CN105048061A - Near-field communication antenna device - Google Patents
Near-field communication antenna device Download PDFInfo
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- CN105048061A CN105048061A CN201510442911.4A CN201510442911A CN105048061A CN 105048061 A CN105048061 A CN 105048061A CN 201510442911 A CN201510442911 A CN 201510442911A CN 105048061 A CN105048061 A CN 105048061A
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Abstract
The invention belongs to the field of wireless communication and relates to an antenna device used in a short-distance wireless communication system. The antenna device is the antenna device formed in mobile electronic equipment, and comprises a coil conductor, a flexible substrate, a magnetic material and a housing conductor layer, wherein the coil conductor is an annular or helical coil employing a winding center part as a coil opening part; the coil conductor and the flexible substrate which is attached to the coil conductor are assembled on the surface of a magnetic sheet material; the coil conductor is shielded and divided into two areas by the housing conductor layer; the first area is a non-shielding part of the housing conductor layer, namely an actual magnetic link coupling part of the antenna; a narrow linewidth design is adopted by the coil conductor of the part or the narrow linewidth design is mainly adopted; a dual-conductor layer parallel design is adopted; the second area is a shielding part of the housing conductor layer; and a wide line design is adopted by the coil conductor of the area. The antenna device has the beneficial effects that the structural integrity of the metal part of a mobile equipment housing is not destroyed; the occupied space is small; and the performance is high.
Description
Technical field
The present invention relates to the antenna assembly used in a kind of rfid system being undertaken communicating by electromagnetic field signal and counterpart device, NFC system, short distance radio communication system.
Background technology
In recent years, along with constantly promoting the use of of rfid system and NFC system, especially NFC system applying in financial field.In order to carry out communication between mobile electronic device or between mobile electronic device and basic card-reading apparatus, in each equipment, especially hand-held mobile electronic equipment is mounted with the communication antenna of NFC system.Existing RFID or NFC antenna, due to live width, mostly are 3 to 4 circle designs, are assemblied in mobile device enclosure.Along with the appearance being equipped with metal shell mobile electronic device, significantly improve the useful life of mobile electronic device and the resistance to wear of device housings, for user provides better experience.But metal shell, as a kind of good conductor, has shielding action to electromagnetic wave, near field antenna reading/writing distance is declined to a great extent.
The patent of Authorization Notice No. CN102405556B, provides a kind of antenna assembly by under larger area conductor layer coverage condition, solves conductor layer to a kind of method of communication blocking electromagnetic waves.This antenna structure adopts and is being covered in the conductor layer perforate mode of antenna surface, for communication electromagnetic field provides magnetic circuit window, and add out gap at conductor layer window and communication antenna overlay area, in reduction conductor layer, eddy current is on the impact of communication electromagnetic field, to reach the effect improving communication distance.
But there is following problem in its solution provided: 1. program structure needs the conductor layer perforate at antenna cover, and need to carry out out gap in hole side, so structurally destroy the integrality of conductor layer, if the design of its shell mechanism of mobile device does not allow perforate to open gap to destroy its complete appearance or structural support properties, then namely the program is subject to very large application restriction; 2. in the program, the electromagnetic field that antenna produces need walk around conductor layer, electromagnetic field is in the process walking around conductor layer, conductor layer will cause comparatively high attenuation to electromagnetic field, attenuation degree is relevant to the conductor layer length that it is walked around, then the program is in antenna mount in wider conductor layer, and namely in the mobile device terminal that metal shell is larger, its effect will be affected.
Summary of the invention
For above-mentioned existing problems or deficiency, the invention provides a kind of near field communication antenna device, this antenna assembly can not destroy the metal structure of mobile electronic device casing, and occupies less space, realizes telecommunication.
Antenna assembly of the present invention is the antenna assembly formed in mobile electronic device, comprising: coil-conductor, flexible base, board, magnetic material and shell conductor layer.
Coil-conductor, using winding center portion as the ring-type in coil aperture portion or spiral coil, the flexible base, board depended on it is assemblied in magnetic flakes material surface.
Flexible base, board, the baseplate material of support coils conductor, coil-conductor is formed on flexible base, board.
Magnetic material, is assemblied in the side of coil-conductor away from shell conductor layer.
