CN206595381U - A kind of multi-resonant ultra wide band NFC antenna system - Google Patents
A kind of multi-resonant ultra wide band NFC antenna system Download PDFInfo
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- CN206595381U CN206595381U CN201720392436.9U CN201720392436U CN206595381U CN 206595381 U CN206595381 U CN 206595381U CN 201720392436 U CN201720392436 U CN 201720392436U CN 206595381 U CN206595381 U CN 206595381U
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Abstract
The utility model provides a kind of multi-resonant ultra wide band NFC antenna system, including the pcb board in mobile phone, it is formed with the pcb board in lying copper region and clearance zone, the lying copper region and is provided with a NFC chip and at least one NFC antenna being connected by match circuit with the NFC chip；Be provided with an at least electric capacity on the clearance zone, the electric capacity two ends are connected respectively to lying copper region, and the electric capacity two ends be connected with lying copper region after an opening is formed on clearance zone towards the open region of NFC antenna.The utility model produces the first resonance by the NFC chip and NFC antenna of lying copper region on pcb board, induced-current is excited in lying copper region simultaneously, electric capacity one current loop of formation that the induced-current passes through in lying copper region, clearance zone, correspondence is in electric capacity with producing the second resonance being superimposed with the first resonance on lying copper region connecting line.The utility model is not only simple in construction, it is easy to accomplish；And cover bandwidth, improve the magnetic field intensity and operating distance of working frequency section, the NFC performances based on shell material matter electronic equipment after metal are drastically increased, brings and more preferably experiences to user.
Description
Technical field
The utility model belongs to technical field of near field communication, and in particular to be a kind of multi-resonant ultra wide band NFC antenna system
System.
Background technology
NFC technology be by non-contact radio-frequency recognizes (RFID) and interconnect Technology Integration develop,
Working frequency is 13.56MHz, and read-write, snap gauge can be supported to fit the point-to-point three kinds of mode of operations of P2P altogether.Wherein read-write mode ratio
Such as：Mass transit card remaining sum can be read with NFC global functions mobile phone and it is supplemented with money；Snap gauge simulation models is such as：With NFC global function hands
Machine can be used as mass transit card and bank card；P2P ad hoc modes are such as：Two can be rapid with NFC global functions mobile phone
Match and transmit file.Because NFC technique can be identified and data exchange with compatible equipment in short distance, so carrying
The Full Featured mobile phones of NFC may be used as airport boarding checking, mansion gate inhibition's key, traffic all-purpose card, credit card, Payment Card etc.,
Therefore the life to consumer provides great convenience.
However, all kinds of mass transit cards or bank card frequency range in existing market are from 13-16MHz, when complete with NFC
The electronic device works of function deviate 13.56MHz such as 15.3MHz farther out when read-write mode is interacted with all kinds of cards
Mass transit card, the operating distance of itself and mobile phone will shorten and can not even be recognized by mobile phone read-write, so as to bring poor user body
Test.
In order to solve the above problems, present applicant proposes a kind of multi-resonant ultra wide band NFC antenna design, it will be produced
At least two resonance, cover more broadband, improve working frequency section magnetic field intensity, can interact and have more with different frequency card
High workload distance, drastically increases NFC performances, brings and more preferably experiences to user.
Utility model content
Therefore, the purpose of this utility model is to provide a kind of covering bandwidth, operating distance high multi-resonant ultra wide band
NFC antenna system.
The purpose of this utility model is achieved through the following technical solutions.
It is formed with a kind of multi-resonant ultra wide band NFC antenna system, including the pcb board in mobile phone, the pcb board
A NFC chip and at least one NFC antenna being connected with the NFC chip are provided with lying copper region and clearance zone, the lying copper region；
An at least electric capacity is provided with the clearance zone, the electric capacity two ends are connected respectively to lying copper region, and the electric capacity
Two ends form an opening towards the open region of NFC antenna on clearance zone after being connected with lying copper region.
Preferably, the clearance zone is located on the outside of lying copper region, and a NFC chip and one NFC days are provided with the lying copper region
Line, the NFC chip is connected by a match circuit with the NFC antenna, and NFC chip, match circuit and NFC antenna are formed
First resonant current loop；
It is provided with an electric capacity on the clearance zone, the electric capacity two ends are respectively connected to by a microstrip transmission line described covers copper
Area, the lying copper region, two microstrip transmission lines and electric capacity the second resonant current loop of formation；
Wherein, the NFC antenna is located in the opening bearing of trend of the open region, and NFC chip passes through the matching electricity
Road can make NFC antenna produce the first resonance, and NFC antenna excites induced-current in pcb board lying copper region, and the induced-current is flowed through
Microstrip transmission line and electric capacity, can make two microstrip transmission lines produce the second resonance being superimposed with the first resonance by adjusting electric capacity.
