CN104681988A - Near field communication antenna - Google Patents
Near field communication antenna Download PDFInfo
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- CN104681988A CN104681988A CN201310611044.3A CN201310611044A CN104681988A CN 104681988 A CN104681988 A CN 104681988A CN 201310611044 A CN201310611044 A CN 201310611044A CN 104681988 A CN104681988 A CN 104681988A
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- field communication
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- coupling branch
- communication aerial
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Abstract
A near field communication antenna comprises a dielectric substrate, a coil and a coupling structure, wherein the coil is arranged on the dielectric substrate; the coupling structure comprises at least one coupling branch; and two tail ends of the coupling branch are respectively connected with two different connection points on the coil. The coupling structure of the invention can average coupling current of the near field communication antenna, and omnidirectional performance of the near field communication antenna is further improved.
Description
Technical field
The present invention relates to a kind of near-field communication (Near Field Communication, NFC) antenna, particularly a kind of omni-directional (Isotropic) and high efficiency near-field communication aerial.
Background technology
Along with the prosperity of mobile communication technology, mobile device is more prevalent in recent years, such as common: the portable electronic apparatus of hand-held computer, mobile phone, multimedia player and other mixed functions.In order to meet the demand of people, mobile device has the function of radio communication usually.Some contains the range for wireless communication of long distance, such as: mobile phone uses 2G, 3G, LTE(Long Term Evolution, Long Term Evolution) system and use 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, the frequency bands for communication of 2300MHz and 2500MHz, some then contains short-range range for wireless communication, such as: Wi-Fi, Bluetooth(bluetooth) and WiMAX(Worldwide Interoperability for Microwave Access, micro-wave access global inter communication) system use 2.4GHz, 3.5GHz, the frequency bands for communication of 5.2GHz and 5.8GHz.
To have the mobile device of near field communication (NFC) function, because its near-field communication aerial must be arranged in a rectangular card usually, also shape is consistent with it, and the reader causing being correlated with all cannot can be obtained good reception in various angle by this design.For example, the angle between reader and the long limit of near-field communication aerial be 90 degree or 270 degree time, the electric field strength received by this reader will be relatively faint, thus reduces the communication quality of near-field communication aerial.
Thus, need to provide a kind of near-field communication aerial to solve the problems referred to above.
Summary of the invention
In order to solve the problem of prior art, the invention provides a kind of near-field communication aerial, this near-field communication aerial comprises: a medium substrate; One coil, this coil is arranged on this medium substrate; And a coupled structure, this coupled structure comprises at least one coupling branch road, and wherein two ends of this coupling branch road are connected to the two different tie points on this coil respectively.This coupled structure is for improving the omni-directional of this near-field communication aerial.
Coupled structure of the present invention can the couple current of average near field communication antenna, and then effectively promotes the overall omni-directional of near-field communication aerial.
Accompanying drawing explanation
Fig. 1 is the vertical view of the near-field communication aerial of display according to one embodiment of the invention;
Fig. 2 A is the stereogram of the near-field communication aerial described in display according to another embodiment of the present invention;
Fig. 2 B is the stereogram of the near-field communication aerial of display according to one more embodiment of the present invention;
Fig. 3 is the stereogram of the near-field communication aerial of display according to preferred embodiment of the present invention;
Fig. 4 A is the stereogram of the coupled structure of display according to one embodiment of the invention;
Fig. 4 B is the stereogram of the coupled structure of display according to one embodiment of the invention;
Fig. 4 C is the stereogram of the coupled structure of display according to one embodiment of the invention;
Fig. 5 A is the stereogram of the coupled structure of display according to one embodiment of the invention;
Fig. 5 B is the stereogram of the coupled structure of display according to one embodiment of the invention;
Fig. 5 C is the stereogram of the coupled structure of display according to one embodiment of the invention;
Fig. 5 D is the stereogram of the coupled structure of display according to one embodiment of the invention;
Fig. 6 A is the near-field communication aerial of display according to one embodiment of the invention and the relative bearing figure of measuring equipment;
Fig. 6 B shows near-field communication aerial described according to another embodiment of the present invention and the relative bearing figure of measuring equipment; And
Fig. 7 is the electric field strength of near-field communication aerial of display according to one embodiment of the invention and the graph of a relation of test angle.
