CN106972237A - Ultrawide band high performance NFC antenna system based on shell after metal - Google Patents
Ultrawide band high performance NFC antenna system based on shell after metal Download PDFInfo
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- CN106972237A CN106972237A CN201710244517.9A CN201710244517A CN106972237A CN 106972237 A CN106972237 A CN 106972237A CN 201710244517 A CN201710244517 A CN 201710244517A CN 106972237 A CN106972237 A CN 106972237A
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- shell
- metal
- resonance
- electric capacity
- nfc antenna
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
- H01Q1/244—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas extendable from a housing along a given path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
Abstract
The invention provides a kind of ultrawide band high performance NFC antenna system based on shell after metal, make NFC antenna resonance in the first resonant frequency by adjusting the match circuit being located between chip and NFC antenna, and NFC antenna excites shell after induced-current, one side metal to transmit a signal to receiving device near field form together with NFC antenna and interact after metal simultaneously on shell；On the other hand, electric current after metal on shell returns to after metal on shell after resonant member and the first regulation electric capacity and constitutes a current loop, the current loop resonance can be made in the second resonant frequency by the first regulation electric capacity, it is achieved thereby that the second resonance is superimposed with the first resonance.Compared with prior art, the present invention 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, so as to drastically increase the NFC performances based on shell material matter electronic equipment after metal, bring and more preferably experience to user.
Description
Technical field
The invention belongs to technical field of near field communication, and in particular to be antenna, furthermore, refer to one kind
Multi-resonant ultrawide band high performance NFC antenna system, mainly for the mobile terminal device with shell after metal.
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.Because NFC technique can be short
Distance is interior to be identified and data exchange with compatible equipment, so can substitute transportation card, silver with NFC Full functional electronics equipment
Row card, wallet, airport boarding card, mansion gate inhibition's key etc., the life to consumer provide great convenience.
On the other hand, metal material such as aluminium, magnesium, stainless steel or alloy etc. has more preferable relative to non-metallic material such as plastics
Gripping sense and drop resistant, anti-scratch performance, increasingly by consumers.In order to cater to consumer, many cell phone manufacturers such as China
For, apple, Samsung, OPPO, VIVO, Nokia etc. annual flagship mobile phone require to support NFC function and phone housing typically makes
Use metal material.
It is well known that NFC antenna is generally pasted onto on mobile phone battery cover, when mobile phone battery cover material is metal, it will greatly
Ground weakens even shielding NFC antenna signal, so in the case where mobile phone battery cover is metal material, how to design a high property
Can problem of the NFC antenna as many personnel research.
In order to solve the above problems, this case proposes a kind of multi-resonant ultrawide band high performance based on shell after metal NFC days
Line solution, it will produce at least two resonance, and cover more broadband, working frequency section magnetic field intensity be improved, so as to have
More high workload distance, drastically increases the NFC performances based on shell material matter electronic equipment after metal, more preferably body is brought to user
Test.
The content of the invention
Therefore, it is an object of the invention to provide a kind of ultrawide band high performance NFC antenna system based on shell after metal.
The purpose of the present invention is achieved through the following technical solutions.
A kind of ultrawide band high performance NFC antenna system based on shell after metal, including shell and nonmetallic rear shell after metal
Shell madial wall is provided with a NFC chip and a NFC antenna after the rear shell being formed by connecting, the metal, and the NFC antenna is by magnet
And the coil being wound on the magnet is constituted, and the coil is connected by a match circuit with the NFC chip；It is described non-
A resonant member is provided with after metal on shell, the resonant member one end is connected with shell after the metal, the other end passes through one first regulation
Electric capacity is connected with shell after the metal；Wherein, the NFC chip, match circuit, NFC antenna the first resonant current loop of formation,
NFC antenna is set to produce the first resonance by adjusting match circuit；Shell after the metal, resonant member, the first regulation electric capacity formation the
Two resonant current loops, adjusting electric capacity by regulation first makes resonant member produce the second resonance, and second resonance and first
Resonance is superimposed.