Preferably, the clearance zone is located on the outside of lying copper region, and a NFC chip and two series connection are provided with the lying copper region
NFC antenna, the NFC chip by a match circuit with described two series connection NFC antennas be connected, and NFC chip, match circuit and
Two NFC antennas the first resonant current loop of formation；
It is provided with an electric capacity on the clearance zone, the electric capacity two ends are respectively connected to by a microstrip transmission line described covers copper
Area, the lying copper region, two microstrip transmission lines and electric capacity the second resonant current loop of formation；
Wherein, two NFC antenna is respectively positioned in the opening bearing of trend of the open region, and NFC chip passes through described
With circuit two NFC antennas can be made to produce the first resonance, and NFC antenna excites induced-current in pcb board lying copper region, the induced electricity
Stream flows through microstrip transmission line and electric capacity, by adjusting electric capacity two microstrip transmission lines can be made to produce be superimposed with the first resonance second humorous
Shake.
Preferably, the clearance zone is located on the outside of lying copper region, and a NFC chip and one NFC days are provided with the lying copper region
Line, the NFC chip is connected by a match circuit with the NFC antenna, and NFC chip, match circuit and NFC antenna are formed
First resonant current loop；
One first electric capacity is provided with the clearance zone, the first electric capacity two ends are respectively connected by one first microstrip transmission line
It is connected to the lying copper region, the lying copper region, two first microstrip transmission lines and the first electric capacity the second resonant current loop of formation；
One second electric capacity is provided with the clearance zone, the second electric capacity two ends are respectively connected by one second microstrip transmission line
It is connected to the lying copper region, the lying copper region, two second microstrip transmission lines and the second electric capacity the 3rd resonant current loop of formation；
Wherein, second resonant current loop is located in the 3rd resonant current loop, and the NFC antenna is positioned at described
In the opening bearing of trend of the corresponding open region of second resonant current loop, NFC chip can be made NFC days by the match circuit
Line produces the first resonance, and NFC antenna excites induced-current in pcb board lying copper region, and it is micro- that the induced-current flows through two first
Band transmission line and the first electric capacity, can make two first microstrip transmission lines produce the second resonance by adjusting the first electric capacity；The sensing
Electric current flows through two second microstrip transmission lines and the second electric capacity, by adjusting the second electric capacity two second microstrip transmission lines can be made to produce the
Three resonance；First resonance, the second resonance, the superposition of the 3rd resonance.
Preferably, a NFC chip and a NFC antenna are provided with the lying copper region, the NFC chip passes through a matching electricity
Road is connected with the NFC antenna, and NFC chip, match circuit and NFC antenna the first resonant current loop of formation；
The clearance zone is arranged in lying copper region, and an opening towards lying copper region side is formed with clearance zone, and this is opened
Intraoral to be provided with an electric capacity, the electric capacity two ends are respectively connected to the lying copper region of opening both sides by a microstrip transmission line, described to cover
Tong Qu, two microstrip transmission lines and electric capacity the second resonant current loop of formation；
Wherein, the NFC antenna part is located in the clearance zone, and NFC chip can be made NFC days by the match circuit
Line produces the first resonance, and NFC antenna excites induced-current in pcb board lying copper region, and the induced-current flows through micro-strip transmission
Line and electric capacity, can make two microstrip transmission lines produce the second resonance being superimposed with the first resonance by adjusting electric capacity.
Preferably, a NFC chip and a NFC antenna are provided with the lying copper region, the NFC chip passes through a matching electricity
Road is connected with the NFC antenna, and NFC chip, match circuit and NFC antenna the first resonant current loop of formation；
The clearance zone is arranged in lying copper region, and a seam extended on the outside of lying copper region is provided with the clearance zone
The electric capacity that a two ends are connected with gap both sides lying copper region respectively is provided with gap, the gap, the lying copper region and electric capacity are formed
Second resonant current loop；
Wherein, the NFC antenna part is located in the clearance zone, and NFC chip can be made NFC days by the match circuit
Line produces the first resonance, and NFC antenna excites induced-current in pcb board lying copper region, and the induced-current flows through electric capacity, passed through
Regulation electric capacity can produce the second resonance being superimposed with the first resonance.
Preferably, the NFC antenna includes a magnet and winding coil on the magnet, the coil with it is described
NFC chip is connected.
Preferably, the coil include helical winding, " Z " font coil, " 8 " font coils, " O " font coil, square
Shape coil or irregular winding mode coil.
Preferably, the NFC antenna include a magnet, the first dielectric layer above magnet and positioned at magnet just under
Second dielectric layer of side；The upper surface of first dielectric layer is provided with first coil, the magnet around being equipped with second
Coil, the second dielectric layer bottom be provided with first cross pore electrod and second cross pore electrod, described second coil one end with
First crosses pore electrod connection, and the other end is connected with first coil one end, and the other end of first coil and second crosses pore electrod company
Connect.