Shell conductor layer, this conductor layer is the metallic member of composition mobile electronic device casing and part structural support, or this conductor layer is formed at shell inner surface or the outer surface of the electronic equipment of assembly object; This conductor layer is configured at than the side of described coil-conductor near the antenna of communication the other side side.
When overlooking described antenna assembly, shell conductor layer partly need cover coil-conductor, namely coil-conductor blocks and is divided into two regions by shell conductor layer: first area is non-shell conductor layer shield portions, i.e. antenna actual magnetic link couples part, this part is actual aerial radiation part, this coil sections conductor adopts narrow linewidth design or major part to adopt narrow linewidth design, and this coil sections conductor uses two-conductor layer Parallel Design, realizes less ohmic loss; Second area is shell conductor layer shield portions, and this region coil-conductor uses wide line design, the ohmic loss caused with deperm material and shell conductor layer eddy current.The wide lines of second area coil-conductor are wider than the narrow linewidth width of first area coil-conductor, and narrow linewidth width such as is at live width or the live width such as not.
Coil-conductor and contact outside electronics point are outwards drawn by its end self-assembling formation or wire jumper form and are formed.
Described shell conductor layer surface can arrange hole, and this hole is in the region covering coil-conductor, and its edge is complete is not interrupted out gap.
The paralleling two beds conductive region of described first area also comprises the transitional region of wide line portion and narrow line portion, and this transitional region can cross over two parts region.
Described antenna assembly is in conductor layer determination situation, and antenna assembly resonance frequency is higher than the centre frequency using frequency range.
Because the coil-conductor in first area uses less live width, make antenna can realize multiturn coiling in comparatively zonule, realize the effect strengthening magnetic field, promote the communication effect of antenna.
Central idea of the present invention is: the coil-conductor of second area 1, covered at shell conductor layer is because adopting wide line design, considerably reduce the ohmic loss of spiral conductor itself, and the magnetic density reduced in shell conductor layer overlay area, reduces magnetic loss because magnetic material causes and shell conductor layer covers the ohmic loss produced simultaneously; 2, the coil-conductor of first area have employed narrow line design, can realize 5 to 7 circle designs, and adopt two-conductor layer Parallel Design in the confined space, effectively utilizes area and improves electromagnetic field intensity simultaneously, reduce the ohmic loss in this coil sections conductor.
In sum, the present invention has following technique effect: 1. do not destroy mobile device housing metallic portion structural intergrity, like this can the design space of significantly lift structure engineer, facilitates the appearance design of mobile device; 2. take less space, because the coil-conductor covered at shell conductor layer outside radiated electromagnetic wave, so do not need very large space, the antenna structure compared with small size can be designed; 3. achieve metal shell equipment near-field communication distance with non-metal shell equipment near-field communication apart from comparable effect; 4. the antenna structure of novelty, makes full use of the spatial character of antenna structure, forms high performance near field communication antenna.
Accompanying drawing explanation
Fig. 1 is the electronic equipment rearview in execution mode 1.
Fig. 2 is antenna assembly plan structure schematic diagram in execution mode 1, and its housing conductor layer 6 and coil-conductor 1 and magnetic material 2 carry out perspective process, namely can see coil-conductor 1 and magnetic material 2 by shell conductor layer 6.
Fig. 3 is the X-X ' generalized section of Fig. 2 antenna assembly, identical with execution mode 2 and execution mode 3 of its interlayer structure.
Fig. 4 is the antenna assembly plan structure schematic diagram in execution mode 2, and its housing conductor layer 6 and coil-conductor 1 and magnetic material 2 carry out perspective process, namely can see coil-conductor 1 and magnetic material 2 by shell conductor layer 6.
Fig. 5 is the electronic equipment rear structure figure in execution mode 3, and its housing conductor layer 6 and coil-conductor 1 and magnetic material 2 carry out perspective process, namely can see coil-conductor 1 and magnetic material 2 by shell conductor layer 6.
Reference numeral:
L3 ... the shell conductor layer of electronic equipment and the spacing in intermediate layer, SA ... electronic equipment interlayer structure top edge, 1 ... coil-conductor, 2 ... magnetic material, 3 ... the non-shell conductor layer overlying portions of coil-conductor, 4 ... coil-conductor by shell conductor layer overlying portions, 5 ... intermediate layer, the interlayer structure of electronic equipment, be mainly conductor module composition, 6 ... shell conductor layer, i.e. conductor part in electronic equipment casing, 7 ... camera of electronic equipment part.