Preferably, the resonant member is cyclic metal piece or sheet metal part or strip metal part, described resonant member one end
Directly it is connected with shell after the metal, the other end is connected by one first regulation electric capacity with shell after the metal；And shell after metal,
Resonant member, first regulation electric capacity the second resonant current loop of formation, adjusting electric capacity by regulation first makes resonant member produce second
Resonance.
Preferably, the resonant member is cyclic metal piece or sheet metal part or strip metal part, described resonant member one end
It is connected by a bonding jumper with shell after the metal, the other end is connected by one first regulation electric capacity with shell after the metal；And
Shell, bonding jumper, resonant member, first regulation electric capacity the second resonant current loop of formation, electric capacity is adjusted by regulation first after metal
Resonant member is set to produce the second resonance.
Preferably, the resonant member include positioned at both sides and respectively with shell two ends are connected after metal cyclic metal piece and position
Strip metal part between two cyclic metal pieces, a seam is each formed between the strip metal part and the annular metal of both sides
Gap, described strip metal part one end is connected by the first bonding jumper with shell after metal, and the other end passes sequentially through the second bonding jumper,
One regulation electric capacity is connected with shell after the metal, and shell, the first bonding jumper, strip metal part, the second bonding jumper, first after metal
Electric capacity the second resonant current loop of formation is adjusted, adjusting electric capacity by regulation first makes strip metal part produce the second resonance.
Preferably, the coil is " Z " font coil, and the magnet, which is located at, to be somebody's turn to do in " Z " font coil, and should " Z " font
Coil is connected the top in the one end at edge shell noncontact face after magnet and metal close to shell after metal with nonmetallic rear shell, far
The one end at edge is connected with nonmetallic rear shell positioned at the lower section of magnet and shell contact surface after metal from shell after metal, both sides are by close
Shell is connected the one end at edge with nonmetallic rear shell and is in one end that nonmetallic rear shell is connected edge to away from shell after metal after metal
" Z " font is extended downwardly.
Preferably, the coil is " 8 "-shaped coil, and the magnet is located in " 8 "-shaped coil, and the figure of eight line
Circle is connected the one end at edge with nonmetallic rear shell close and far from shell after metal and is respectively positioned on magnet and shell noncontact face after metal
Top, and the middle of " 8 "-shaped coil forms two cross spiders, two cross spiders are respectively positioned on magnet and contacted with shell after metal
The lower section in face.
Preferably, the coil is helical winding, is wound in the shape of a spiral on magnet.
Preferably, it is molded and is connected or bonding connection by nanometer between shell and nonmetallic rear shell after the metal.
In addition, present invention also offers a kind of ultrawide band high performance multi-resonant NFC antenna system based on shell after metal, bag
Include the rear shell that shell and nonmetallic rear shell are formed by connecting after metal, it is characterised in that shell madial wall is provided with one after the metal
NFC chip and a NFC antenna, the NFC antenna are made up of magnet and the coil being wound on the magnet, and the coil is logical
A match circuit is crossed to be connected with the NFC chip；A resonant member is provided with the nonmetallic rear shell, the resonant member one end and institute
State shell after metal to connect, the other end is connected by one first regulation electric capacity with shell after the metal；The nonmetallic rear shell is upper
Multiple second regulation electric capacity are provided between shell after resonant member and metal, and one end of every one second regulation electric capacity passes through
One first microstrip transmission line is connected to resonant member, and the other end is connected to shell after metal by one second microstrip transmission line；Wherein, institute
State NFC chip makes NFC antenna resonance in the first resonant frequency by match circuit, and NFC antenna excites sensing after metal on shell
Shell transmits a signal to receiving device near field form together with NFC antenna and interacted after electric current, the metal, while golden
Electric current after category on shell returns to shell after metal after resonant member is respectively through the first regulation electric capacity and every one second regulation electric capacity,
Resonant member resonance is made in the second resonant frequency by the first regulation electric capacity, and makes every one first by every one second regulation electric capacity
Microstrip transmission line resonance corresponding with every one second microstrip transmission line is in corresponding resonant frequency.
