CN104466363A - NFC antenna structure applied to wearable device and intelligent watch - Google Patents
NFC antenna structure applied to wearable device and intelligent watch Download PDFInfo
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- CN104466363A CN104466363A CN201410763777.3A CN201410763777A CN104466363A CN 104466363 A CN104466363 A CN 104466363A CN 201410763777 A CN201410763777 A CN 201410763777A CN 104466363 A CN104466363 A CN 104466363A
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Abstract
The invention discloses an NFC antenna structure applied to a wearable device and an intelligent watch. The NFC antenna structure comprises an antenna radiation body, an adjustment circuit assembly, a first feed part and a second feed part, wherein the antenna radiation body is a single-turn metal coil with an opening, and the opening divides the metal coil into a non-closed annular structure; the adjustment circuit assembly comprises a first inductor, a second inductor and a capacitor, and the first inductor and the second inductor are connected in series and then overall connected with the capacitor in parallel. The first inductor and the second inductor connected in series increase the inductance value of the radiation body which is the single-turn non-closed metal coil or metal ring, the capacitor increases the capacitance of the radiation body, the turn number of the metal coil is reduced to one, the occupied space and size of the antenna are small, and communication quality is reliable.
Description
Technical field
The present invention relates to antenna technical field, particularly relate to a kind of NFC antenna structure for wearable device and intelligent watch.
Background technology
In the last few years, wearable device more and more received the concern of people.Development as the intelligent watch of the important a member of wearable device is rapid.Up to the present, many mobile-phone manufacturers (as apple, Motorola and three magnitudes) have started manufacturing intelligence wrist-watch.Certainly, in order to set up wireless connections and communication with ancillary equipment (as mobile phone etc.), intelligent watch must support certain wireless communication protocol (as bluetooth etc.).On the other hand, the NFC communication become more and more popular has become a standard feature of smart mobile phone.NFC is a contactless identification and interconnection technique, and its operating frequency is 13.56MHz, is applicable to the short haul connection in mobile phone, civil electronic, computer and intelligent controlling device etc.Therefore, NFC can allow consumer like a cork exchange message, access content and serve.Certainly, intelligent watch should support NFC communication.
Although there is many NFC antenna designs in prior art, wherein most scheme has been only suitable for being applied to mobile phone.NFC antenna structure conventional in mobile phone generally includes two parts: 1, aerial radiation main body, is specially the FPC copper coil of 3-5 circle; 2, ferrite, isolation copper coil and metal object (as other metal objects such as batteries).Generally speaking, NFC antenna is a kind of loop aerial, is generally and is horizontally disposed with and is fixed on the mobile phone back side.Above-mentioned NFC antenna structure significant discomfort closes Wearable as wrist-watch scheme, this is because when people bring wrist-watch, if NFC antenna to be positioned at according to the scheme of Cell Phone Design the back side of wrist-watch, now NFC antenna communication is difficult to realize, and has had a strong impact on the communication efficiency of NFC antenna.In other words, the NFC antenna scheme being applicable to wrist-watch should be allow antenna from the right-side-out radiation of wrist-watch.Therefore, in order to meet the requirement that develops rapidly of the wearable devices such as intelligent watch, it is very urgent and necessary for designing a special NFC antenna.
Summary of the invention
Technical problem to be solved by this invention is: provide that a kind of structure is simple, the NFC antenna structure for wearable device of good communication quality and intelligent watch.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: provide a kind of NFC antenna structure for wearable device, comprises aerial radiation main body, the regulating circuit assembly be made up of SMD inductance and electric capacity, the first current feed department and the second current feed department;
Described aerial radiation main body is the wire coil of single turn; Described wire coil is provided with opening, and wire coil is divided into nonocclusive circulus by described opening;
Described regulating circuit assembly comprises the first inductance, the second inductance and electric capacity, and one end of described first inductance is connected with the first current feed department, and the other end of the first inductance is connected with one end of wire coil; One end of described second inductance is connected with the second current feed department, and the other end of the second inductance is connected with the other end of wire coil; One end of described electric capacity is connected on the contact that the first inductance is connected with the first current feed department, and the other end is connected on the contact that the second inductance is connected with the second current feed department.
