antenna radiant section 3.
It should be noted that support member 7 is located between the aerial radiation part 5 of first antenna radiant section 3 and second, and point
It is not connected with the aerial radiation part 5 of first antenna radiant section 3 and second.
In another preferred embodiment of the present invention, first antenna radiant section 3 includes at least two deformed states；Wherein,
When one aerial radiation part 3 is in different deformation state, the radius of antenna receiving port 4 is different.
It should be noted that under external force, in the first antenna radiant section 3 of umbrella-shaped structure upward away from feed 1
The first deformed state can be deformed to during extension, now, the antenna receiving port 4 of the first antenna radiant section after deformation
Radius diminish, and be still in umbrella-shaped structure；Then, the first antenna radiant section 3 after a deformation can continue up extension and become
Shape is to the second deformed state, and now, the radius of the antenna receiving port 4 of the second aerial radiation part after deformation diminishes again, and
Still it is in umbrella-shaped structure.Here, first antenna radiant section 3 is in deformation process, and its umbrella-shaped structure is more and more far away from feed 1.This
Sample, the intensity of antenna reception signal and the directive property of directional diagram can be adjusted within the specific limits.
Another preferred embodiment of the present invention, as shown in Fig. 2 first antenna radiant section 3 is multiple, multiple first antenna spokes
Part 3 is penetrated to be sequentially connected from the side for being laterally away from feed 1 close to feed 1；Wherein, the radius of each antenna receiving port 4
.
Here, the radius size of the antenna receiving port 4 of multiple first antenna radiant sections 3 is from close to the one lateral of feed 1
Side away from feed 1 is sequentially reduced；Or the radius size of the antenna receiving port 4 of multiple first antenna radiant sections 3 from by
One side for being laterally away from feed 1 of nearly feed 1 increases successively.
It should be noted that antenna radiator 2 is due to including multiple first antenna radiant sections 3 in the present embodiment so that
The whole height of antenna radiator 2 uprises, and then can reach within the specific limits, and the range of receiving and signal intensity of antenna increase
By force, different use demand scenes is adapted to.
Further, as shown in Fig. 2 the antenna radiator 2 of the embodiment of the present invention also includes：Multiple cylindrical circular three
Aerial radiation part 8；Wherein, multiple first antenna radiant sections 3 correspond with multiple third antenna radiant sections 8 connect respectively
Connect；Each first antenna radiant section 3 includes being placed in the 3rd inside the third antenna radiant section 8 of corresponding connection
State and from the third antenna radiant section 8 of corresponding connection stretch out in umbrella-shaped structure the 4th state.
Here, third antenna radiant section 8 is cylindrical.Preferably, third antenna radiant section 8 is hollow cylinder, is used
In when first antenna radiant section 3 is in the third state, first antenna radiant section 3 is retractd in it.
Specifically, multiple third antenna radiant sections 8 are sequentially connected；It is more when first antenna radiant section 3 is in the third state
The individual third antenna radiant section 8 is placed in inside the receiving space.
Here, the third antenna radiant section 8 of the side away from feed can be received in two neighboring third antenna radiant section 8
It is disposed adjacent to the third antenna radiant section 8 of the side of feed.That is, multiple cylindrical circular third antenna radiant sections
8 when being placed in inside the receiving space, before the 3rd day in multiple third antenna radiant sections 8 apart from feed 1 farthest
Beta radiation part 8 is located at the centre of the inside for the second aerial radiation part 5 for forming receiving space, nearest apart from feed 1
Third antenna radiant section 8 be located at the inside of the second aerial radiation part 5 close to the position at its edge.It is also understood that
Multiple third antenna radiant sections 8 one cover one, and the circular cylinder radius of multiple third antenna radiant sections 8 is by the second aerial radiation
The inside center of part 5 increases successively to its edge.