Preferably, the NFC antenna includes a magnet and the dielectric layer immediately below magnet；The magnet is by first
Magnetosphere, the second magnetosphere, the 3rd magnetosphere, the 4th magnetosphere, the 5th magnetosphere and the 6th magnetosphere superposition group from top to bottom
Into the dielectric layer bottom is provided with the first pore electrod and second excessively and crosses pore electrod；
Around being equipped with first coil on first magnetosphere and the 6th magnetosphere, the second magnetosphere upper surface sets the
Two coil, the 3rd magnetosphere upper surface sets tertiary coil, and the 4th magnetosphere upper surface is set on the 4th coil, the 5th magnetosphere
Surface sets the 5th coil；
Described 5th coil one end is crossed pore electrod with first and is connected, and the other end is connected with the 4th coil one end, and the described 4th
The coil other end is connected with tertiary coil one end, and the tertiary coil other end is connected with second coil one end, and the second coil is another
One end is connected with positioned at first coil one end of the first magnetosphere upper surface, and first coil sequentially pass through the second coil inside,
Inside 6th magnetosphere bottom, tertiary coil, the first magnetosphere upper surface, inside tertiary coil, the 6th magnetosphere bottom, the 4th
Coil inside, the first magnetosphere upper surface, the 4th coil inside, the 6th magnetosphere bottom, the 5th coil inside, the first magnetosphere
Upper surface, the 5th coil inside, cross pore electrod with the second of the 6th magnetosphere bottom and are connected.
The utility model produces the first resonance by the NFC chip and NFC antenna of lying copper region on pcb board, while covering copper
Induced-current is excited in area, the induced-current is right by electric capacity one current loop of formation in clearance zone on lying copper region, pcb board
Should be in electric capacity with producing the second resonance being superimposed with the first resonance on lying copper region connecting line.Compared with prior art, this practicality is new
Type is not only simple in construction, it is easy to accomplish；And cover bandwidth, improve the magnetic field intensity and operating distance of working frequency section,
The NFC performances based on shell material matter electronic equipment after metal are drastically increased, brings and more preferably experiences to user.
Brief description of the drawings
Fig. 1 is the utility model NFC antenna system construction drawing；
Fig. 2 is CURRENT DISTRIBUTION schematic diagram under the resonant frequency of the utility model first；
Fig. 3 is magnetic field distribution figure under the resonant frequency of the utility model first；
Fig. 4 is CURRENT DISTRIBUTION schematic diagram under the resonant frequency of the utility model second；
Fig. 5 is magnetic field distribution figure under the resonant frequency of the utility model second；
Fig. 6 is the utility model single resonance and double resonance NFC antenna impedance real part and frequency relation curve contrast schematic diagram；
Fig. 7 is the utility model NFC antenna structural representation one；
Fig. 8 is the utility model NFC antenna structural representation two；
Fig. 9 is the utility model the second resonance producing method structural representation one；
Figure 10 is the utility model the second resonance producing method structural representation two；
Figure 11 is two NFC antenna cascaded structure schematic diagrames of the utility model；
Figure 12 is double resonance Smith experimental result pictures；
Figure 13 is the resonance producing method structure chart of the utility model three；
Figure 14 is the utility model single resonance and three resonance NFC antenna impedance real parts and frequency relation curve contrast signal
Figure.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
The utility model provides a kind of multi-resonant ultra wide band NFC antenna system, and it includes the PCB being arranged in mobile phone
Be formed with plate, the pcb board in lying copper region and clearance zone, the lying copper region be provided with a NFC chip and at least one with it is described
The NFC antenna of NFC chip connection；An at least electric capacity is provided with the clearance zone, the electric capacity two ends, which are connected respectively to, covers copper
Area, and the electric capacity two ends be connected with lying copper region after an opening is formed on clearance zone towards the open region of NFC antenna.The day
Linear system system has simple in construction, realization easy, can be greatly enhanced NFC performances of shell material matter electronic equipment etc. after metal excellent
Point.
Embodiment one
Refer to shown in Fig. 1, Fig. 1 is the utility model multi-resonant ultra wide band NFC antenna system construction drawing.The wherein NFC
Antenna system includes a pcb board, and pcb board correspondence is arranged in mobile phone, and it includes lying copper region 100 and clearance zone 101.Cover
Copper area 100 is layers of copper region, and clearance zone 101 is made up of medium, and medium can be resin, glass, air, plastics, and foam etc. is non-
The composite of metal material or its composition, it corresponds to the substrate layer of pcb board.
Clearance zone is located at the outside of lying copper region in the present embodiment, and a mobile phone NFC core is correspondingly arranged in lying copper region 100
Piece 1 and a NFC antenna 3, are connected between NFC chip 1 and NFC antenna 3 by a match circuit, to form the first resonance electricity
Flow back to road.NFC chip can be using grace intelligence Pu, Samsung, Botong, Lian Fake, STMicw Electronics, Fudan University's microelectronics, female sharp etc. half
Conductor manufacturer chip, the present embodiment explanation by taking grace intelligence Pu PN548 as an example；Magnet of the NFC antenna 3 by coil and in the coil
Composition.