Primary clustering symbol description:
100,200,250,300 near-field communication aerials
110 medium substrates
111 region, lefts
112 middle sections
113 region, rights
120,320 coils
121, the end of 122,321,322 coils
130,230,235,330,410,420,430,510, coupled structure
520、530、540
131,231,232,331,531,532,533,534 coupling branch roads
241,242,243,244,340 conductive through holes
The center empty regions of 325 coils
610 measuring equipments
CC0, CC1, CC2, CC3, CC4 curve
The spacing of the adjacent two coupling branch roads of D1
The surface of E1, E2 medium substrate
The thickness of H1 medium substrate
L1, L2 length
P1, P2, P3, P4 tie point
Embodiment
For object of the present invention, feature and advantage can be become apparent, cited below particularly go out specific embodiments of the invention, and coordinate appended accompanying drawing, be described in detail below.
Fig. 1 is the vertical view of the near-field communication aerial 100 of display according to one embodiment of the invention.Near-field communication aerial 100 can be arranged in a mobile device, such as: an intelligent mobile phone (Smart Phone), a flat computer (Tablet Computer), or a notebook computer (Notebook Computer).As shown in Figure 1, near-field communication aerial 100 comprises: medium substrate 110, coil 120 and a coupled structure 130.Medium substrate 110 can be a FR4(Flame Retard4) substrate.Coil 120 and coupled structure 130 can be made with conductor, such as: copper, silver, aluminium, iron or its alloy.Coil 120 is arranged on medium substrate 110.In certain embodiments, coil 120 is as a main radiation portion of near-field communication aerial 100, and two ends 121,122 of coil 120 are connected to a positive pole and a negative pole of a signal source (not shown) respectively.This signal source can be a radio frequency (Radio Frequency, RF) module, and for exciting near-field communication aerial 100.The total number of turns of coil 120 can be 1,2,3,4 or more.In certain embodiments, arbitrary end of coil 120 also can be connected to a match circuit (not shown), to adjust its resonant length.Under this design, coil 120 can work in the near-field communication Frequency point of 13.56MHz.Coupled structure 130 comprises at least one coupling branch road 131, and two ends of the branch road 131 that is wherein coupled are connected to difference two tie point P1, P2 on coil 120 respectively.In certain embodiments, coil 120 is roughly a rectangle, and this rectangle has two long limits and two minor faces, and these tie points P1, P2 are roughly positioned on this isometric limit of this rectangle respectively.In further embodiments, on these tie points P1, P2 one long limit that also roughly can be positioned at this rectangle respectively and a minor face.The coupling branch road 131 of coupled structure 130 can be considered a resistor and a capacitor of series connection.When the branch road 131 that is coupled is connected to coil 120, its impedance operator can strengthen the coupling energy of near-field communication aerial 100, and then improves the omni-directional of near-field communication aerial 100.
In the embodiment in figure 1, coil 120 and coupled structure 130 can all be arranged on the same surperficial E1 of medium substrate 110.But the present invention is not limited to this.Fig. 2 A is the stereogram of the near-field communication aerial 200 of display according to another embodiment of the present invention.In the embodiment of Fig. 2 A, coil 120 and a coupled structure 230 of near-field communication aerial 200 are arranged on relative two surperficial E1, E2 of medium substrate 110 respectively.Near-field communication aerial 200 also comprises two conductive through holes 241,242 be formed in medium substrate 110, and wherein two ends of at least one coupling branch road 231 of coupled structure 230 are connected to two tie point P1, P2 on coil 120 respectively via these conductive through holes 241,242.
