CN105071022B - A kind of near field communication antenna device - Google Patents
A kind of near field communication antenna device Download PDFInfo
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- CN105071022B CN105071022B CN201510477120.5A CN201510477120A CN105071022B CN 105071022 B CN105071022 B CN 105071022B CN 201510477120 A CN201510477120 A CN 201510477120A CN 105071022 B CN105071022 B CN 105071022B
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- conductor
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Abstract
The present invention provides a kind of near field communication antenna devices, belong to wireless communication field.The antenna assembly is the antenna assembly constituted in mobile electronic device, comprising: shell conductor layer, insulating layer, coil-conductor, flexible base board and magnetic material layer；Coil-conductor is using winding center portion as the ring-type in coil aperture portion or spiral coil, and magnetic material is assembled in the flexible base board other side depended on it；Shell conductor layer, which blocks coil-conductor, is divided into two regions: first area is non-shell conductor layer shield portions, the i.e. practical magnetic link coupling unit of antenna, which is covered using magnetic material, to improve the magnetic field radiation ability of antenna；Second area is shell conductor layer shield portions, the region does not use magnetic material to cover, and to reduce the ohmic loss of the antenna brought by magnetic material is lost, and reduces the magnetic density in the region, eddy-current loss brought by conductor layer is reduced simultaneously, improves the reading/writing distance of antenna assembly.
Description
Technical field
The present invention relates to a kind of in the RFID system communicated by electromagnetic field signal and counterpart device, NFC system, short
The antenna assembly used in the near-field communications system.
Background technique
In recent years, with the continuous popularization and use of RFID system and NFC system, in order between mobile electronic device or mobile
It is communicated between electronic equipment and basic card-reading apparatus, in each equipment, especially hand-held mobile electronic equipment is mounted with NFC system
The communication antenna of system.Existing RFID or NFC antenna are designed as 3 to 4 circles due to line width more, are assemblied in movement and set
Standby interior of shell.With the appearance for being equipped with metal shell mobile electronic device, the use of mobile electronic device greatly improved
The wearability of service life and device housings provides better experience for user.But metal shell is as a kind of good conductor, it is right
Electromagnetic wave has shielding action, will lead near field antenna reading/writing distance and declines to a great extent.
A kind of antenna assembly is provided in the patent that Authorization Notice No. is CN 102405556B to be covered by larger area conductor layer
In the case where lid, conductor layer is solved to a kind of method of communication blocking electromagnetic waves.The antenna structure uses and is being covered in antenna table
The mode of the conductor layer aperture in face provides magnetic circuit window for communication electromagnetic field, and covers in conductor layer window with communication antenna
Gap is opened in cover area addition, reduces influence of the vortex to communication electromagnetic field in conductor layer, to achieve the effect that improve communication distance.But
The program has the following problems: first, the structure needs the aperture in the conductor layer of covering antenna, and needing in hole side
Gap is carried out out, destroys the integrality of conductor layer in structure in this way, if the design of its shell mechanism of mobile device does not allow aperture
Gap is opened to destroy its complete appearance or structural support properties, then the structure will receive very big application limitation；Second, the structure
In, electromagnetic field caused by antenna need to bypass conductor layer, and for electromagnetic field during bypassing conductor layer, conductor layer will be to electromagnetic field
Cause greater attenuation, attenuation degree is related to the conductor layer length that it is bypassed, therefore the structure in antenna mount in wider conductor
Layer, i.e., in the biggish mobile device terminal of metal shell, communication effect will be affected.
Summary of the invention
The present invention provides a kind of near field communication antenna device for defect existing for background technique.The antenna assembly can
Under conditions of not destroying the metal structure of mobile electronic device casing, telecommunication is realized；And the magnetic material used is few,
The space occupied is small.
Technical scheme is as follows:
Antenna assembly of the invention is the antenna assembly constituted in the electronic device, comprising: shell conductor layer, insulating layer,
Coil-conductor, flexible base board and magnetic material layer；
Coil-conductor, using winding center portion as the ring-type in coil aperture portion or spiral coil, the flexibility depended on it
Assemble magnetic material in the substrate other side；
Insulating layer is formed in the coil-conductor surface, coil-conductor is avoided to be connected with shell conductor layer；
Flexible base board, supports the baseplate material of coil-conductor, and coil-conductor is formed on flexible base board；
Magnetic material layer is configured at side of the flexible base board far from coil-conductor；
Shell conductor layer, the conductor layer are the metal part of composition mobile electronic device casing and part structural support, or
The conductor layer is formed in shell inner surface or the outer surface of the electronic equipment of assembling object；The shell conductor layer is configured at than institute
Stating coil-conductor will be close to the side of the antenna of communication other side side；
When overlooking the antenna assembly, shell conductor layer portion covers coil-conductor area encompassed, i.e. shell is led
Body layer is divided into two regions after blocking coil-conductor area encompassed: first area is non-shell conductor layer shield portions,
The magnetic material layer completely or partially covers the region；Second area is shell conductor layer shield portions, the magnetic material
Part covers or does not cover completely the region.