An electric capacity 2 is provided with clearance zone 101, the one end of electric capacity 2 is connected by microstrip transmission line 102 with lying copper region 100,
The other end is connected by microstrip transmission line 102 ' with lying copper region 100, and electric capacity 2 and microstrip transmission line 102,102 ' are in clearance zone
An opening is formed on 101 towards the open region of NFC antenna, is located in the opening bearing of trend of the open region within NFC days 3；And cover
Copper area 100, microstrip transmission line 102, electric capacity 2, microstrip transmission line 102 ' are correspondingly formed the second resonant current loop.
The card 9 with mobile phone interaction is also placed with a certain distance from pcb board, the card 9 is by the He of card NFC chip 8
Card coil 8 ' is constituted, and can be sequentially placed multiple cards in the present embodiment, is mainly used in different frequency card distance test.
The operation principle of the present embodiment antenna system is：Electric signal is sent from the transmitting terminal of mobile phone NFC chip 1, adjusts hand
The periphery match circuit of machine NFC chip 1 makes the resonance of NFC antenna 3 in first resonance 13.5MHz or so, and NFC antenna 3 is in pcb board
Induced-current is excited in lying copper region 100, now, the one side of pcb board lying copper region 100 and NFC antenna 3 will be believed near field form together
Number " transmission " is to receiving device and interacts, and electric current flows to the He of microstrip transmission line 102 in another aspect pcb board lying copper region 100
102 ' and electric capacity 2 and constitute a current loop, make the resonance of microstrip transmission line 102 and 102 ' in the second resonance by adjusting electric capacity 2
15MHz or so, the second resonance is superimposed with the first resonance, covers more broadband, in 13-15.5MHz frequency ranges, improves magnetic field intensity,
So as to improve NFC operating distances.
It should be noted that the first resonant frequency is that f1 (13.5MHz) is f2 less than the second resonant frequency in the present embodiment
(15MHz).But the first resonant frequency is that f1 can also be f2, the first resonance more than the second resonant frequency in other embodiments
Depending on frequency f1 and the second resonant frequency f2 concrete numerical value can be according to actual use situations.
As shown in Fig. 2~Fig. 5, Fig. 2 is CURRENT DISTRIBUTION schematic diagram under the resonant frequency of the utility model double resonance first；Fig. 3
For magnetic field distribution figure under the resonant frequency of the utility model double resonance first；Fig. 4 is the resonance of the utility model double resonance second
CURRENT DISTRIBUTION schematic diagram under frequency；Fig. 5 is magnetic field distribution figure under the resonant frequency of the utility model double resonance second.
Electric current is more than on Fig. 2 microstrip transmission lines 102 and 102 ' on comparison diagram 2 and Fig. 4, Fig. 4 microstrip transmission line 102 and 102 '
Electric current.As described above, because the second resonance 15MHz is to be produced by microstrip transmission line 102 and 102 ' with electric capacity 2, so the second resonance
Electric current is better than under the first resonant frequency on microstrip transmission line 102 and 102 ' under frequency.
Nearby magnetic field intensity is more than the He of Fig. 3 microstrip transmission lines 102 for comparison diagram 3 and Fig. 5, Fig. 5 microstrip transmission line 102 and 102 '
102 ' neighbouring magnetic field intensities, reason ibid, because the second resonance 15MHz is to be produced by microstrip transmission line 102 and 102 ' with electric capacity 2,
So under the second resonant frequency microstrip transmission line 102 and 102 ' nearby magnetic field intensity is better than under the first resonant frequency.
As shown in fig. 6, Fig. 6 is the utility model single resonance and double resonance NFC antenna impedance real part and frequency relation curve
Contrast schematic diagram.Wherein solid line is that (single resonance is only double resonance first for single resonance NFC antenna impedance real part and frequency curve chart
Resonance), dotted line is double resonance NFC antenna impedance real part and frequency curve chart, and dotted line compares solid line, and it has more Frequency points to connect
Under nearly 30 Ω, i.e. double resonance state, band bandwidth is widened.(PN548 mobile phones NFC chip requirement in grace intelligence Pu is in working frequency point
Antenna impedance regulation need to be arrived 30+j0 Ω, reach and match with NFC chip 1, reduce reflection, energy maximum transmitted).
It should be noted that NFC antenna is made up of magnet and the coil being wound on the magnet in the present embodiment, therefore
Antenna can have multiple choices mode, be done further using different NFC antennas below in conjunction with 7~8 pairs of the present embodiment of accompanying drawing
Explanation.
As shown in fig. 7, Fig. 7 is the utility model NFC antenna structural representation one.Wherein the NFC antenna include magnet 1b,
The first dielectric layer 1a above magnet 1b and the second dielectric layer immediately below magnet (or insulation) 4.
First dielectric layer 1a upper surface is provided with first coil (being serially connected by coil 31/32), the magnet 1b
On around being equipped with the second coil (by coil 23,24,25,26 around forming), wherein, line segment 20 is connected by 21 with 30, line segment 32
It is connected by 33 with 22.
