CN105098364B - NFC antenna structure based on metal rear shell - Google Patents
NFC antenna structure based on metal rear shell Download PDFInfo
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- CN105098364B CN105098364B CN201510571440.7A CN201510571440A CN105098364B CN 105098364 B CN105098364 B CN 105098364B CN 201510571440 A CN201510571440 A CN 201510571440A CN 105098364 B CN105098364 B CN 105098364B
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- rear shell
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Abstract
The invention discloses a kind of NFC antenna structure based on metal rear shell, including a metal rear shell and an aerial coil, the aerial coil is arranged on the inside of metal rear shell, it is characterized in that, a part for the aerial coil extends metal rear shell without overlapping with metal rear shell, and the part is double-decker.Coil inside metal rear shell is moved to NFC antenna caused negative effect in itself by setting double-decker to eliminate from empty regions, antenna performance is improved, meanwhile, it can effectively reduce NFC antenna space shared in clearance zone, it is simple with model structure, the features such as superior performance.
Description
Technical field
The present invention relates to a kind of antenna structure, more particularly to a kind of NFC antenna structure based on metal rear shell.
Background technology
With the development of mobile device near field communication (NFC) function at this stage, (Near Field Communicat ion are near by NFC
Apart from wireless communication technique) function will be configured in more handheld devices, and then promote studying to NFC antenna design
Pay attention to increasing.In traditional NFC antenna application, it is typically chosen and FPC, i.e. NFC antenna radiant body is placed on battery
Above, while in order to reduce negative effect of the battery for NFC antenna, it is necessary to add lastblock ferrite among FPC and battery.
The bonnet that above-mentioned NFC antenna design is appropriate only for handheld device is the situation of non-metallic material.But in the recent period with disappearing
The favor of the person of expense, the mobile device with metal rear shell come into vogue, and this brings bigger difficulty to the design of NFC antenna.Cause
When NFC antenna coil is located completely on the inside of complete metal shell, will not only to be produced and NFC days in metal rear shell
The vortex that line current is completely reversed, and because shielding action of the metal rear shell to electromagnetic field to be placed on inside metal-back
NFC antenna can not be detected on the outside of metal rear shell.
After some appropriate processing are carried out to metal rear shell, for example, village field patent CN102405556B proposed
A through hole and one are opened in metal rear shell from through hole to the gap at metal rear shell edge.The gap " cut-out " is original in gold
The vortex that is completely reversed caused by category rear shell so that the vortex become with antenna current it is in the same direction have positive effect to antenna
Effectively vortex.It is this to overcome shielding of the above-mentioned metal rear shell to NFC antenna by being effectively vortexed in the same direction caused by cracked gap
Effect so that NFC antenna can be detected on the outside of metal rear shell.Although solved by the method in opened hole and gap
Shielding action of the metal rear shell to NFC antenna, but the through hole opened and gap still have impact on the integrality of metal rear shell, this
Destruction of the kind to metal rear shell integrality undoubtedly have impact on the aesthetic feeling and intensity of metal fuselage equipment.
Research in terms of the feasible NFC antenna based on metal rear shell for that can keep metal rear shell integrality so far is also
It is considerably less.The mode of generally use is by the way that at least half of part of NFC antenna coil is displaced to the outer of metal rear shell at present
Portion solves or eliminated shielding action of the metal rear shell to NFC antenna, as shown in figure 1, the outside of metal rear shell mentioned here
The space generally referred to as retained by the other principal antennas of handheld device, namely usually said principal antenna clearance zone.It is right
For handheld device such as mobile phone, the appearance design person of equipment expects to go to reduce the space shared by clearance zone as far as possible.But upper
State in NFC antenna design, in order to ensure to eliminate shielding action of the metal rear shell to NFC antenna, NFC antenna coil is had to
In intrusion clearance zone narrow and small already for principal antenna and other elements.In addition, the intrusion of NFC antenna coil not only can
Have influence on the performance of principal antenna and the design difficulty of principal antenna can be increased, therefore, optimal scheme is to subtract as far as possible
Few NFC antenna space shared in clearance zone.