Fig. 2 B is the stereogram of the near-field communication aerial 250 of display according to one more embodiment of the present invention.Fig. 2 B is similar to Fig. 2 A.In the embodiment of Fig. 2 B, coil 120 and a coupled structure 235 of near-field communication aerial 250 are also arranged on relative two surperficial E1, E2 of medium substrate 110 respectively.Near-field communication aerial 250 also comprises four conductive through holes 241,242,243,244 be formed in medium substrate 110.Two ends of one coupling branch road 231 of coupled structure 235 are connected to two tie point P1, P2 on coil 120 respectively via these conductive through holes 241,242, and two ends of another coupling branch road 232 of coupled structure 235 are connected to other two tie point P3, the P4 on coil 120 respectively via these conductive through holes 243,244.Compared with Fig. 2 A, the near-field communication aerial 250 shown in Fig. 2 B presents preferably symmetry, and therefore it can provide higher omni-directional.Must be noted that the shape of aforesaid coupling branch road is not restricted in the present invention especially.For example, each coupling branch road aforesaid can be roughly a vertical bar shaped, a bracket shape, a fold-line-shaped, a semicircular arc or a smooth curves.
Fig. 3 is the stereogram of the near-field communication aerial 300 of display according to preferred embodiment of the present invention.As shown in Figure 3, near-field communication aerial 300 comprises: medium substrate 110, coil 320 and a coupled structure 330.Coil 320 and coupled structure 330 are arranged on relative two surperficial E1, E2 of medium substrate 110 respectively.Compared with aforesaid embodiment, the coupled structure 330 of near-field communication aerial 300 comprises more multiple coupled branch road 331, and the total number of turns of the coil 320 of near-field communication aerial 300 is also more.In certain embodiments, the total quantity of these coupling branch roads 331 can be just the twice of the total number of turns of coil 320, is beneficial to it and connects symmetrically mutually.For example, the total quantity of these coupling branch roads 331 can be 8, and the total number of turns of coil 320 can be 4, but is not limited only to this.Near-field communication aerial 300 also can comprise and is formed at multiple conductive through hole 340(in medium substrate 110 such as: 16 conductive through holes 340 separated from one another), wherein two ends of each coupling branch road 331 can be connected to two tie points respective on coil 320 via two respective conductive through holes 340 respectively.In more detail, coil 320 can comprise multiple loops of different size, and coupled structure 330 can comprise multiple coupling branch roads 331 of different length, and wherein longer coupling branch road 331 is connected to larger loop, and shorter coupling branch road 331 is connected to less loop, the rest may be inferred.Under this design, every primary Ioops of coil 320 just can be connected to the equal two respective coupling branch roads 331 of length.
The surperficial E2 of medium substrate 110 can be further subdivided into region, left 111, middle section 112 and a region, right 113, and wherein region, left 111 can fully be separated with region, right 113 by middle section 112.In certain embodiments, these coupling branch roads 331 of coupled structure 330 are arranged in region, left 111 and region, right 113 symmetrically.For example, if there are four coupling branch roads 331 to be arranged in region, left 111, be then arranged in region, right 113 with having other four coupling branch road 331 mirror images.Coil 320 can have a center empty regions 325.In certain embodiments, the upright projection of these coupling branch roads 331 on coil 320 all can roughly be positioned at center empty regions 325, but these upright projections can not be overlapping with the centre point of coil 320.In certain embodiments, these coupling branch roads 331 arrange roughly parallel to each other.For example, coil 320 can be roughly a rectangle, and this rectangle has two long limits and two minor faces, and these coupling branch roads 331 roughly all can be parallel to these minor faces of this rectangle and arrange.In order to increase coupling energy, the total length L 2 of coupled structure 330 is less than the length L1 on the long limit of square coil 320 usually.For example, the total length L 2 of coupled structure 330 can be roughly 50% to 80% of the length L1 on the long limit of this square coil 320.