The bottom of second dielectric layer 4 be provided with first cross pore electrod 5a, the first outer electrode 6a, second cross pore electrod 5b and
Second outer electrode 6b, line segment 20 is connected with 5a, and 27 are connected with 5b；Outer electrode 6a and 6b, the i.e. distributing point of NFC antenna 3.
As shown in figure 8, Fig. 8 is the utility model NFC antenna structural representation two.NFC antenna includes a magnet and is located at
Dielectric layer 4 immediately below magnet.
Magnet is by the first magnetosphere 1a, the second magnetosphere 1b, the 3rd magnetosphere 1c, the 4th magnetosphere 1d, the 5th magnetosphere
1e and the 6th magnetosphere 1f are superimposed composition from top to bottom, and the bottom of dielectric layer 4 is provided with first and crosses pore electrod 5a, outside first
Portion electrode 6a, second cross pore electrod 5b and the second outer electrode 6b；Outer electrode 6a and 6b, the i.e. distributing point of NFC antenna 3.
Around being equipped with first coil (21a/24a/21b/24b), described second on first magnetosphere 1a and the 6th magnetosphere 1f
Magnetosphere 1b upper surfaces set the second coil 31, and the 3rd magnetosphere 1c upper surfaces are set on tertiary coil 32, the 4th magnetosphere 1d
Surface sets the 4th coil 33, and the 5th magnetosphere 1e upper surfaces set the 5th coil 34 (31,/32,/33,/34 one coil of composition).
The one end of 5th coil 34 is crossed pore electrod 5a with first by line segment 34Va and is connected, and the other end passes through line segment 33Va and the
The one end of four coil 33 is connected, and the other end of the 4th coil 33 is connected by line segment 32Va with the one end of tertiary coil 32, described
The other end of tertiary coil 32 is connected by line segment 32Va with the one end of the second coil 31, and the other end of the second coil 31 passes through line segment
24Pa, 24Va and first coil line segment 24a connections, line segment 24a is by 24Pb and 24Vc with being located at the 6th magnetosphere 1f bottoms
24b connections, and 24b is sequentially passed through inside tertiary coil 32, the first magnetosphere 1a upper surfaces, inside tertiary coil 32, the 6th
Inside magnetosphere 1f bottoms, the 4th coil 33, the first magnetosphere 1a upper surfaces, inside the 4th coil 33, the 6th magnetosphere 1f bottoms
Inside portion, the 5th coil 34, the first magnetosphere 1a upper surfaces, inside the 5th coil 34, second with the 6th magnetosphere 1f bottoms
Cross pore electrod 5b connections.
Although NFC antenna is as shown in Figure 7 and Figure 8 in the present embodiment, (coil can be in pcb board lying copper region domain for any coil
Excite the electric current favourable to antenna) include but is not limited to spiral, zigzag, " 8 " fonts, O fonts, rectangle and it is irregular around
Line mode coil etc. includes but is not limited to the appropriate stacking such as ferrite, nanocrystalline, amorphous, silicon steel and arrangement with magnetic material
The NFC antenna constituted can reach the similar effect of this case.
Embodiment two
As shown in figure 9, Fig. 9 is the utility model the second resonance producing method structural representation one.The present embodiment lying copper region
A NFC chip 1 and a NFC antenna 3 are provided with 100, the NFC chip 1 passes through a match circuit and described NFC days
Line 3 is connected, and NFC chip 1, match circuit and the first resonant current loop of formation of NFC antenna 3.
Clearance zone 101 is arranged in lying copper region 100 in the present embodiment, and a direction is formed with clearance zone 101 covers copper
It is provided with an electric capacity 2 in the opening of the side of area 100, the opening, one end of the electric capacity 2 is by microstrip transmission line 102 with covering
Copper area 100 is connected, and the other end is connected by microstrip transmission line 102 ' with lying copper region 100, and electric capacity 2, microstrip transmission line 102,
102 ' and 100 liang of one openings of opposition contact sides formation of clearance zone 101 and lying copper region towards the open region of NFC antenna 3, NFC
Its 3 part is located in open region；And lying copper region 100, microstrip transmission line 102, electric capacity 2, microstrip transmission line 102 ' are correspondingly formed
Two resonant current loops.
The present embodiment operation principle is similar with above-described embodiment one, does not repeat herein.
Embodiment three
As shown in Figure 10, Figure 10 is the utility model the second resonance producing method structural representation two.The present embodiment covers copper
A NFC chip 1 and a NFC antenna 3 are provided with area 100, the NFC chip 1 passes through a match circuit and the NFC
Antenna 3 is connected, and NFC chip 1, match circuit and the first resonant current loop of formation of NFC antenna 3.
Clearance zone 101 is arranged in lying copper region 100 in the present embodiment, and an extension is provided with the clearance zone 101
The electricity that a two ends are connected with gap both sides lying copper region 100 respectively is provided with gap on the outside of lying copper region 100, the gap
Hold 2, the lying copper region 100 and electric capacity 2 form the second resonant current loop.