In the traditional approach based on complete metal rear shell, the first half of NFC antenna is arranged on to the outside of metal rear shell,
I.e. in clearance zone, lower half is arranged on the lower section or inner side of metal rear shell, in order to effectively and farthest utilize after metal
The caused positive effect being vortexed to antenna, the lower half of aerial coil need to remain at the inner side of metal rear shell on shell,
But NFC antenna coil is excessive in the region shared by clearance zone.
Obviously, it is as shown in Fig. 2 simple and directly to reduce NFC antenna coil in the method that clearance zone is taken up space be handle
NFC antenna coil moves down from clearance zone, i.e., some antennas coil of the first half is moved to inside metal rear shell.Antenna sheet
The electric current of body is counterclockwise, according to near-field coupling principle, the aerial coil being in close contact with metal rear shell all will be in metal
Its corresponding vortex loop is produced in rear shell.Fig. 3 is that caused vortex is divided in metal rear shell by the coil of antenna lower half
Butut, Fig. 4 are the coil being in close contact by the antenna first half with metal rear shell caused Eddy Distribution figure in metal rear shell.
According to the right-hand rule, the vortex loop direction in Fig. 3 is identical with the sense of current of NFC antenna coil namely performance to antenna has
The effect of enhancing, and vortex loop direction in Fig. 4 is opposite with the sense of current of NFC antenna coil namely performance to antenna has
The effect of weakening.Although small by the positive vortex loop in reverse swirl ratio Fig. 3 in Fig. 4, different vortex loops life in other words
The effect of the magnetic flux superposition of production is still forward direction, but the vortex loop that the performance of NFC antenna entirety will be undoubtedly reversed
Weaken.
The content of the invention
The technical problems to be solved by the invention are：There is provided a kind of occupancy empty regions suitable for metal shell it is small and
High performance NFC antenna structure.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of NFC antenna based on metal rear shell
Structure, including a metal rear shell and a NFC antenna coil, the aerial coil are arranged on the inside of metal rear shell, the antenna line
Circle includes antenna Part I and antenna Part II, the antenna Part II extend metal rear shell without with metal rear shell
It is overlapping, and the antenna Part II is double-decker.
The beneficial effects of the present invention are：By setting double-decker, ensure after being moved to metal out of empty regions
Coil on the inside of shell can be placed in empty regions again, eliminate the line being moved to from empty regions on the inside of metal rear shell
Circle improves antenna performance to NFC antenna caused negative effect in itself, meanwhile, without opened in metal rear shell any through hole and
Gap, the integrality of metal rear shell is ensure that, metal rear shell is integrally formed, and processing technology is simple.
Brief description of the drawings
Fig. 1 is based on complete metal rear shell NFC antenna structural representation for tradition；
Fig. 2 is taken up space the antenna structure view after being reduced by NFC antenna in empty regions；
Fig. 3 is coil caused Eddy Distribution figure in metal rear shell in NFC antenna lower half in Fig. 2；
Fig. 4 is Eddy Distribution figure caused by the coil overlapping with metal rear shell of the NFC antenna first half in Fig. 2；
Fig. 5 is the NFC antenna structure chart of the embodiment of the present invention one；
Fig. 6 is Distribution of Magnetic Field figure of the NFC antenna outside away from metal rear shell at 25 millimeters in Fig. 2；
Fig. 7 is Distribution of Magnetic Field figure of the embodiment of the present invention one outside away from metal rear shell at 25 millimeters；
Fig. 8 is the NFC antenna structure chart of the embodiment of the present invention two.
Label declaration：1st, NFC antenna coil；2nd, metal rear shell；3rd, empty regions；4th, antenna Part I；5th, antenna
Two parts.
Embodiment
To describe the technology contents of the present invention, the objects and the effects in detail, below in conjunction with embodiment and coordinate attached
Figure is explained in detail.
The design of most critical of the present invention is：It is moved to by setting double-decker to eliminate from clearance zone in metal rear shell
The coil of side is to NFC antenna caused negative effect in itself.
Referring to Fig. 5, a kind of NFC antenna structure based on metal rear shell, including a metal rear shell 2 and a NFC antenna line
Circle 1, the aerial coil 1 are arranged on the inner side of metal rear shell 2, and the aerial coil includes antenna Part I 4 and antenna second
Part 5, the antenna Part II 5 extend metal rear shell 2 without overlapping with metal rear shell 2, and the antenna Part II 5
For double-decker.
Further, whole aerial coil 1 is double-decker.