In order to solve the problems of the technologies described above, another technical scheme that the present invention adopts is: provide a kind of intelligent watch, comprise table cover, framework, chip assembly, battery, bonnet, pcb board, antenna module and watchband, described table cover, framework and bonnet surround accommodation space, described chip assembly, pcb board, antenna module and battery are positioned at accommodation space, described watchband is arranged on framework, described antenna module is NFC antenna assembly, and described NFC antenna assembly comprises aerial radiation main body, regulating circuit assembly, the first current feed department and the second current feed department;
Described aerial radiation main body is around pcb board and is positioned at the single turn wire coil of frame inner surface, and described wire coil is provided with opening, and wire coil is divided into nonocclusive circulus by described opening;
Described regulating circuit assembly comprises the first inductance, the second inductance and electric capacity, and one end of described first inductance is connected with the first current feed department, and the other end of the first inductance is connected with one end of wire coil; One end of described second inductance is connected with the second current feed department, and the other end of the second inductance is connected with the other end of wire coil; One end of described electric capacity is connected on the contact that the first inductance is connected with the first current feed department, and the other end is connected on the contact that the second inductance is connected with the second current feed department.
In order to solve the problems of the technologies described above, the another technical scheme that the present invention adopts is: provide a kind of intelligent watch, comprise table cover, framework, chip assembly, battery, bonnet, pcb board, antenna module and watchband, described table cover, framework and bonnet surround accommodation space, described chip assembly, pcb board and battery are positioned at accommodation space, described watchband is arranged on framework, also comprise one around and be close to the becket of frame outer surface, described antenna module is NFC antenna assembly, described NFC antenna assembly comprises aerial radiation main body, regulating circuit assembly, first current feed department and the second current feed department,
Described aerial radiation main body is becket, and described becket is provided with opening, and becket is divided into nonocclusive circulus by described opening;
Described regulating circuit assembly comprises the first inductance, the second inductance and electric capacity, and one end of described first inductance is connected with the first current feed department, and the other end of the first inductance is connected with one end of becket; One end of described second inductance is connected with the second current feed department, and the other end of the second inductance is connected with the other end of becket; One end of described electric capacity is connected on the contact that the first inductance is connected with the first current feed department, and the other end is connected on the contact that the second inductance is connected with the second current feed department.
Beneficial effect of the present invention is: the NFC antenna communication that the back side according to the scheme of Cell Phone Design, NFC antenna being positioned at wrist-watch in prior art if be different from causes is difficult to the problem realized, the invention provides a kind of NFC antenna structure for wearable device, do not need to add ferrite, can antenna structure be simplified; And aerial radiation main body adopts single non-close wire coil or becket design, and structure is simpler, area occupied and space little, be conducive to thinner and miniaturized design; Adopt the first inductance of serial connection and the second inductance can increase the inductance value that radiant body is single non-close wire coil or becket, the capacitance of radiant body can be increased by electric capacity, the number of turn of wire coil can be reduced to single turn, area shared by this antenna and small volume, structure is simpler, and communication quality is reliable.
Accompanying drawing explanation
Fig. 1 is NFC antenna structural representation of the present invention;
Fig. 2 is the Distribution of Magnetic Field schematic diagram of NFC antenna structure of the present invention;
Fig. 3 is the equivalent circuit diagram of typical N FC antenna;
Fig. 4 is the NFC antenna Smith chart that the present invention does not add inductance and electric capacity;
Fig. 5 is the NFC antenna Smith curve figure after the present invention only adds two inductance;
Fig. 6 is the NFC antenna Smith curve figure after the present invention adds two inductance and electric capacity;
Fig. 7 is the structural representation of intelligent watch one embodiment of the present invention;
Fig. 8 is the structural representation of another embodiment of intelligent watch of the present invention;
Fig. 9 is the internal structure schematic diagram of the NFC antenna of Fig. 8.
Label declaration:
1, wire coil/becket; 2, pcb board; 3, framework; 4, table cover;
5, chip assembly; 6, bonnet; 7, watchband; 8, shift knob;
9, magnetic field; 11, the first current feed department; 12, the second current feed department; 13, the first inductance;
14, the second inductance; 15, electric capacity; 16, opening.
Embodiment
By describing technology contents of the present invention in detail, realized object and effect, accompanying drawing is coordinated to be explained below in conjunction with execution mode.
The design of most critical of the present invention is: the aerial radiation main body of NFC antenna assembly adopts single turn non-close wire coil or becket design, and structure is simpler, area occupied and space little, be conducive to thinner and miniaturized design; Adopt the first inductance of serial connection and the second inductance can increase the inductance value that antenna radiator is single turn non-close wire coil or becket, the capacitance of antenna radiator can be increased by electric capacity, the number of turn of wire coil can be reduced to single turn, area shared by this antenna and small volume, structure is simpler, be suitable for Wearable as intelligent watch, and communication quality is reliable.