Further, the magnetic material all covers first area or covers most of space of first area；It is described
Magnetic material does not cover second area completely or covers the fraction space of second area.
Further, the coil-conductor is drawn with contact outside electronics point by its end self-assembling formation or wire jumper form outward
It is formed out.
Further, settable hole in the shell conductor layer, described hole are set to the region of coil-conductor covering
It is interior, and its edge is completely not interrupted out gap.
Further, in the case where shell conductor layer determines, antenna assembly resonance frequency is higher than the center of working frequency
Frequency.
The second area that shell conductor layer covers in the present invention by shell conductor layer because blocked, and the region is not to outside
Spatial emission electromagnetic field, therefore the region does not use magnetic material covering or most of region not to use magnetic material to cover, substantially
Degree reduces the region interior loop conductor because of ohmic loss caused by magnetic material, and reduces the covering of shell conductor layer
Magnetic density in region reduces eddy-current loss brought by shell conductor layer；Without using the of the covering of shell conductor layer
One region is the part of antenna actual emanations, which is covered using magnetic material, because magnetic material is good magnetic field-enhanced
Effect, can greatly improve the magnetic field radiation effect in the region.
The invention has the benefit that
1, antenna assembly of the present invention will not destroy the structural intergrity of mobile device housing metallic portion, in this way can be big
The design space of width lift structure engineer, is moved easily the design of equipment.
2, inventive antenna device only takes up lesser space, because of the not outside spoke of coil-conductor of shell conductor layer covering
Radio magnetic wave can be designed the antenna structure compared with small area so not needing very large space.
3, inventive antenna device realizes the near-field communication of metal shell equipment, and its communication distance can reach substantially it is non-
Metal shell equipment near-field communication distance.
4, the present invention uses new magnetic material assembling structure, using the method for different zones difference covering, is reducing magnetic
Property material utilization amount, save cost while, improve the radiation effect of antenna assembly.
Detailed description of the invention
Fig. 1 is the rearview of a kind of electronic equipment provided by the invention, wherein shell conductor layer 6 and coil-conductor 1 and magnetic
Property material 2 carry out perspective processing, i.e., by shell conductor layer 6 it can be seen that coil-conductor 1 and magnetic material 2.
Fig. 2 is a kind of antenna assembly overlooking structure diagram provided by the invention, wherein shell conductor layer 6 and coil-conductor
1 and magnetic material 2 carry out perspective processing, i.e., by shell conductor layer 6 it can be seen that coil-conductor 1 and magnetic material 2.
Fig. 3 is the diagrammatic cross-section along the face X-X ' of the antenna assembly of Fig. 2.
Fig. 4 is the distribution map in magnetic field in inventive antenna device.
Fig. 5 is the electronic equipment rearview in embodiment 2, wherein shell conductor layer 6 and coil-conductor 1 and magnetic material 2
Perspective processing is carried out, i.e., by shell conductor layer 6 it can be seen that coil-conductor 1 and magnetic material 2.
Wherein, L3 is the shell conductor layer top edge of electronic equipment and the spacing of middle layer top edge, and SA is electronic equipment
Interlayer structure top edge, 1 is coil-conductor, and 2 be magnetic material, and 3 be the non-shell conductor layer overlying portions of coil-conductor, and 4 are
For coil-conductor by shell conductor layer overlying portions, 5 be middle layer, the interlayer structure of electronic equipment, predominantly conductor module group
At, 6 be shell conductor layer, i.e. conductor part in electronic equipment casing, and 7 be camera of electronic equipment part, and 8 be flexible base board, 9
For insulating layer.
Specific embodiment
Technical solution of the present invention is described in detail in referring to Fig.1~Fig. 5.
Fig. 1 be include antenna assembly involved in embodiment 1 mobile electronic device rearview, such as mobile phone.Electronics
The back side of equipment is directed towards the communication counterpart side i.e. one side of reader side antenna.As shown in Figure 1, in Fig. 1 after mobile electronic device
The conductor part of shell forms shell conductor layer 6, and shell conductor layer 6 can be formed by aluminium machine-shaping or metal plating, to protect electricity
Sub- equipment.Shell conductor layer 6 occupies most of area of entire electronic equipment casing；And because of support construction or beauty etc.