Accompanying drawing illustrates existing description.Fig. 3 is integrally-built profile, and Fig. 3 and Fig. 2 combines.Fig. 3 coil conductor 1 due to the existence of shell conductor layer 6, by its point in order to two parts.Wherein region 4 is shell conductor layer 6 overlay area and second area, and region 3 is non-shell conductor layer 6 overlay area and first area.Due to region 4 cover by shell conductor layer 6, this region cannot externally send or receive electromagnetic wave, the electromagnetic wave of inside, region 4 is strapped in the middle of the metal environment of shell conductor layer 6 and inside, intermediate layer 5 completely, so the coil-conductor live width of the antenna assembly in this region needs by wide line design, to reduce ohmic loss.The coil-conductor live width of the antenna assembly in region 4 should between 0.8mm-1.5mm.Antenna assembly coil-conductor in region 3 is that reality outwards sends or receives electromagnetic part, this part will use hachure thin space to design, at utmost can increase electromagnetic field transmitting-receiving ability like this, and this part uses two-layer conductor Parallel Design, while increase electromagnetic wave transmitting-receiving ability, reduce the ohmic loss of this part.The coil-conductor live width 0.2mm-0.4mm of region 3 part, distance between centers of tracks 0.1mm-0.3mm, even if ensure that the width of antenna assembly in 3 regions also can be controlled between 2.1mm-4.9mm after coil-conductor is around 7 circles like this.
In figure 3, magnetic material 2 is magnetic flakes, and this magnetic flakes is that ferrite ceramics thin slice or resin type alloy powder fill thin slice.Magnetic material thin slice 2 covers its magnetic permeability real part >=130 of coil-conductor 1 completely, magnetic permeability imaginary part≤5.
Aerial coil conductor loops is looked by actual concrete condition around the number of turn, antenna assembly around 5 circles, region 3 width 3mm-4mm, length 30mm-40mm, in shell conductor layer 6 and intermediate layer 5 inner conductor layer and magnetic flakes determination situation, the inductance value of 800 ~ 1200nH can be realized.
According to foregoing description, the good communication antenna device of effect can be produced.
Embodiment
With reference to Fig. 1 ~ Fig. 5, the antenna assembly involved by specific embodiment is described.
Fig. 1 is the rearview of the mobile electronic device of the antenna assembly comprised involved by execution mode 1, such as mobile phone.The back side of electronic equipment is the one side towards communication counterpart side and read write line side antenna.As shown in Figure 1, in Fig. 1, the conductor part of mobile electronic device back cover forms shell conductor layer 6, and configuration example such as aluminium machine-shaping or the such as metal plating of shell conductor layer 6 are formed, to protect electronic equipment.Shell conductor layer 6 occupies most of scope of whole electronic equipment casing.And because supporting construction or the reason such as attractive in appearance, not easily carry out perforate design wherein.
Fig. 3 presses the profile that in Fig. 2, X-X ' is cut-off rule for this structure.Its interlayer structure is followed successively by shell conductor layer 6, coil-conductor 1, magnetic material 2, intermediate layer 5.
As shown in Figure 1, the intermediate layer 5 of electronic equipment, includes the midfoot support structure of electronic equipment in this layer, and the load module in structure, wherein load module comprises the modules such as electronic circuit board, battery, each communication and signal processing module, and this part is no lack of each metallic conductor class component.Intermediate layer 5 is spliced by large-area conductor layer, and is formed by connecting by various supporting construction.In top SA position, intermediate layer 5, often be equipped with the main communication antenna of electronic equipment, because main communication antenna need be assembled to SA position, so shell conductor layer 6 can not cover intermediate layer 5 completely, its spacing is represented by L3 in FIG, and L3 length is not more than 20mm.
As shown in Figure 1, at the top corner edge of middle 5, be the position being mounted with camera, as Fig. 1 mesopore 7.Due to such architectural characteristic, result also in shell conductor layer 6 without the need to perforate wherein to place camera lens.