Please refer to Fig. 1 to Fig. 2, a kind of NFC antenna structure for wearable device, comprise pcb board 2 and NFC antenna assembly, described NFC antenna assembly comprises aerial radiation main body, changes regulating circuit assembly, first current feed department 11 and second current feed department 12 of radiating principal inductance value and capacitance;
Described aerial radiation main body is single turn wire coil 1; Described wire coil 1 is provided with opening 16, and wire coil 1 is divided into nonocclusive circulus by described opening 16;
Described regulating circuit assembly comprises the first inductance 13, second inductance 14 and electric capacity 15, and one end of described first inductance 13 is connected with the first current feed department 11, and the other end of the first inductance 13 is connected with one end of wire coil 1; One end of described second inductance 14 is connected with the second current feed department 12, and the other end of the second inductance 14 is connected with the other end of wire coil 1; One end of described electric capacity 15 is connected on the contact that the first inductance 13 is connected with the first current feed department 11, and the other end is connected on the contact that the second inductance 14 is connected with the second current feed department 12.Above-mentioned inductance and electric capacity are SMD inductance and electric capacity.
In addition, the first inductance and the second inductance are just in order to increase the inductance value based on single turn wire coil NFC antenna, and the form connecting inductance is that the first inductance and the second inductance balance are distributed in the two ends of becket feed.But it is to be noted that the connected mode of inductance is not unique, such as also only can add an equivalence in one end of feed in the inductance (part by wire coil conductor replaces by the inductance now not adding the feed end of inductance) of the first inductance and the second inductance sum, the connected mode of electric capacity is constant simultaneously, or between leap two distributing points.
Consult Fig. 2, Fig. 2 is the electromagnetism distribution schematic diagram of NFC antenna structure, and as can be seen from Figure 2, the magnetic field 9 that the aerial radiation main body in NFC antenna assembly produces is around wire coil.
All NFC antenna can be equivalent to circuit diagram as shown in Figure 3, and this circuit diagram comprises electric capacity Ca, resistance Ra and inductance L a, after resistance Ra is connected in series with inductance L a and electric capacity Ca connecing.According to the requirement of NFC antenna, the value of inductance L a, electric capacity Ca and resistance Ra is respectively 0.3-3uH, 3-30pF and 0.3-8 Ω.Because NFC antenna can replace with the equivalent electric circuit shown in Fig. 3, so when the inductance of NFC antenna itself and capacitance little of when can not meet the requirement of above-mentioned inductance and capacitance, we can add extra inductance and electric capacity in NFC antenna, and this is also one of the present invention's cardinal principle that can realize.In addition, the antenna self-resonant frequency inherently determined by electric capacity and inductance should be greater than the twice of NFC antenna operating frequency (13.56MHz).In order to meet the requirement of inductance, the length of antenna wants long enough, because inductance is directly proportional to the length of antenna.Be limited to the size of portable unit, general NFC antenna is of a size of 40mm*40mm, copper coil in traditional NFC antenna needs to enclose around 3-5, and to be used in mobile phone and to be not suitable in wearable device, and pass through the NFC antenna structure of this programme, only need the communication that can realize wearable device once circle copper coil.
From foregoing description, beneficial effect of the present invention is: the NFC antenna communication that the back side according to the scheme of Cell Phone Design, NFC antenna being positioned at wrist-watch in prior art if be different from causes is difficult to the problem realized, the invention provides a kind of NFC antenna structure for wearable device, do not need to add ferrite, can antenna structure be simplified; And aerial radiation main body adopts single turn non-close wire coil or becket design, and structure is simpler, area occupied and space little, be conducive to thinner and miniaturized design; The inductance that single number of turn coil produces and capacitance generally can not meet the requirement of NFC antenna, but the deficiency of its inductance and capacitance can be revised with regulating circuit, concrete the first inductance 13 of serial connection and the second inductance 14 of adopting increases the inductance value that radiant body is single turn non-close wire coil or becket, the capacitance of radiant body is increased by electric capacity, so the number of turn of wire coil can be reduced to single turn, area shared by this antenna and small volume, structure is simpler, and communication quality is reliable.
Further, the material of described wire coil 1 is copper.Certainly, outside copper removal, can also be other metal (as silver, nickel etc.) or other alloying metal.