Seen from the above description, the beneficial effects of the present invention are：By setting double-decker to ensure out of empty regions 3
Being moved to the coil of the inner side of metal rear shell 2 can be placed in empty regions 3 again, so as to eliminate from the quilt of empty regions 3
The coil of the inner side of metal rear shell 2 is moved to NFC antenna caused negative effect in itself, antenna performance is improved, there is model knot
Structure is simple, the features such as superior performance.
Further, the aerial coil 1 is rectangle or ellipse.
Further, the Breadth Maximum of the antenna Part II 5 is less than the Breadth Maximum of antenna Part I 4.
Further, the loop length of the antenna Part II 5 is the half of the total coil length of aerial coil 1.
Further, the loop length of the antenna Part II 5 is less than the one of the total coil length of aerial coil 1
Half.
Seen from the above description, the beneficial effects of the present invention are：It is small to take empty regions 3, reduces to principal antenna
The influence of energy and design difficulty.
Embodiment one
Fig. 5 is refer to, embodiments of the invention one are：A kind of NFC antenna structure based on metal rear shell, is applicable to hand
The mobile devices such as machine, palm PC, MP3 player, including a metal rear shell 2 and an aerial coil 1, in the metal rear shell 2
Side is empty regions 3, and the aerial coil 1 includes antenna Part I 4 and antenna Part II 5, the antenna Part I 4
Be arranged at the inner side of metal rear shell 2 with antenna Part II 5, but the antenna Part II 5 extend metal rear shell 2 without
It is overlapping with metal rear shell 2, and the antenna Part II 5 is double-decker, that is to say, that if aerial coil 1 is 8 altogether
Circle, then the Part II 5 divide for the double-layer structure of every layer of each 4 circle；The as shown in Figure 5 aerial coil 1 is rectangle, the antenna
Part II 5 is all coils part on the rectangle wherein one side, and the most inner coil on described one side of antenna Part II 5
It is corresponding with the edge of metal rear shell 2；Optionally, the antenna Part II 5 can also be the half or less than one of whole coil
Half, such as, whole coil can move up a part in Fig. 5, that is to say, that the loop length of the antenna Part II 5 can be with
Equal to or less than the half of the total coil length of aerial coil 1.Further alternative, the aerial coil 1 can also be circle
Shape, ellipse etc., if ensure that a portion extends metal rear shell 2, and the part is double-decker.Due to bilayer
Structure can take less area, therefore the Breadth Maximum of antenna Part II can be less than the maximum width of antenna Part I
Degree.
It refer to Fig. 6 and Fig. 7, magnetic of the Fig. 6 for NFC antenna in the structure shown in Fig. 2 at away from 25 millimeters outside metal rear shell 2
Field pattern, Fig. 7 are Distribution of Magnetic Field figure of the present embodiment at away from 25 millimeters outside metal rear shell 2.NFC antenna communication distance,
That is the evaluation index of the performance of antenna is determined by the size of the magnetic flux in the coil being coupled with the NFC antenna coil,
And the size of this magnetic flux will have with peak value size of the magnetic field of NFC antenna at the coil being coupled with it and width
Close；That is peak value size that can not be only with the magnetic field of NFC antenna in this place is fine or not to evaluate the performance of the NFC antenna.From
The peak value that field intensity map in Fig. 6 and Fig. 7 can be seen that either which kind of situation NFC antenna only has one, that is to say, that
NFC antenna only has a pattern.But test result indicates that, compared with the prior art shown in Fig. 2, the day line-spacing of the present embodiment
From improving 25%.Moreover, the number of turn that NFC antenna coil 1 is moved to metal rear shell 2 is more, the elevated effect of antenna performance
It is more obvious.
Embodiment two
Embodiments of the invention two and the difference of embodiment one are that whole aerial coil 1 is double-decker, that is,
Say, antenna Part I 4 and antenna Part II 5 are disposed as bilayer formation, as shown in Figure 8.NFC antenna in embodiment one
There is double-decker in the subrange of clearance zone, in order to realize the double-decker in the subrange, between all bilayers
Via will be emitted in this relatively narrow and small regional area；Such via discharging modes are especially narrow and small when regional area
When will increase the difficulty of via discharge, NFC antenna all made bilayer by the present embodiment in whole region, and now via can be more
Easily it is emitted on by distribution in the region of whole NFC antenna, meanwhile, made of above two difference double-decker mode
The maximum gauge of NFC antenna is identical, but the present embodiment can effectively reduce the overall dimensions of aerial coil.