Execution mode 1
Make 40mm × 40mm area, the live width single-conductor antenna 4 circle designs such as common 0.8mm, bottom assembling magnetic material, and coil-conductor surface covers without conductor layer, is denoted as ordinary antennas device; Making antenna assembly area is 40mm × 40mm, region 4 coil sections conductor live width 1.2mm, region 3 part helix is around conductor live width 0.3mm, overall 5 circle designs, bottom assembling magnetic material, antenna assembly coil-conductor surface coverage conductor layer, makes region 3 partial width 4mm, is denoted as antenna arrangement of the present invention; Making antenna assembly area is the live width individual layer antenna 4 circle designs such as the common 0.8mm of 40mm × 40mm, bottom assembling magnetic material, and covers conductor layer equally at antenna assembly, spills width 4mm equally, is denoted as conductor layer and covers ordinary antennas device.Contrast the communication effect of each mode.
From test comparison result, antenna assembly of the present invention can reach and cover 80% of ordinary antennas literacy without conductor layer, realizes good effect.If but adopted ordinary antennas design, be also assemblied in the antenna assembly in the equipment of large area conductor layer shell, its reading/writing distance will decline to a great extent, and the antenna assembly of visible invention can play stronger lifting effect.
Execution mode 2
Electronic equipment casing is still as the structure at the electronic equipment rear portion in Fig. 1.In Fig. 1, L3 is longer, reserve wider space can to 3 parts in the antenna assembly of invention, carry out the live width design such as not, can realize better communication effect for the coil-conductor 1 in region 3.
If L3 length is longer, the antenna assembly interlayer structure realized is as in Fig. 3 as described in antenna assembly, antenna assembly detail is as shown in antenna assembly in Fig. 4, region 3 part in Fig. 4, this partial width 6mm, its coil-conductor carries out not waiting width step-like design, and the live width ecto-entad of region 3 coil conductor 1 carries out equal difference design successively.Final realization is as the structure of antenna assembly in Fig. 4.
As the structure in Fig. 4, the design reduces the resistance of region 3 coil conductor 1 in antenna assembly, decrease ohmic loss, improve communication distance.
Execution mode 3
Electronic equipment casing rear structure as shown in Figure 5, the rear structure of the electronic equipment in comparison diagram 2, its difference is, perforate design has been carried out in shell conductor layer 6, its perforate 7 position is selected at the centering ring of antenna assembly coil conductor 1 around vacant part, but its verge of opening is not formed and interrupts gap.
Shell conductor layer 6 part, the centering ring of the coil-conductor in antenna assembly carries out perforate around vacant part, enters window, can further improve the communication distance of antenna assembly after perforate for antenna assembly provides larger electromagnetic wave.
The interlayer structure of antenna assembly is as described in the antenna assembly in Fig. 3.
Claims (6)
1. a near field communication antenna device, this antenna assembly is the antenna assembly formed in mobile electronic device, comprising: coil-conductor, flexible base, board, magnetic material and shell conductor layer, is characterized in that:
Described coil-conductor, using winding center portion as the ring-type in coil aperture portion or spiral coil, the flexible base, board depended on it is assemblied in magnetic flakes material surface;
Described flexible base, board, the baseplate material of support coils conductor, coil-conductor is formed on flexible base, board;
Described magnetic material, is assemblied in the side of coil-conductor away from shell conductor layer;
Described shell conductor layer, for forming the metallic member of mobile electronic device casing and part structural support, this conductor layer is formed at shell inner surface or the outer surface of the electronic equipment of assembly object, is configured at than the side of described coil-conductor near the antenna of communication the other side side;
When overlooking described antenna assembly, shell conductor layer partly need cover coil-conductor, namely coil-conductor blocks and is divided into two regions by shell conductor layer: first area is non-shell conductor layer shield portions, i.e. antenna actual magnetic link couples part, this part is actual aerial radiation part, this coil sections conductor adopts narrow linewidth design or major part to adopt narrow linewidth design, and this coil sections conductor uses two-conductor layer Parallel Design, realizes less ohmic loss; Second area is shell conductor layer shield portions, and this region coil-conductor uses wide line design, the ohmic loss caused with deperm material and shell conductor layer eddy current; The wide lines of second area coil-conductor are wider than the narrow linewidth width of first area coil-conductor;
Coil-conductor and contact outside electronics point are outwards drawn by its end self-assembling formation or wire jumper form and are formed.
2. near field communication antenna device as claimed in claim 1, is characterized in that: described shell conductor layer surface can arrange hole, and this hole is in the second area covering coil-conductor, and its edge is complete is not interrupted out gap.
