CN204966701U - NFC antenna structure based on metal backshell - Google Patents
NFC antenna structure based on metal backshell Download PDFInfo
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- CN204966701U CN204966701U CN201520696472.5U CN201520696472U CN204966701U CN 204966701 U CN204966701 U CN 204966701U CN 201520696472 U CN201520696472 U CN 201520696472U CN 204966701 U CN204966701 U CN 204966701U
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Abstract
The utility model discloses a NFC antenna structure based on metal backshell, including a metal backshell and an antenna coil, antenna coil sets up at the metal backshell inboardly, its characterized in that, some of antenna coil is extended the metal backshell and is not overlapped with the metal backshell, just partly bilayer structure that is. Eliminate and to be removed the negative effects that the inside coil pair NFC antenna of metal backshell itself produced from the headroom region through setting up bilayer structure, improve antenna performance, simultaneously, can reduce NFC antenna shared space in the headroom is distinguished effectively, have model simple structure, characteristics such as superior performance.
Description
Technical field
The utility model relates to a kind of antenna structure, particularly relates to a kind of NFC antenna structure based on metal back cover.
Background technology
Along with the development of present stage mobile device near field communication (NFC) function, NFC (NearFieldCommunication near field communication (NFC)) function will be configured in more handheld device, and then impel the research to NFC antenna designs more and more to be paid attention to.In the application of traditional NFC antenna, generally select FPC, namely NFC antenna radiant body is placed on above battery, simultaneously in order to reduce the negative effect of battery for NFC antenna, needs to add lastblock ferrite in the middle of FPC and battery.The bonnet that above-mentioned NFC antenna design is only suitable for handheld device is the situation of non-metallic material.But in the recent period along with the favor of consumer, the mobile device with metal back cover comes into vogue, this brings larger difficulty to the design of NFC antenna.Because when NFC antenna coil is located completely inside complete metal shell, not only metal back cover will produce and the completely reverse eddy current of NFC antenna electric current, and the NFC antenna be placed on inside metal-back cannot be detected outside metal back cover due to the shielding action of metal back cover to electromagnetic field.
After carrying out some suitable process to metal back cover, what such as field, village proposed at patent CN102405556B opens a through hole and one from through hole to the gap at metal back cover edge on metal back cover.This gap " has cut off " original completely reverse eddy current produced on metal back cover, and this eddy current is become and antenna current effective eddy current antenna being had to positive effect in the same way.This due to cracked gap cause in the same way effectively eddy current overcome above-mentioned metal back cover to the shielding action of NFC antenna, NFC antenna can be detected in the outside of metal back cover.Although solve the shielding action of metal back cover to NFC antenna by the method opening hole and gap, but the through hole opened and gap still have impact on the integrality of metal back cover, this destruction to metal back cover integrality have impact on aesthetic feeling and the intensity of metal fuselage equipment undoubtedly.
Research so far for the feasible NFC antenna aspect based on metal back cover that can keep metal back cover integrality is also considerably less.The mode adopted at present is usually that the shielding action of metal back cover to NFC antenna is solved or eliminated in the outside by the part of NFC antenna coil at least half being displaced to metal back cover, as shown in Figure 1, the outside of metal back cover mentioned here generally refers to the space for other principal antenna of handheld device retains, also namely usually said principal antenna headroom district.For handheld device as mobile phone, the appearance design person of equipment expects to go to reduce the space shared by headroom district as far as possible.But in above-mentioned NFC antenna design, in order to ensure to eliminate metal back cover to the shielding action of NFC antenna, NFC antenna coil has to invade in headroom district narrow and small already for principal antenna and other element.In addition, the intrusion of NFC antenna coil not only can have influence on the performance of principal antenna but also can increase the design difficulty of principal antenna, and therefore, optimal scheme reduces NFC antenna space shared in headroom district as far as possible.