It should be noted that during multiple first antenna radiant sections 3 reach the 4th state by the third state, typically
Ground needs the effect of external force, and in the presence of external force, the second aerial radiation part 5 is stretched out outside the housing 10 of mobile terminal, connects
The receiving near third antenna radiant section 8 from the second aerial radiation part 5 at the edge of the second aerial radiation part 5 is empty
Between inside stretch out, first day be connected with the third antenna radiant section 8 near the edge of the second aerial radiation part 5
It is in umbrella-shaped structure that beta radiation part 3, which is also stretched,；Now, remaining third antenna radiant section 8 was placed in this near second day
In the third antenna radiant section 8 at the edge of beta radiation part 5, if the reception that user wants the range of receiving and signal of antenna is strong
Degree becomes strong, then can continue to external force so that the third antenna irradiation unit with this near the edge of the second aerial radiation part 5
Divide third antenna radiant section of the 8 adjacent third antenna radiant sections 8 from this near the edge of the second aerial radiation part 5
8 inside is stretched out, and the adjacent with the third antenna radiant section 8 near the edge of the second aerial radiation part 5 the 3rd
It is in umbrella-shaped structure that the first antenna radiant section 3 that aerial radiation part 8 connects, which also stretches, the like.
Conversely, during multiple first antenna radiant sections 3 reach the third state by the 4th state, usually it is also required to
The effect of external force, in the presence of external force, multiple first antenna radiant sections 3 are placed in the third antenna spoke of each corresponding connection
The inside of part 8 is penetrated, finally, multiple third antenna radiant sections 8 are placed in the inside of the second aerial radiation part 5 again, and second
Aerial radiation part 5 is placed in the housing 10 of mobile terminal.
The embodiment of the present invention also provides a kind of mobile terminal, as shown in Fig. 1~Fig. 2, including：As described in above-mentioned embodiment
Antenna structure；Mainboard (not shown), the mainboard include：Earth terminal 9；Feed 1 is arranged on mainboard, one end of feed 1 with
Earth terminal 9 is connected；Housing, antenna radiator 2 are arranged on housing 10.
Preferably, antenna radiator 2 can be placed in the housing 10 of mobile terminal.So, when without location navigation demand,
It can store and be recessed in mobile terminal, not influence the aesthetic appearance of mobile terminal.
Preferably, the mobile terminal also includes：The GNSS/GPS antennas being arranged in housing 10.So, can be with this hair
The antenna structure that bright embodiment provides forms double GNSS/GPS antenna systems.In weak signal area, when being arranged in housing 10
GNSS/GPS antennas, i.e., when built-in GNSS/GPS antennas can not meet positioning or navigation needs, user can open the present invention
When embodiment provide the antenna structure in umbrella-shaped structure, to strengthen the reception of GNSS/GPS signals.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (11)
- A kind of 1. antenna structure, applied to mobile terminal, it is characterised in that including：Feed (1)；The antenna radiator (2) being connected with the feed (1), wherein it is in umbellate form that the antenna radiator (2), which includes at least one, The first antenna radiant section (3) of structure, include antenna receiving port (4), institute in the first antenna radiant section (3) of umbrella-shaped structure Antenna receiving port (4) is stated away from the feed (1).
- 2. antenna structure according to claim 1, it is characterised in that the radius of the antenna receiving port (4) be less than or Equal to one operation wavelength.
- 3. antenna structure according to claim 1, it is characterised in that the antenna radiator (2) from the feed (1) The first end being connected is less than or equal to 1.5 operation wavelengths to the length between the second end away from the first end.
- 4. antenna structure according to claim 1, it is characterised in that the antenna radiator (2) also includes one and forms appearance Receive the second aerial radiation part (5) in space, the first antenna radiant section (3) and the second aerial radiation part (5) It is connected, the first antenna radiant section (3) includes being placed in first state inside the receiving space and from the appearance Receive and the second state in umbrella-shaped structure is stretched out in space；Wherein described second aerial radiation part (5) is arranged at the first antenna radiant section (3) close to the feed (1) Side.
- 5. antenna structure according to claim 4, it is characterised in that be provided with the second aerial radiation part (5) Rotational structure (6),, can when the first antenna radiant section (3) is in second state by the rotational structure (6) Rotated relative to the second aerial radiation part (5)；Wherein, it is same with the second aerial radiation part (5) when the first antenna radiant section (3) is in second state Axle center is set.