In the embodiments of figure 3, the total quantity of these coupling branch roads 331 of coupled structure 330 is 8, and each coupling branch road 331 is roughly a bracket shape.But the present invention is not limited to this.In further embodiments, coupled structure 330 can comprise more or less coupling branch road 331, and each coupling branch road 331 also can have difformity.In other embodiments, these coupling branch roads 331 also can be arranged on the surperficial E2 of medium substrate 110 asymmetrically.For example, a coupling branch road 331 can be had to be arranged in the region, left 111 of medium substrate 110, but have three coupling branch roads 331 to be arranged in the region, right 113 of medium substrate 110.Some change configurations of near-field communication aerial of the present invention can as described in the following example.
Fig. 4 A is the stereogram of the coupled structure 410 of display according to one embodiment of the invention.In the embodiment of Fig. 4 A, coupled structure 410 comprises two coupling branch roads 331, and it is arranged on the surperficial E2 of medium substrate 110 symmetrically.Fig. 4 B is the stereogram of the coupled structure 420 of display according to one embodiment of the invention.In the embodiment of Fig. 4 B, coupled structure 420 comprises four coupling branch roads 331, and it is arranged on the surperficial E2 of medium substrate 110 symmetrically.Fig. 4 C is the stereogram of the coupled structure 430 of display according to one embodiment of the invention.In the embodiment of Fig. 4 C, coupled structure 430 comprises six coupling branch roads 331, and it is arranged on the surperficial E2 of medium substrate 110 symmetrically.It is to be understood that two ends of each coupling branch road aforesaid all can be connected on the respective primary Ioops of a coil separately.For example, longer coupling branch road is connected to larger loop, and shorter coupling branch road is connected to less loop, and the rest may be inferred.Fig. 4 A, Fig. 4 B, the coupled structure 410,420,430 shown in Fig. 4 C all can be used for replacing the coupled structure 330 in Fig. 3.
Fig. 5 A is the stereogram of the coupled structure 510 of display according to one embodiment of the invention.In the embodiment of Fig. 5 A, coupled structure 510 comprises two coupling branch roads 531, and each coupling branch road 531 is roughly a vertical bar shaped.Fig. 5 B is the stereogram of the coupled structure 520 of display according to one embodiment of the invention.In the embodiment of Fig. 5 B, coupled structure 520 comprises two coupling branch roads 532, and each coupling branch road 532 is roughly a fold-line-shaped.Fig. 5 C is the stereogram of the coupled structure 530 of display according to one embodiment of the invention.In the embodiment of Fig. 5 C, coupled structure 530 comprises two coupling branch roads 533, and each coupling branch road 533 is roughly a semicircular arc.Fig. 5 D is the stereogram of the coupled structure 540 of display according to one embodiment of the invention.In the embodiment of Fig. 5 D, coupled structure 540 comprises two coupling branch roads 534, and each coupling branch road 534 is roughly a smooth curves.It is to be understood that each coupled structure aforesaid can comprise more multiple coupled branch road, and two ends of each coupling branch road all can be connected on the respective primary Ioops of a coil separately.For example, longer coupling branch road is connected to larger loop, and shorter coupling branch road is connected to less loop, and the rest may be inferred.Coupled structure 510,520,530,540 shown in Fig. 5 A, Fig. 5 B, Fig. 5 C, Fig. 5 D all can be used for replacing the coupled structure 330 in Fig. 3.
Fig. 6 A is the near-field communication aerial 300 of display according to one embodiment of the invention and the relative bearing figure of measuring equipment 610.Fig. 6 B shows near-field communication aerial 300 described according to another embodiment of the present invention and the relative bearing figure of measuring equipment 610.Measuring equipment 610 can be used for the electromagnetic wave that detection near-field communication aerial 300 transmits, and can analyze this electromagnetic electric field strength.Measuring equipment 610 can be roughly a rectangle.When the long limit of measuring equipment 610 and the long limit of near-field communication aerial 300 parallel time, the test angle that can be considered between measuring equipment 610 and near-field communication aerial 300 is 0 degree or 180 degree (as shown in Figure 6A); And when the long limit of measuring equipment 610 and the long limit of near-field communication aerial 300 vertical time, the test angle that can be considered between measuring equipment 610 and near-field communication aerial 300 is 90 degree or 270 degree (as shown in Figure 6B).