In the traditional approach based on complete metal back cover, the first half of NFC antenna is arranged on the outside of metal back cover, namely in headroom district, Lower Half is arranged on below or the inner side of metal back cover, in order to effectively and farthest utilize the eddy current produced on metal back cover to the positive effect of antenna, the Lower Half of aerial coil needs the inner side remaining at metal back cover, but the region of NFC antenna coil shared by headroom district is excessive.
Obviously, as shown in Figure 2, simply and directly reducing NFC antenna coil is that NFC antenna coil is moved down from headroom district in the method that headroom district takes up space, and it is inner that the some antennas coil by the first half moves to metal back cover.The electric current of antenna itself is counterclockwise, according to near-field coupling principle, all will produce its corresponding eddy current loop on metal back cover with the aerial coil of metal back cover close contact.To be the Eddy Distribution figure produced on metal back cover by the coil of antenna Lower Half, Fig. 4 be Fig. 3 by the Eddy Distribution figure produced on metal back cover with the coil of metal back cover close contact of the antenna first half.According to the right-hand rule, direction, the eddy current loop effect that also namely the performance of antenna had to enhancing identical with the sense of current of NFC antenna coil in Fig. 3, and direction, the eddy current loop effect that also namely the performance of antenna had to weakening contrary to the sense of current of NFC antenna coil in Fig. 4.Although little by the forward eddy current loop in the reverse swirl ratio Fig. 3 in Fig. 4, different eddy current loops produce in other words the effect of magnetic flux superposition remains forward, and the eddy current loop be reversed is weakened by the performance of NFC antenna entirety undoubtedly.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of be applicable to metal shell take the little and high performance NFC antenna structure of empty regions.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of NFC antenna structure based on metal back cover, comprise a metal back cover and a NFC antenna coil, described aerial coil is arranged on inside metal back cover, described aerial coil comprises antenna Part I and antenna Part II, described antenna Part II extends metal back cover and not overlapping with metal back cover, and described antenna Part II is double-decker.
Further, whole aerial coil is double-decker.
Further, described aerial coil is rectangle or ellipse.
Further, the Breadth Maximum of described antenna Part II is less than the Breadth Maximum of antenna Part I.
Further, the loop length of described antenna Part II is the half of described aerial coil total coil length.
Further, the loop length of described antenna Part II is less than the half of described aerial coil total coil length.
The beneficial effects of the utility model are: by arranging double-decker, ensure that the coil be moved in empty regions inside metal back cover can be placed in empty regions again, eliminate and be moved to from empty regions the negative effect that the coil inside metal back cover produces NFC antenna itself, improve antenna performance, meanwhile, without the need to opening any through hole and gap on metal back cover, ensure that the integrality of metal back cover, metal back cover is one-body molded, and processing technology is simple.
Accompanying drawing explanation
Fig. 1 is that tradition is based on complete metal back cover NFC antenna structural representation;
Fig. 2 for NFC antenna in empty regions the antenna structure view after being reduced that takes up space;
Fig. 3 is the Eddy Distribution figure that in Fig. 2, NFC antenna Lower Half coil produces on metal back cover;
Fig. 4 is the Eddy Distribution figure that coil that in Fig. 2, the NFC antenna first half is overlapping with metal back cover produces;
Fig. 5 is the NFC antenna structure chart of the utility model embodiment one;
Fig. 6 is the Distribution of Magnetic Field figure at NFC antenna 25 millimeters of places outside distance metal back cover in Fig. 2;
Fig. 7 is that the utility model embodiment one is at the Distribution of Magnetic Field figure apart from the outer 25 millimeters of places of metal back cover;
Fig. 8 is the NFC antenna structure chart of the utility model embodiment two.
Label declaration: 1, NFC antenna coil; 2, metal back cover; 3, empty regions; 4, antenna Part I; 5, antenna Part II.
Embodiment
By describing technology contents of the present utility model in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with execution mode.
The design of the utility model most critical is: eliminate by arranging double-decker the negative effect being moved to the coil inside metal back cover from headroom district and producing NFC antenna itself.