Reason is not easy to carry out aperture design wherein.The middle layer 5 of electronic equipment, this layer include the midfoot support knot of electronic equipment
Load module in structure and its structure, wherein load module includes electronic circuit board, battery, each communication and signal processing module
Etc. modules, the part be no lack of each metallic conductor class component.Middle layer 5 is spliced by the conductor element of large area, and by various
Support construction is formed by connecting.In the 5 top edge position SA of middle layer, it is often equipped with the main communication antenna of electronic equipment, due to
Main communication antenna need to be assembled to the position SA, so shell conductor layer 6 can not be completely covered middle layer 5, its spacing in Fig. 1 by
L3 indicates that L3 length is not more than 20mm.The top corner edge of middle layer 5 is provided with the position of installation camera, Fig. 1 mesoporous 7.This
Sample, without in shell conductor layer 6 aperture ensure that the structural intergrity of housing metallic portion to place camera lens.
Fig. 2 is a kind of overlooking structure diagram of antenna assembly provided by the invention, and Fig. 3 is the antenna assembly of Fig. 2 along X-
The diagrammatic cross-section in the face X '.By Fig. 2 and Fig. 3 it is found that antenna assembly of the present invention is followed successively by shell conductor layer 6 from outside to inside,
Insulating layer 9, coil-conductor 1, flexible base board 8, magnetic material 2, middle layer 5.Coil-conductor 1 shown in Fig. 2 is due to shell conductor layer 6
Presence, be classified as two parts.Wherein region 4 is 6 overlay areas of shell conductor layer, that is, second area, and region 3 is non-
6 overlay areas of shell conductor layer, that is, first area.Since region 4 is covered by shell conductor layer 6, which can not send out to outside
Out or electromagnetic wave is received, the electromagnetic wave inside region 4 is strapped in the metal environment inside shell conductor layer 6 and middle layer 5 completely
In, so not covering magnetic material or covering fraction magnetic material below the region coil-conductor, to reduce magnetic material
Ohmic loss caused by magnetic loss.Antenna assembly coil-conductor in region 3 is the portion for actually sending out or receiving electromagnetic wave
Point, magnetic material or most of covering magnetic material are covered below the region coil-conductor, all to improve the outside spoke of electromagnetic field
Penetrate effect.
Further, as in Fig. 3, magnetic material 2 is magnetic flakes, which is ferrite ceramics thin slice or resin
Type alloy powder fills thin slice.Its magnetic conductivity real part >=130 of magnetic material thin slice 2, magnetic conductivity imaginary part≤5.
In antenna assembly of the present invention, magnetic material 2 is bonded in middle layer 5, and the coil of belt surface insulation processing is led
The flexible base board of body 1 is bonded in shell conductor layer inner surface, when shell conductor layer is assemblied in electronic equipment surface, magnetic material
2 fit together with flexible base board.
In antenna assembly of the present invention, the line of magnetic material 2, belt surface insulation processing is successively bonded in middle layer 5
The flexible base board and shell conductor layer for enclosing conductor 1, obtain the antenna assembly in electronic equipment of the present invention.
The Distribution of Magnetic Field figure of inventive antenna device is as shown in figure 4, MFa partial magnetic field is that shell conductor layer 6 is not covered in figure
The magnetic field that the coil-conductor of lid generates, the part are outside radiation field part, during which faces below conductor
The region of interbed 5 should cover magnetic material.MFb, MFc, MFd partial magnetic field are the coil-conductor that shell conductor layer 6 covers in figure
The magnetic field of generation, the partial magnetic field are strapped in completely between shell conductor layer 6 and middle layer 5, can not be to external radiation, the region line
Magnetic material is not covered below circle conductor, to reduce magnetic material to loss brought by antenna assembly.
Embodiment 1
40mm × 40mm area is made, the design of 4 circle of the line widths single-conductor such as common 0.8mm antenna, lower section is and conductor lines
The identical magnetic material of area is enclosed, and conductor coils surface non-housing conductor layer covers, and is denoted as ordinary antennas device；
Production antenna assembly area is 40mm × 40mm, non-magnetic material covering below 4 coil-conductor of region, and region 3 is complete
Portion is covered using magnetic material, and 6 part of shell conductor layer covers coil-conductor, and 3 width of region is 6mm, is denoted as inventive antenna
Device；
Production antenna assembly area be 40mm × 40mm, antenna pattern identical with inventive antenna device, 40mm ×
Magnetic material is assembled in 40mm antenna range, and shell conductor layer 6 same as the present invention is equally covered outside antenna assembly,
It is denoted as conductor layer covering ordinary antennas device.The communication effect of three kinds of different antennae devices is as follows:
By test comparison result it is found that antenna assembly of the invention can reach the ordinary antennas read-write energy of no conductor layer covering
The 80% of power has good communication effect.But if being designed using ordinary antennas, it is also fitted in large area conductor layer shell
Antenna assembly in equipment, reading/writing distance will decline to a great extent, therefore antenna assembly of the invention can play stronger promotion and read
Write the effect of distance.