Fig. 7 is the electric field strength of near-field communication aerial 300 of display according to one embodiment of the invention and the graph of a relation of test angle.As previously mentioned, measuring equipment 610 can detect the electric field strength of near-field communication aerial 300 in different test angle, and its measurement is shown in Fig. 7.The electric field strength that curve C C0 representative is detected when coupled structure 330 is removed; The electric field strength of curve C C1 representative when coupled structure 330 comprises two coupling branch roads 331 detected by (as shown in Figure 4 A); The electric field strength of curve C C2 representative when coupled structure 330 comprises four coupling branch roads 331 detected by (as shown in Figure 4 B); The electric field strength of curve C C3 representative when coupled structure 330 comprises six coupling branch roads 331 detected by (as shown in Figure 4 C); And the electric field strength of curve C C4 representative when coupled structure 330 comprises eight coupling branch roads 331 detected by (as shown in Figure 3).According to the measurement of Fig. 7, if coupled structure 330 comprises the more multi-link coupling branch road 331 to coil 320, then near-field communication aerial 300 electric field that intensity can be provided average in each test angle.Coupled structure of the present invention can the couple current of average near field communication antenna more, and then effectively promotes the overall omni-directional of near-field communication aerial.
Fig. 3 please be refer again to.In certain embodiments, size of components of the present invention and component parameter can as what follows.The thickness H1 of medium substrate 110 is less than 2mm.Coil 320 works in 13.56MHz Frequency point.The gross area of coil 320 is about 60x40mm
2.The space D 1 of the adjacent pairs of these coupling branch roads 331 is less than 1mm.The upright projection of these coupling branch roads 331 on coil 320 is roughly positioned at center empty regions 325, and the area of middle body not overlapping with these upright projections in center empty regions 325 is about 20x20mm
2.
It should be noted that above-described component parameter, element shapes and frequency range are all non-for restrictive condition of the present invention.Antenna designers can need to adjust these set points according to difference.Near-field communication aerial of the present invention is not limited in the state illustrated in Fig. 1-Fig. 7.The present invention only can comprise any one or more of feature of one or more embodiment any of Fig. 1-Fig. 7.In other words, and the feature of not all icon must be implemented in the middle of near-field communication aerial of the present invention simultaneously.
Ordinal number in the scope of this specification and claims, such as " first ", " second ", " the 3rd " etc., the precedence relationship each other not in order, it only has the different assemblies of same name for indicating differentiation two.
Though the present invention with preferred embodiment openly as above; but itself and be not used to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; should do a little change and retouching, therefore protection scope of the present invention should be as the criterion depending on the scope person of defining of appending claims.
Claims (17)
1. a near-field communication aerial, this near-field communication aerial comprises:
One medium substrate;
One coil, this coil is arranged on this medium substrate; And
One coupled structure, this coupled structure comprises at least one coupling branch road, and wherein two ends of this coupling branch road are connected to the two different tie points on this coil respectively.
2. near-field communication aerial as claimed in claim 1, wherein this coil is as a main radiation portion of this near-field communication aerial, and two ends of this coil are connected to a positive pole and a negative pole of a signal source respectively.
3. near-field communication aerial as claimed in claim 1, wherein this coil is roughly a rectangle, and this rectangle has two long limits and two minor faces, and these tie points are roughly positioned on this isometric limit respectively.
4. near-field communication aerial as claimed in claim 1, wherein this coil and this coupled structure are all arranged on the same surface of this medium substrate.
5. near-field communication aerial as claimed in claim 1, wherein this coil and this coupled structure are arranged at relative two of this medium substrate on the surface respectively.
6. near-field communication aerial as claimed in claim 5, wherein at least two conductive through holes are formed in this medium substrate, and these ends of this coupling branch road are connected to these tie points on this coil respectively via these conductive through holes.
7. near-field communication aerial as claimed in claim 5, wherein this coupled structure comprises multiple coupling branch road, this medium substrate comprises a region, left, a middle section and a region, right, these coupling branch roads are arranged in this region, left and this region, right symmetrically, and this region, left is fully separated with this region, right by this middle section.