Wherein, the part of NFC antenna 3 is located in the clearance zone 101, and NFC chip 1 is by adjusting the match circuit
NFC antenna 3 can be made to produce the first resonance, and NFC antenna 3 excites induced-current, the induced electricity in pcb board lying copper region 100
Stream flows through electric capacity 2, and the second resonance being superimposed with the first resonance can be produced by adjusting electric capacity 2.
The present embodiment operation principle is similar with above-described embodiment one, does not repeat herein.
Example IV
As shown in figure 11, Figure 11 is two NFC antenna cascaded structure schematic diagrames of the utility model.Clearance zone in the present embodiment
101 are located at the NFC antenna 3 that a NFC chip 1 and two series connection are provided with the outside of lying copper region 100, the lying copper region 100, institute
NFC chip 1 is stated to be connected with described two series connection NFC antennas 3 by a match circuit, and NFC chip 1, match circuit and two NFC
The first resonant current loop of formation of antenna 3.
An electric capacity 2 is provided with clearance zone 101, one end of electric capacity 2 is connected by microstrip transmission line 102 with lying copper region 100
Connect, the other end is connected by microstrip transmission line 102 ' with lying copper region 100, and electric capacity 2, microstrip transmission line 102,102 ' and headroom
Area 101 forms an opening towards the open region of NFC antenna 3, the opening for being all located at the open region for NFC days 3 of two series connection
In bearing of trend；Lying copper region 100, microstrip transmission line 102, electric capacity 2, the second resonant current loop of formation of microstrip transmission line 102 '.
Two NFC antennas 3 are respectively positioned in the opening bearing of trend of the open region, and NFC chip 1 is by adjusting the matching
Circuit can make two NFC antennas 3 produce the first resonance, and NFC antenna 3 excites induced-current in pcb board lying copper region 100, the sense
Induced current flows through microstrip transmission line 102,102 ' and electric capacity 2, by electric capacity 2 microstrip transmission line 102,102 ' can be made to produce and first
Second resonance of resonance superposition.
The present embodiment operation principle is similar with above-described embodiment one, does not repeat herein.
Figure 12 is double resonance Smith experimental result pictures.
Below with reference to following table combination above-described embodiment under single resonance (the only resonance of double resonance first) and double resonance
Four card response distances carry out comparative illustration.
It is can be seen that from above-mentioned Card Reader distance versus table by contrasting double resonance and single resonance under single antenna, four cards
Response distance respectively lifted 36.6%, 37.2%, 19.7%, 27.9%；By contrasting two antenna in series under double resonance
And single antenna, the response distance lifting 24.5%, 8.5%, 23.6%, 29.5% respectively of four cards.
Embodiment five
As shown in figure 13, Figure 13 is the resonance producing method structure chart of the utility model three.Clearance zone 101 in the present embodiment
In being provided with a NFC chip 1 and a NFC antenna 3 on the outside of lying copper region 100, lying copper region 100, the NFC chip 1 is led to
A match circuit is crossed to be connected with the NFC antenna 3, and NFC chip 1, match circuit and formation the first resonance electricity of NFC antenna 3
Flow back to road.
First electric capacity 2 is provided with clearance zone 101, the two ends of the first electric capacity 2 are respectively transmitted by first micro-strip
Line 102,102 ' is connected to lying copper region 100, and the lying copper region 100, the first microstrip transmission line 102,102 ' and the first electric capacity 2 are formed
Second resonant current loop；
Second electric capacity 2 ' is additionally provided with clearance zone 101, the two ends of the second electric capacity 2 ' are respectively passed by one second micro-strip
Defeated line 103,103 ' is connected to lying copper region 100, the lying copper region 100, the second microstrip transmission line 103,103 ' and the second electric capacity 2 '
Form the 3rd resonant current loop；
Wherein, the second resonant current loop is located in the 3rd resonant current loop, and NFC antenna 3 is humorous positioned at described second
In the opening bearing of trend of the corresponding open region of the current loop that shakes, NFC chip 1 can produce NFC antenna 3 by the match circuit
Raw first resonance, and NFC antenna 3 excites induced-current in pcb board lying copper region 100, the induced-current flows through the first micro-strip
Transmission line 102,102 ' and the first electric capacity 2, can make the first microstrip transmission line 102,102 ' produce second humorous by the first electric capacity 2
Shake；Induced-current additionally flows through the second microstrip transmission line 103,103 ' and the second electric capacity 2 ' simultaneously, can make by the second electric capacity 2 '
Two microstrip transmission lines 103,103 ' produce the 3rd resonance；Wherein the first resonance, the second resonance, the superposition of the 3rd resonance.
The present embodiment operation principle is similar with above-described embodiment one, does not repeat herein.
Figure 14 is the utility model single resonance and three resonance NFC antenna impedance real parts and frequency relation curve contrast signal
Figure.