Embodiment 2
Electronic equipment casing rear structure as shown in figure 5, the electronic equipment in comparison diagram 1 rear structure, difference exist
In having carried out aperture design in 6 part of shell conductor layer, position of opening selects at the center of antenna assembly coil conductor 1
Around vacant part, but its verge of opening is without interrupting to form gap.
The center ring of 6 part of shell conductor layer, the coil-conductor in antenna assembly carries out aperture around vacant part, with
Camera is installed, bigger electromagnetic wave is provided after aperture for antenna assembly and enters window, can further improve antenna assembly
Communication distance.
Claims (4)
1. a kind of near field communication antenna device, which is the antenna assembly constituted in the electronic device, which is characterized in that
Include:
Coil-conductor, using winding center portion as the ring-type in coil aperture portion or spiral coil；
Insulating layer is formed in the coil-conductor surface, coil-conductor is avoided to be connected with shell conductor layer；
Flexible base board, supports the baseplate material of coil-conductor, and coil-conductor is formed on flexible base board；
Magnetic material layer is configured at side of the flexible base board far from coil-conductor；
Shell conductor layer, the conductor layer be form mobile electronic device casing and part structural support metal part or this lead
Body layer is formed in shell inner surface or the outer surface of the electronic equipment of assembling object；The shell conductor layer is configured at than the line
Enclosing conductor will be close to the side of the antenna of communication other side side；
When overlooking the antenna assembly, shell conductor layer portion covers coil-conductor area encompassed, i.e. shell conductor layer
Be divided into two regions after coil-conductor area encompassed is blocked: first area is non-shell conductor layer shield portions, described
Magnetic material layer completely or partially covers the region；Second area is shell conductor layer shield portions, the magnetic material portion
Covering does not cover the region completely.
2. near field communication antenna device according to claim 1, which is characterized in that the coil-conductor connects with external circuit
It is drawn formed outward by its end self-assembling formation or wire jumper form in contact.
3. near field communication antenna device according to claim 1, which is characterized in that settable hole in the shell conductor layer
Hole, described hole is set in the region of coil-conductor covering, and its edge is complete.
4. a kind of electronic equipment, which is provided near field communication antenna device in the inner surface of shell or outer surface, should
Near field communication antenna device is near field communication antenna device described in any claim in claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510477120.5A CN105071022B (en) | 2015-08-06 | 2015-08-06 | A kind of near field communication antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510477120.5A CN105071022B (en) | 2015-08-06 | 2015-08-06 | A kind of near field communication antenna device |
Publications (2)
| Publication Number | Publication Date |
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| CN105071022A CN105071022A (en) | 2015-11-18 |
| CN105071022B true CN105071022B (en) | 2019-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510477120.5A Active CN105071022B (en) | 2015-08-06 | 2015-08-06 | A kind of near field communication antenna device |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576343B (en) * | 2016-01-25 | 2018-04-06 | 电子科技大学 | A kind of near field communication antenna device |
| JP7102097B2 (en) | 2016-03-01 | 2022-07-19 | 日東電工株式会社 | Magnetic film and coil module |
| CN106384879A (en) * | 2016-09-19 | 2017-02-08 | 安徽爱她有果电子商务有限公司 | Miniature and multifunctional electronic commerce equipment antenna |
| CN107871928A (en) * | 2016-09-26 | 2018-04-03 | 上海德门电子科技有限公司 | A kind of NFC communication antennas and NFC communication apparatus |
| CN106450684B (en) * | 2016-12-27 | 2023-12-05 | 深圳市中天迅通信技术股份有限公司 | Near field antenna device combined with metal shell |
| CN106785351A (en) * | 2016-12-30 | 2017-05-31 | 禾邦电子(苏州)有限公司 | A kind of mobile terminal and its NFC antenna |
| CN113131207A (en) * | 2021-03-25 | 2021-07-16 | 深圳市飞荣达科技股份有限公司 | Near field communication antenna device and mobile equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104737370A (en) * | 2012-10-17 | 2015-06-24 | 迪睿合电子材料有限公司 | Electronic device and coil module |
| CN204857935U (en) * | 2015-08-06 | 2015-12-09 | 电子科技大学 | Near field communications array device |
-
2015
- 2015-08-06 CN CN201510477120.5A patent/CN105071022B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104737370A (en) * | 2012-10-17 | 2015-06-24 | 迪睿合电子材料有限公司 | Electronic device and coil module |
| CN204857935U (en) * | 2015-08-06 | 2015-12-09 | 电子科技大学 | Near field communications array device |
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| CN105071022A (en) | 2015-11-18 |
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