- 6. antenna structure according to claim 4, it is characterised in that the first antenna radiant section (3) is in described the During two-state, the first antenna radiant section (3) is connected by support member (7) with the second aerial radiation part (5)；When the first antenna radiant section (3) is in the first state, the support member (7) and the first antenna irradiation unit Divide (3) while be placed in inside the receiving space.
- 7. antenna structure according to claim 6, it is characterised in that the first antenna radiant section (3) is included at least Two deformed states；Wherein, when the first antenna radiant section (3) is in different deformation state, the radius of the antenna receiving port (4) is not Together.
- 8. antenna structure according to claim 4, it is characterised in that the first antenna radiant section (3) is multiple；The antenna radiator (2) also includes：Multiple cylindrical circular third antenna radiant sections (8)；Wherein, multiple first antenna radiant sections (3) correspond with multiple third antenna radiant sections (8) respectively Connection；Each first antenna radiant section (3) includes the third antenna radiant section for being placed in corresponding connection (8) stretched out in the third state of inside and the third antenna radiant section (8) from corresponding connection in umbrella-shaped structure 4th state.
- 9. antenna structure according to claim 8, it is characterised in that multiple third antenna radiant sections (8) are successively Connection；When the first antenna radiant section (3) is in the third state, multiple third antenna radiant sections (8) are placed in Inside the receiving space.
- 10. antenna structure according to claim 1, it is characterised in that the first antenna radiant section (3) to be multiple, Multiple first antenna radiant sections (3) are laterally away from the side of the feed (1) successively from close to the one of the feed (1) Connection；Wherein, the radius of each antenna receiving port (4).
- A kind of 11. mobile terminal, it is characterised in that including：Antenna structure as described in any one of claim 1~10；Mainboard, the mainboard include：Earth terminal (9)；The feed (1) is arranged on the mainboard, one end of the feed (1) It is connected with the earth terminal (9)；Housing (10), the antenna radiator (2) are arranged on the housing (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710639296.5A CN107516762B (en) | 2017-07-31 | 2017-07-31 | Antenna structure and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710639296.5A CN107516762B (en) | 2017-07-31 | 2017-07-31 | Antenna structure and mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107516762A true CN107516762A (en) | 2017-12-26 |
| CN107516762B CN107516762B (en) | 2019-12-13 |
Family
ID=60721818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710639296.5A Active CN107516762B (en) | 2017-07-31 | 2017-07-31 | Antenna structure and mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107516762B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809401A (en) * | 2018-04-24 | 2018-11-13 | 浙江麦知网络科技有限公司 | A kind of signal enhancing device |
| CN110492224A (en) * | 2018-05-14 | 2019-11-22 | Oppo广东移动通信有限公司 | The control method of electronic equipment and electronic equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1239537A2 (en) * | 1996-06-20 | 2002-09-11 | Kabushiki Kaisha Yokowo (also trading as Yokowo Co., Ltd.) | Retractable antenna for a portable radio apparatus |
| CN206134910U (en) * | 2016-11-09 | 2017-04-26 | 许昌学院 | Can embed shrink wiFi antenna |
-
2017
- 2017-07-31 CN CN201710639296.5A patent/CN107516762B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1239537A2 (en) * | 1996-06-20 | 2002-09-11 | Kabushiki Kaisha Yokowo (also trading as Yokowo Co., Ltd.) | Retractable antenna for a portable radio apparatus |
| CN206134910U (en) * | 2016-11-09 | 2017-04-26 | 许昌学院 | Can embed shrink wiFi antenna |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809401A (en) * | 2018-04-24 | 2018-11-13 | 浙江麦知网络科技有限公司 | A kind of signal enhancing device |
| CN108809401B (en) * | 2018-04-24 | 2021-11-23 | 浙江麦知网络科技有限公司 | Signal enhancement device |
| CN110492224A (en) * | 2018-05-14 | 2019-11-22 | Oppo广东移动通信有限公司 | The control method of electronic equipment and electronic equipment |
| CN110492224B (en) * | 2018-05-14 | 2021-04-23 | Oppo广东移动通信有限公司 | Electronic device and control method of electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107516762B (en) | 2019-12-13 |
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