In summary, the NFC antenna structure provided by the invention based on metal rear shell, by setting double-decker, can have
Effect ground reduces NFC antenna space shared in clearance zone so that the small headroom NFC antenna of high-performance based on complete metal rear shell
It is possibly realized.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalents that bright specification and accompanying drawing content are made, or the technical field of correlation is directly or indirectly used in, similarly include
In the scope of patent protection of the present invention.
Claims (5)
1. a kind of NFC antenna structure based on metal rear shell, including a metal rear shell and an aerial coil, the aerial coil are set
Put on the inside of metal rear shell, it is characterised in that：The aerial coil includes antenna Part I and antenna Part II, the day
Line Part II extends metal rear shell without overlapping with metal rear shell, and the antenna Part II is double-decker；It is described
Antenna Part I is single layer structure.
2. NFC antenna structure according to claim 1, it is characterised in that：The aerial coil is rectangle or ellipse.
3. NFC antenna structure according to claim 1, it is characterised in that：The Breadth Maximum of the antenna Part II is small
In the Breadth Maximum of antenna Part I.
4. NFC antenna structure according to claim 1, it is characterised in that：The loop length of the antenna Part II is
The half of the aerial coil total coil length.
5. NFC antenna structure according to claim 1, it is characterised in that：The loop length of the antenna Part II is small
In the half of the aerial coil total coil length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510571440.7A CN105098364B (en) | 2015-09-09 | 2015-09-09 | NFC antenna structure based on metal rear shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510571440.7A CN105098364B (en) | 2015-09-09 | 2015-09-09 | NFC antenna structure based on metal rear shell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105098364A CN105098364A (en) | 2015-11-25 |
| CN105098364B true CN105098364B (en) | 2018-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510571440.7A Active CN105098364B (en) | 2015-09-09 | 2015-09-09 | NFC antenna structure based on metal rear shell |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105161824B (en) * | 2015-08-28 | 2018-05-08 | 魅族科技（中国）有限公司 | A kind of antenna assembly and communication terminal |
| CN105490014A (en) * | 2016-01-07 | 2016-04-13 | 珠海格力电器股份有限公司 | FPC antenna and mobile phone |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646866A (en) * | 2012-04-17 | 2012-08-22 | 中兴通讯股份有限公司 | Near field communication (NFC) antenna and terminal equipment |
| CN104821438A (en) * | 2014-01-31 | 2015-08-05 | Tdk株式会社 | Antenna device and portable electronic device using the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8264342B2 (en) * | 2008-10-28 | 2012-09-11 | RF Surgical Systems, Inc | Method and apparatus to detect transponder tagged objects, for example during medical procedures |
| CN201515004U (en) * | 2009-08-28 | 2010-06-23 | 中兴通讯股份有限公司 | Antenna device of near-field communication electronic terminal |
| US8610638B2 (en) * | 2011-01-17 | 2013-12-17 | Nokia Corporation | FM transmission using a RFID/NFC coil antenna |
| CN204966701U (en) * | 2015-09-09 | 2016-01-13 | 深圳市信维通信股份有限公司 | NFC antenna structure based on metal backshell |
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2015
- 2015-09-09 CN CN201510571440.7A patent/CN105098364B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646866A (en) * | 2012-04-17 | 2012-08-22 | 中兴通讯股份有限公司 | Near field communication (NFC) antenna and terminal equipment |
| CN104821438A (en) * | 2014-01-31 | 2015-08-05 | Tdk株式会社 | Antenna device and portable electronic device using the same |
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| CN105098364A (en) | 2015-11-25 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20160115 Address after: 518000 Guangdong Province, Shenzhen city Baoan District manhole Street Xihuan Road No. 1013, building B, A Applicant after: Shenzhen Sunway Communication Co., Ltd. Applicant after: SHANGHAI XINWEI LANPEI NEW MATERIAL TECHNOLOGY CO., LTD. Address before: 518000 Guangdong Province, Shenzhen city Baoan District manhole Street Xihuan Road No. 1013, building B, A Applicant before: Shenzhen Sunway Communication Co., Ltd. |
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