Refer to Fig. 5, a kind of NFC antenna structure based on metal back cover, comprise metal back cover 2 and a NFC antenna coil 1, described aerial coil 1 is arranged on inside metal back cover 2, described aerial coil comprises antenna Part I 4 and antenna Part II 5, described antenna Part II 5 extends metal back cover 2 and not overlapping with metal back cover 2, and described antenna Part II 5 is double-decker.
Further, whole aerial coil 1 is double-decker.
Seen from the above description, the beneficial effects of the utility model are: ensure that the coil be moved in empty regions 3 inside metal back cover 2 can be placed in empty regions 3 again by arranging double-decker, thus eliminate and be moved to from empty regions 3 negative effect that the coil inside metal back cover 2 produces NFC antenna itself, improve antenna performance, there is model structure simple, the features such as superior performance.
Further, described aerial coil 1 is rectangle or ellipse.
Further, the Breadth Maximum of described antenna Part II 5 is less than the Breadth Maximum of antenna Part I 4.
Further, the loop length of described antenna Part II 5 is the half of described aerial coil 1 total coil length.
Further, the loop length of described antenna Part II 5 is less than the half of described aerial coil 1 total coil length.
Seen from the above description, the beneficial effects of the utility model are: take empty regions 3 little, reduce the impact on principal antenna performance and design difficulty.
Embodiment one
Please refer to Fig. 5, embodiment one of the present utility model is: a kind of NFC antenna structure based on metal back cover, be applicable to mobile phone, palmtop PC, the mobile devices such as MP3 player, comprise metal back cover 2 and an aerial coil 1, be empty regions 3 above described metal back cover 2, described aerial coil 1 comprises antenna Part I 4 and antenna Part II 5, described antenna Part I 4 and antenna Part II 5 are all arranged on inside metal back cover 2, but described antenna Part II 5 extends metal back cover 2 and not overlapping with metal back cover 2, and described antenna Part II 5 is double-decker, that is, if aerial coil 1 is altogether 8 circles, then this Part II 5 is divided into the double-layer structure of every layer of each 4 circle, described aerial coil 1 is rectangle as shown in Figure 5, and described antenna Part II 5 is described rectangle all coils parts wherein, and described antenna Part II 5 most inner coil is on one side corresponding with the edge of metal back cover 2, optionally, described antenna Part II 5 also can be the half of whole coil or fewer than half, such as, in Fig. 5, whole coil can move a part above, that is, the loop length of described antenna Part II 5 can be equal to or less than the half of described aerial coil 1 total coil length.Further alternative, described aerial coil 1 also can be circular, oval etc., as long as ensure that wherein a part extends metal back cover 2, and this part is double-decker.Because double-decker can take less area, therefore the Breadth Maximum of antenna Part II can be less than the Breadth Maximum of antenna Part I.
Please refer to Fig. 6 and Fig. 7, Fig. 6 is for NFC antenna in the structure shown in Fig. 2 is at the Distribution of Magnetic Field figure apart from metal back cover 2 outer 25 millimeters of Distribution of Magnetic Field figure located, Fig. 7 being the present embodiment 25 millimeters of places outside distance metal back cover 2.NFC antenna communication distance, namely also the evaluation index of the performance of antenna is determined by the size of the magnetic flux in the coil be coupled with this NFC antenna coil, and the peak value size of the magnetic field of the large young pathbreaker of this magnetic flux and NFC antenna at the coil place be coupled with it and width relevant; That is only can not evaluate the performance quality of this NFC antenna in the peak value size at this place with the magnetic field of NFC antenna.As can be seen from the field intensity map in Fig. 6 and Fig. 7, be no matter that the peak value of which kind of situation NFC antenna only has one, that is NFC antenna only has a pattern.But experimental result shows, compared with the prior art shown in Fig. 2, the antenna distance of the present embodiment improves 25%.And the number of turn that NFC antenna coil 1 is moved to metal back cover 2 is more, antenna performance is more obvious by the effect promoted.