In summary, the utility model makes microstrip transmission line produce the second resonance (and the 3rd resonance) by adjusting electric capacity,
It has simple in construction, it is easy to accomplish advantage；And the utility model is by the superposition of multiple resonance, covering frequency band is realized
It is wider, the magnetic field intensity and operating distance of working frequency section are improved, drastically increases and is set based on shell material matter electronics after metal
Standby NFC performances, bring to user and more preferably experience.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of multi-resonant ultra wide band NFC antenna system, including the pcb board in mobile phone, it is characterised in that
Be formed with the pcb board in lying copper region and clearance zone, the lying copper region be provided with a NFC chip and at least one with it is described
The NFC antenna of NFC chip connection；
An at least electric capacity is provided with the clearance zone, the electric capacity two ends are connected respectively to lying copper region, and the electric capacity two ends
An opening is formed towards the open region of NFC antenna on clearance zone after being connected with lying copper region.
2. multi-resonant ultra wide band NFC antenna system as claimed in claim 1, it is characterised in that
The clearance zone is located on the outside of lying copper region, and a NFC chip and a NFC antenna, the NFC cores are provided with the lying copper region
Piece is connected by a match circuit with the NFC antenna, and NFC chip, match circuit and NFC antenna the first resonance current of formation
Loop；
An electric capacity is provided with the clearance zone, the electric capacity two ends are respectively connected to the lying copper region by a microstrip transmission line,
The lying copper region, two microstrip transmission lines and electric capacity the second resonant current loop of formation；
Wherein, the NFC antenna is located in the opening bearing of trend of the open region, and NFC chip can by the match circuit
NFC antenna is set to produce the first resonance, and NFC antenna excites induced-current in pcb board lying copper region, the induced-current flows through micro-strip
Transmission line and electric capacity, can make two microstrip transmission lines produce the second resonance being superimposed with the first resonance by adjusting electric capacity.
3. multi-resonant ultra wide band NFC antenna system as claimed in claim 1, it is characterised in that
The clearance zone is located on the outside of lying copper region, and the NFC antenna of a NFC chip and two series connection, institute are provided with the lying copper region
NFC chip is stated to be connected with described two series connection NFC antennas by a match circuit, and NFC chip, match circuit and two NFC antennas
Form the first resonant current loop；
An electric capacity is provided with the clearance zone, the electric capacity two ends are respectively connected to the lying copper region by a microstrip transmission line,
The lying copper region, two microstrip transmission lines and electric capacity the second resonant current loop of formation；
Wherein, two NFC antenna is respectively positioned in the opening bearing of trend of the open region, and NFC chip passes through the matching electricity
Road can make two NFC antennas produce the first resonance, and NFC antenna excites induced-current in pcb board lying copper region, the induced-current stream
Through microstrip transmission line and electric capacity, by adjusting electric capacity two microstrip transmission lines can be made to produce the second resonance being superimposed with the first resonance.
4. multi-resonant ultra wide band NFC antenna system as claimed in claim 1, it is characterised in that
The clearance zone is located on the outside of lying copper region, and a NFC chip and a NFC antenna, the NFC cores are provided with the lying copper region
Piece is connected by a match circuit with the NFC antenna, and NFC chip, match circuit and NFC antenna the first resonance current of formation
Loop；
One first electric capacity is provided with the clearance zone, the first electric capacity two ends are respectively connected to by one first microstrip transmission line
The lying copper region, the lying copper region, two first microstrip transmission lines and the first electric capacity the second resonant current loop of formation；
One second electric capacity is provided with the clearance zone, the second electric capacity two ends are respectively connected to by one second microstrip transmission line
The lying copper region, the lying copper region, two second microstrip transmission lines and the second electric capacity the 3rd resonant current loop of formation；
Wherein, second resonant current loop is located in the 3rd resonant current loop, and the NFC antenna is located at described second
In the opening bearing of trend of the corresponding open region of resonant current loop, NFC chip can produce NFC antenna by the match circuit
Raw first resonance, and NFC antenna excites induced-current in pcb board lying copper region, the induced-current flows through two first micro-strips biography
Defeated line and the first electric capacity, can make two first microstrip transmission lines produce the second resonance by adjusting the first electric capacity；The induced-current
Two second microstrip transmission lines and the second electric capacity are flowed through, by adjusting the second electric capacity the generation the 3rd of two second microstrip transmission lines can be made humorous
Shake；First resonance, the second resonance, the superposition of the 3rd resonance.