8. near-field communication aerial as claimed in claim 7, wherein this coil has a center empty regions, and these coupling branch roads upright projection on the coil is all roughly positioned at this center empty regions.
9. near-field communication aerial as claimed in claim 7, wherein the total quantity of these coupling branch roads is the twice of the total number of turns of this coil.
10. near-field communication aerial as claimed in claim 7, wherein the total quantity of these coupling branch roads is 2,4,6 or 8.
11. near-field communication aerials as claimed in claim 7, wherein each these coupling branch road is roughly a vertical bar shaped, a bracket shape, a fold-line-shaped, a semicircular arc or a smooth curves respectively.
12. near-field communication aerials as claimed in claim 7, wherein these coupling branch roads arrange roughly parallel to each other.
13. near-field communication aerials as claimed in claim 12, wherein this coil is roughly a rectangle, and this rectangle has two long limits and two minor faces, and these coupling branch roads are all roughly parallel to these minor faces.
14. near-field communication aerials as claimed in claim 7, wherein the spacing of the adjacent pairs of these coupling branch roads is less than 1mm.
15. near-field communication aerials as claimed in claim 1, wherein this medium substrate is a FR4 substrate.
16. near-field communication aerials as claimed in claim 1, wherein the thickness of this medium substrate is less than 2mm.
17. near-field communication aerials as claimed in claim 1, wherein this coil working is in 13.56MHz Frequency point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310611044.3A CN104681988B (en) | 2013-11-26 | 2013-11-26 | Near-field communication aerial |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310611044.3A CN104681988B (en) | 2013-11-26 | 2013-11-26 | Near-field communication aerial |
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| CN104681988A true CN104681988A (en) | 2015-06-03 |
| CN104681988B CN104681988B (en) | 2017-11-21 |
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| CN201310611044.3A Active CN104681988B (en) | 2013-11-26 | 2013-11-26 | Near-field communication aerial |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635220A (en) * | 2018-06-22 | 2019-12-31 | 阿自倍尔株式会社 | Electronic equipment and NFC antenna |
| CN112673522A (en) * | 2018-08-02 | 2021-04-16 | 上海诺基亚贝尔股份有限公司 | Antenna and wireless communication device |
| CN114530694A (en) * | 2022-04-24 | 2022-05-24 | 云谷（固安）科技有限公司 | Wireless communication structure, display panel and wireless communication device |
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| US7511670B2 (en) * | 2007-04-16 | 2009-03-31 | Research In Motion Limited | Dual-polarized, multiple strip-loop antenna, and associated methodology, for radio device |
| CN102810736A (en) * | 2011-06-29 | 2012-12-05 | 深圳光启高等理工研究院 | Antenna and wireless communication device |
| WO2013073314A1 (en) * | 2011-11-14 | 2013-05-23 | 株式会社村田製作所 | Antenna device and wireless communication device |
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| US7511670B2 (en) * | 2007-04-16 | 2009-03-31 | Research In Motion Limited | Dual-polarized, multiple strip-loop antenna, and associated methodology, for radio device |
| CN102810736A (en) * | 2011-06-29 | 2012-12-05 | 深圳光启高等理工研究院 | Antenna and wireless communication device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635220A (en) * | 2018-06-22 | 2019-12-31 | 阿自倍尔株式会社 | Electronic equipment and NFC antenna |
| CN112673522A (en) * | 2018-08-02 | 2021-04-16 | 上海诺基亚贝尔股份有限公司 | Antenna and wireless communication device |
| CN114530694A (en) * | 2022-04-24 | 2022-05-24 | 云谷（固安）科技有限公司 | Wireless communication structure, display panel and wireless communication device |
| US11631930B2 (en) | 2022-04-24 | 2023-04-18 | Yungu (Gu'an) Technology Co., Ltd. | Wireless communication structure, display panel and wireless communication apparatus |
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| CN104681988B (en) | 2017-11-21 |
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