Embodiment two
With the difference of embodiment one, embodiment two of the present utility model is that whole aerial coil 1 is double-decker, that is, antenna Part I 4 and antenna Part II 5 are all set to bilayer formation, as shown in Figure 8.In embodiment one, NFC antenna only has double-decker in the subrange in headroom district, and in order to realize the double-decker in this subrange, the via hole between all bilayers all will be emitted in this relatively narrow and small regional area; Such via hole discharging modes will increase the difficulty of via hole discharge when regional area is narrow and small especially, the present embodiment all makes bilayer NFC antenna in whole region, now via hole can relatively easily be distributed be emitted on whole NFC antenna region in, simultaneously, the maximum ga(u)ge of the NFC antenna made by above-mentioned two kinds of different double-decker modes is identical, but the present embodiment can reduce the overall dimensions of aerial coil effectively.
In sum, the NFC antenna structure based on metal back cover that the utility model provides, by arranging double-decker, effectively can reduce the space that NFC antenna is shared in headroom district, making the little headroom NFC antenna of high-performance based on complete metal back cover become possibility.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalents utilizing the utility model specification and accompanying drawing content to do; or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present utility model.
Claims (6)
1. the NFC antenna structure based on metal back cover, comprise a metal back cover and an aerial coil, described aerial coil is arranged on inside metal back cover, it is characterized in that: described aerial coil comprises antenna Part I and antenna Part II, described antenna Part II extends metal back cover and not overlapping with metal back cover, and described antenna Part II is double-decker.
2. NFC antenna structure according to claim 1, is characterized in that: whole aerial coil is double-decker.
3. NFC antenna structure according to claim 1, is characterized in that: described aerial coil is rectangle or ellipse.
4. NFC antenna structure according to claim 1, is characterized in that: the Breadth Maximum of described antenna Part II is less than the Breadth Maximum of antenna Part I.
5. NFC antenna structure according to claim 1 and 2, is characterized in that: the loop length of described antenna Part II is the half of described aerial coil total coil length.
6. NFC antenna structure according to claim 1 and 2, is characterized in that: the loop length of described antenna Part II is less than the half of described aerial coil total coil length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520696472.5U CN204966701U (en) | 2015-09-09 | 2015-09-09 | NFC antenna structure based on metal backshell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520696472.5U CN204966701U (en) | 2015-09-09 | 2015-09-09 | NFC antenna structure based on metal backshell |
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| Publication Number | Publication Date |
|---|---|
| CN204966701U true CN204966701U (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520696472.5U Active CN204966701U (en) | 2015-09-09 | 2015-09-09 | NFC antenna structure based on metal backshell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098364A (en) * | 2015-09-09 | 2015-11-25 | 深圳市信维通信股份有限公司 | NFC (Near Field Communication) antenna structure based on metal back shell |
| CN110247162A (en) * | 2019-06-30 | 2019-09-17 | RealMe重庆移动通信有限公司 | Decoration and electronic equipment |
-
2015
- 2015-09-09 CN CN201520696472.5U patent/CN204966701U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098364A (en) * | 2015-09-09 | 2015-11-25 | 深圳市信维通信股份有限公司 | NFC (Near Field Communication) antenna structure based on metal back shell |
| CN110247162A (en) * | 2019-06-30 | 2019-09-17 | RealMe重庆移动通信有限公司 | Decoration and electronic equipment |
| CN110247162B (en) * | 2019-06-30 | 2021-03-02 | RealMe重庆移动通信有限公司 | Decoration and electronic device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160113 Address after: 518000 Guangdong Province, Shenzhen city Baoan District manhole Street Xihuan Road No. 1013, building B, A Patentee after: Shenzhen Sunway Communication Co., Ltd. Patentee 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 Patentee before: Shenzhen Sunway Communication Co., Ltd. |