Be below the NFC antenna model (diameter of wrist-watch is 40mm) of an intelligent watch as a concrete example so that the properties of this programme to be described.In order to meet NFC antenna design specification, need the inductance of use two 560nH and the electric capacity of a 5.6pF.Especially, the model that above-mentioned inductance uses field, village electronics (Murata) to provide is the inductor of LQW18CNR56J00D, and the D.C. resistance (0.48 Ω) of this inductor is very little.Fig. 4 is the antenna Smith curve figure not adding inductance and electric capacity, and as can be seen from Figure 4, the equivalent inductance value La that antenna records when 1MHz frequency is 126.33nH, and this inductance value is too little can not meet NFC antenna specification.Fig. 5 antenna Smith curve figure that to be the antenna Smith curve figure after only adding two inductance, Fig. 6 be after adding two inductance and an electric capacity.As can be known from Fig. 5 and Fig. 6, as long as add two inductance, the equivalent inductance value La that antenna records when 1MHz frequency is 1.37uH, and this inductance value can meet NFC antenna specification.In addition, then after adding electric capacity, the self-resonant frequency of this antenna reduces to 52.4MHz from 96MHz.The equivalent capacitance value using the NFC design guidance formulae discovery at grace intelligence Pu (NXP) to go out in this design is 6.72pF, and equivalent resistance Ra is 3.3 Ω, can meet the Antenna Specification of NFC preferably.In card model or label mode, the distance of reaction of NFC antenna scheme is 30mm, and this distance meets the requirement of watch design scheme completely.
Consult Fig. 7, a kind of intelligent watch, comprise table cover 4, framework 3, chip assembly 5, battery (not marking), bonnet 6, pcb board 2, antenna module and watchband 7, described table cover 4, framework 3 and bonnet 6 surround accommodation space, described chip assembly 5, pcb board 2, antenna module and battery are positioned at accommodation space, described watchband 7 arranges on the frame 3, described antenna module is positioned on pcb board 2, described antenna module is NFC antenna assembly, and described NFC antenna assembly comprises aerial radiation main body, regulating circuit assembly, the first current feed department 11 and the second current feed department 12;
Described aerial radiation main body is around pcb board 2 and is positioned at the single turn wire coil 1 of framework 3 inner surface, and described wire coil 1 is provided with opening 16, and wire coil 1 is divided into nonocclusive circulus by described opening 16;
Described regulating circuit assembly comprises the first inductance 13, second inductance 14 and electric capacity 15, and one end of described first inductance 13 is connected with the first current feed department 11, and the other end of the first inductance 13 is connected with one end of wire coil 1; One end of described second inductance 14 is connected with the second current feed department 12, and the other end of the second inductance 14 is connected with the other end of wire coil 1; One end of described electric capacity 15 is connected on the contact that the first inductance 13 is connected with the first current feed department 11, and the other end is connected on the contact that the second inductance 14 is connected with the second current feed department 12.
Further, the diameter of described wire coil 1 is greater than the diameter of pcb board 2, and leaves gap between wire coil 1 and pcb board 2, and the energy of wire coil 1 gives off (as shown in Figure 2) from gap.Especially, this structure does not need to use ferrite, can simplify antenna structure, save into product cost.
Further, the material of described wire coil 1 is copper.Certainly, outside copper removal, can also be other metal (as silver, nickel etc.) or other alloying metal.
Above-mentioned NFC antenna design, can also expand in the intelligent watch with decorative metals ring.
Consult Fig. 8 and Fig. 9, a kind of intelligent watch, comprise table cover 4, framework 3, chip assembly 5, battery, bonnet 6, pcb board 2, antenna module and watchband 7, described table cover 4, framework 3 and bonnet 6 surround accommodation space, described chip assembly 5, pcb board 2 and battery are positioned at accommodation space, described watchband 7 arranges on the frame 3, described antenna module is NFC antenna assembly, also comprise one around and be close to the becket 1 of framework 3 outer surface, described NFC antenna assembly comprises aerial radiation main body, regulating circuit assembly, the first current feed department 11 and the second current feed department 12;
Described aerial radiation main body is becket 1, and described becket 1 is provided with opening 16, and becket 1 is divided into nonocclusive circulus by described opening 16;
Described regulating circuit assembly comprises the first inductance 13, second inductance 14 and electric capacity 15, and one end of described first inductance 13 is connected with the first current feed department 11, and the other end of the first inductance 13 is connected with one end of becket 1; One end of described second inductance 14 is connected with the second current feed department 12, and the other end of the second inductance 14 is connected with the other end of becket 1; One end of described electric capacity 15 is connected on the contact that the first inductance 13 is connected with the first current feed department 11, and the other end is connected on the contact that the second inductance 14 is connected with the second current feed department 12.
Further, also comprise a shift knob 8, described shift knob 8 is positioned at opening 16 place.