5. multi-resonant ultra wide band NFC antenna system as claimed in claim 1, it is characterised in that
A NFC chip and a NFC antenna are provided with the lying copper region, the NFC chip passes through a match circuit and the NFC
Antenna is connected, and NFC chip, match circuit and NFC antenna the first resonant current loop of formation；
The clearance zone is arranged in lying copper region, and is formed with clearance zone in an opening towards lying copper region side, the opening
It is provided with an electric capacity, the electric capacity two ends are respectively connected to the lying copper region of opening both sides by a microstrip transmission line, the lying copper region,
Two microstrip transmission lines and electric capacity the second resonant current loop of formation；
Wherein, the NFC antenna part is located in the clearance zone, and NFC chip can produce NFC antenna by the match circuit
Raw first resonance, and NFC antenna excites induced-current in pcb board lying copper region, the induced-current flow through microstrip transmission line and
Electric capacity, can make two microstrip transmission lines produce the second resonance being superimposed with the first resonance by adjusting electric capacity.
6. multi-resonant ultra wide band NFC antenna system as claimed in claim 1, it is characterised in that
A NFC chip and a NFC antenna are provided with the lying copper region, the NFC chip passes through a match circuit and the NFC
Antenna is connected, and NFC chip, match circuit and NFC antenna the first resonant current loop of formation；
The clearance zone is arranged in lying copper region, and a gap extended on the outside of lying copper region, institute are provided with the clearance zone
State and the electric capacity that a two ends are connected with gap both sides lying copper region respectively is provided with gap, the lying copper region and electric capacity formation second are humorous
Shake current loop；
Wherein, the NFC antenna part is located in the clearance zone, and NFC chip can produce NFC antenna by the match circuit
Raw first resonance, and NFC antenna excites induced-current in pcb board lying copper region, the induced-current flows through electric capacity, passes through regulation
Electric capacity can produce the second resonance being superimposed with the first resonance.
7. the multi-resonant ultra wide band NFC antenna system as described in claim 1~6 is any, it is characterised in that the NFC antenna
Including a coil magnet and winding on the magnet, the coil is connected with the NFC chip.
8. multi-resonant ultra wide band NFC antenna system as claimed in claim 7, it is characterised in that the coil includes spiral
Coil, " Z " font coil, " 8 " font coils, " O " font coil, square coil or irregular winding mode coil.
9. the multi-resonant ultra wide band NFC antenna system as described in claim 1~6 is any, it is characterised in that the NFC antenna
The first dielectric layer including a magnet, above magnet and the second dielectric layer immediately below magnet；Described first
The upper surface of dielectric layer is provided with first coil, the magnet around being equipped with the second coil, the second dielectric layer bottom
Be provided with first cross pore electrod and second cross pore electrod, described second coil one end with first cross pore electrod be connected, the other end and
First coil one end is connected, and the other end of first coil is crossed pore electrod with second and is connected.
10. the multi-resonant ultra wide band NFC antenna system as described in claim 1~6 is any, it is characterised in that the NFC antenna
Dielectric layer including a magnet and immediately below magnet；The magnet is by the first magnetosphere, the second magnetosphere, the 3rd magnetic
Layer, the 4th magnetosphere, the 5th magnetosphere and the 6th magnetosphere are superimposed composition from top to bottom, and the dielectric layer bottom is provided with
One, which crosses pore electrod and second, crosses pore electrod；
Around first coil is equipped with first magnetosphere and the 6th magnetosphere, the second magnetosphere upper surface sets the second line
Circle, the 3rd magnetosphere upper surface sets tertiary coil, and the 4th magnetosphere upper surface sets the 4th coil, the 5th magnetosphere upper surface
5th coil is set；
Described 5th coil one end is crossed pore electrod with first and is connected, and the other end is connected with the 4th coil one end, the 4th coil
The other end is connected with tertiary coil one end, and the tertiary coil other end is connected with second coil one end, the second coil other end
It is connected with positioned at first coil one end of the first magnetosphere upper surface, and first coil sequentially passes through the second coil inside, the 6th
Inside magnetosphere bottom, tertiary coil, the first magnetosphere upper surface, inside tertiary coil, the 6th magnetosphere bottom, the 4th coil
Inside, the first magnetosphere upper surface, the 4th coil inside, the 6th magnetosphere bottom, the 5th coil inside, the first magnetosphere upper table
Face, the 5th coil inside, cross pore electrod with the second of the 6th magnetosphere bottom and are connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720392436.9U CN206595381U (en) | 2017-04-14 | 2017-04-14 | A kind of multi-resonant ultra wide band NFC antenna system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720392436.9U CN206595381U (en) | 2017-04-14 | 2017-04-14 | A kind of multi-resonant ultra wide band NFC antenna system |
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| CN206595381U true CN206595381U (en) | 2017-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106910986A (en) * | 2017-04-14 | 2017-06-30 | 深圳市信维通信股份有限公司 | A kind of multi-resonant ultra wide band NFC antenna system |
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2017
- 2017-04-14 CN CN201720392436.9U patent/CN206595381U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106910986A (en) * | 2017-04-14 | 2017-06-30 | 深圳市信维通信股份有限公司 | A kind of multi-resonant ultra wide band NFC antenna system |
| CN106910986B (en) * | 2017-04-14 | 2023-10-13 | 深圳市信维通信股份有限公司 | Multi-resonance ultra-wideband NFC antenna system |
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