3. near field communication antenna device as claimed in claim 1, it is characterized in that: the paralleling two beds conductive region of described first area also comprises the transitional region of wide line portion and narrow line portion, this transitional region can cross over two parts region.
4. near field communication antenna device as claimed in claim 1, is characterized in that: the narrow linewidth width of described first area coil-conductor such as is at live width or the live width such as not.
5. near field communication antenna device as claimed in claim 1, is characterized in that: in shell conductor layer determination situation, and antenna assembly resonance frequency is higher than the centre frequency using frequency range.
6. a mobile electronic device, is characterized in that: be equipped with the near field communication antenna device described in the arbitrary claim of claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510442911.4A CN105048061B (en) | 2015-07-27 | 2015-07-27 | A kind of near field communication antenna device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510442911.4A CN105048061B (en) | 2015-07-27 | 2015-07-27 | A kind of near field communication antenna device |
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| CN105048061A true CN105048061A (en) | 2015-11-11 |
| CN105048061B CN105048061B (en) | 2018-01-12 |
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| CN201510442911.4A Active CN105048061B (en) | 2015-07-27 | 2015-07-27 | A kind of near field communication antenna device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576343A (en) * | 2016-01-25 | 2016-05-11 | 电子科技大学 | Near-field communication antenna device |
| CN110165392A (en) * | 2018-02-14 | 2019-08-23 | 三星电机株式会社 | Anneta module and electronic equipment equipped with the Anneta module |
| CN110212285A (en) * | 2019-06-28 | 2019-09-06 | 上海天马微电子有限公司 | A kind of near field communication antenna and preparation method thereof, display module and display system |
| CN110416731A (en) * | 2019-07-12 | 2019-11-05 | 禾邦电子(苏州)有限公司 | A kind of electronic equipment with miniaturization near-field communication aerial |
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| WO2011036962A1 (en) * | 2009-09-25 | 2011-03-31 | 株式会社村田製作所 | Antenna device and handheld terminal |
| CN102405556A (en) * | 2009-04-21 | 2012-04-04 | 株式会社村田制作所 | Antenna apparatus and resonant frequency setting method of same |
| CN103797642A (en) * | 2011-10-07 | 2014-05-14 | 株式会社村田制作所 | Antenna device and electronic device |
| CN103825099A (en) * | 2014-02-28 | 2014-05-28 | 电子科技大学 | Short distance wireless communication tag antenna |
| CN103843197A (en) * | 2011-11-09 | 2014-06-04 | 株式会社村田制作所 | Antenna device and electronic device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102405556A (en) * | 2009-04-21 | 2012-04-04 | 株式会社村田制作所 | Antenna apparatus and resonant frequency setting method of same |
| WO2011036962A1 (en) * | 2009-09-25 | 2011-03-31 | 株式会社村田製作所 | Antenna device and handheld terminal |
| CN103797642A (en) * | 2011-10-07 | 2014-05-14 | 株式会社村田制作所 | Antenna device and electronic device |
| CN103843197A (en) * | 2011-11-09 | 2014-06-04 | 株式会社村田制作所 | Antenna device and electronic device |
| CN103825099A (en) * | 2014-02-28 | 2014-05-28 | 电子科技大学 | Short distance wireless communication tag antenna |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576343A (en) * | 2016-01-25 | 2016-05-11 | 电子科技大学 | Near-field communication antenna device |
| CN105576343B (en) * | 2016-01-25 | 2018-04-06 | 电子科技大学 | A kind of near field communication antenna device |
| CN110165392A (en) * | 2018-02-14 | 2019-08-23 | 三星电机株式会社 | Anneta module and electronic equipment equipped with the Anneta module |
| CN110212285A (en) * | 2019-06-28 | 2019-09-06 | 上海天马微电子有限公司 | A kind of near field communication antenna and preparation method thereof, display module and display system |
| CN110212285B (en) * | 2019-06-28 | 2021-11-02 | 上海天马微电子有限公司 | Near field communication antenna, manufacturing method thereof, display module and display system |
| CN110416731A (en) * | 2019-07-12 | 2019-11-05 | 禾邦电子(苏州)有限公司 | A kind of electronic equipment with miniaturization near-field communication aerial |
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| CN105048061B (en) | 2018-01-12 |
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