In sum, NFC antenna structure for wearable device provided by the invention, the aerial radiation main body of NFC antenna assembly adopts single turn non-close wire coil or becket design, and structure is simpler, area occupied and space little, be conducive to thinner and miniaturized design; Adopt the first inductance of serial connection and the second inductance can increase the inductance value that radiant body is single turn non-close wire coil or becket, can be increased the capacitance of radiant body by electric capacity, its advantage major embodiment is as follows:
1, this programme is a kind of NFC antenna of Simple first design of applicable intelligent watch;
2, this programme does not need to add ferrite, can reduce production cost, and can simplified structure;
3, this programme is easily implemented, and the copper coil as aerial radiation main body only needs a circle;
4, in this programme by the inductance in regulating circuit and electric capacity to meet the requirement of NFC antenna to inductance and electric capacity;
5, this programme is also applicable to the intelligent watch with non-close becket, and now this nonocclusive becket is as unique aerial radiation main body of NFC antenna.
6, except the wrist-watch of this programme, this NFC antenna structure can also be applied in other wearable device.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing specification of the present invention 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 invention.
Claims (5)
1. for a NFC antenna structure for wearable device, it is characterized in that, comprise aerial radiation main body, regulating circuit assembly, the first current feed department and the second current feed department;
Described aerial radiation main body is single metal coil; Described wire coil is provided with opening, and wire coil is divided into nonocclusive circulus by described opening;
Described regulating circuit assembly comprises the first inductance, the second inductance and electric capacity, and one end of described first inductance is connected with the first current feed department, and the other end of the first inductance is connected with one end of wire coil; One end of described second inductance is connected with the second current feed department, and the other end of the second inductance is connected with the other end of wire coil; One end of described electric capacity is connected on the contact that the first inductance is connected with the first current feed department, and the other end is connected on the contact that the second inductance is connected with the second current feed department.
2. an application rights requires the intelligent watch for the NFC antenna structure of wearable device described in 1, comprise table cover, framework, chip assembly, battery, bonnet, pcb board, antenna module and watchband, described table cover, framework and bonnet surround accommodation space, described chip assembly, pcb board, antenna module and battery are positioned at accommodation space, described watchband is arranged on framework, it is characterized in that, described antenna module is NFC antenna assembly, and described NFC antenna assembly comprises aerial radiation main body, regulating circuit assembly, the first current feed department and the second current feed department;
Described aerial radiation main body is around pcb board and is positioned at the single turn wire coil of frame inner surface, and described wire coil is provided with opening, and wire coil is divided into nonocclusive circulus by described opening;
Described regulating circuit assembly comprises the first inductance, the second inductance and electric capacity, and one end of described first inductance is connected with the first current feed department, and the other end of the first inductance is connected with one end of wire coil; One end of described second inductance is connected with the second current feed department, and the other end of the second inductance is connected with the other end of wire coil; One end of described electric capacity is connected on the contact that the first inductance is connected with the first current feed department, and the other end is connected on the contact that the second inductance is connected with the second current feed department.
3. intelligent watch according to claim 2, is characterized in that, the diameter of described wire coil is greater than the diameter of pcb board, and leaves gap between wire coil and pcb board, and the energy of wire coil gives off from gap.
4. an intelligent watch, comprise table cover, framework, chip assembly, battery, bonnet, pcb board, antenna module and watchband, described table cover, framework and bonnet surround accommodation space, described chip assembly, pcb board and battery are positioned at accommodation space, described watchband is arranged on framework, it is characterized in that, also comprise one around and be close to the becket of frame outer surface, described antenna module is NFC antenna assembly, and described NFC antenna assembly comprises aerial radiation main body, regulating circuit assembly, the first current feed department and the second current feed department;
Described aerial radiation main body is becket, and described becket is provided with opening, and becket is divided into nonocclusive circulus by described opening;
Described regulating circuit assembly comprises the first inductance, the second inductance and electric capacity, and one end of described first inductance is connected with the first current feed department, and the other end of the first inductance is connected with one end of becket; One end of described second inductance is connected with the second current feed department, and the other end of the second inductance is connected with the other end of becket; One end of described electric capacity is connected on the contact that the first inductance is connected with the first current feed department, and the other end is connected on the contact that the second inductance is connected with the second current feed department.
5. intelligent watch according to claim 4, is characterized in that, also comprises a shift knob, and described shift knob is positioned at opening part.
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| CN201410763777.3A CN104466363A (en) | 2014-12-11 | 2014-12-11 | NFC antenna structure applied to wearable device and intelligent watch |
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| CN201410763777.3A CN104466363A (en) | 2014-12-11 | 2014-12-11 | NFC antenna structure applied to wearable device and intelligent watch |
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| CN106299606A (en) * | 2016-09-30 | 2017-01-04 | 青岛海信移动通信技术股份有限公司 | A kind of intelligent watch NFC antenna device and intelligent watch |
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