In addition, present invention also offers a kind of resonance NFC antenna system of ultrawide band high performance three based on shell after metal, bag
Include shell madial wall after the rear shell that shell and nonmetallic rear shell are formed by connecting after metal, the metal and be provided with a NFC chip and one
NFC antenna, the NFC antenna is made up of magnet and the coil being wound on the magnet, and the coil passes through a matching electricity
Road is connected with the NFC chip；A resonant member is provided with the nonmetallic rear shell, the resonant member one end and shell after the metal
Connection, the other end is connected by one first regulation electric capacity with shell after the metal, and centre passes sequentially through the first microstrip transmission line, the
Two regulation electric capacity, the second microstrip transmission line are connected with shell after the metal；Wherein, the NFC chip makes NFC by match circuit
Antenna resonance is in the first resonant frequency, and NFC antenna excites shell and NFC antenna after induced-current, the metal after metal on shell
Receiving device is transmitted a signal near field form together and interacted, while the electric current after metal on shell is by resonant member point
Shell after metal is not returned to after the second regulation electric capacity and the first regulation electric capacity, resonant member resonance is existed by the first regulation electric capacity
Second resonant frequency, makes the first microstrip transmission line and the second microstrip transmission line resonance in the 3rd resonance by the second regulation electric capacity,
Now the 3rd resonance, the second resonance are superimposed with the first resonance.
NFC chip of the present invention makes NFC antenna resonance in the first resonant frequency by match circuit, and NFC antenna exists simultaneously
Shell after induced-current, one side metal is excited to transmit a signal to reception together with NFC antenna near field form after metal on shell
Equipment is simultaneously interacted；On the other hand, the electric current after metal on shell is returned to after metal after resonant member and the first regulation electric capacity
On shell and constitute a current loop, by first regulation electric capacity can make the current loop resonance in the second resonant frequency so that
The second resonance is realized to be superimposed with the first resonance.Compared with prior art, the present invention is not only simple in construction, it is easy to accomplish；And
Covering bandwidth, the magnetic field intensity and operating distance for improving working frequency section, so as to drastically increase based on shell after metal
The NFC performances of material electronic equipment, bring to user and more preferably experience.
Brief description of the drawings
Fig. 1 is the structural representation of first embodiment of the invention NFC antenna system；
Fig. 2 is the CURRENT DISTRIBUTION schematic diagram under the first resonant frequency of the invention；
Fig. 3 is the magnetic field distribution schematic diagram under the first resonant frequency of the invention；
Fig. 4 is the CURRENT DISTRIBUTION schematic diagram under the second resonant frequency of the invention；
Fig. 5 is the magnetic field distribution schematic diagram under the second resonant frequency of the invention；
Fig. 6 is single resonance of the present invention and double resonance NFC antenna impedance real part and frequency relation curve contrast schematic diagram；
Fig. 7 is " Z " font NFC antenna structural representation of the invention；
Fig. 8 is " Z " font NFC antenna of the invention and shell placing direction schematic diagram one after metal；
Fig. 9 is " Z " font NFC antenna of the invention and shell placing direction schematic diagram two after metal；
Figure 10 is figure of eight NFC antenna structural representation of the present invention；
Figure 11 is figure of eight NFC antenna of the present invention and shell placing direction schematic diagram after metal；
Figure 12 is the spiral NFC antenna structural representation of the present invention；
Figure 13 is the spiral NFC antenna of the present invention and shell placing direction schematic diagram after metal；
Figure 14 is the structural representation of second embodiment of the invention NFC antenna system；
Figure 15 is the structural representation of third embodiment of the invention NFC antenna system；
Figure 16 is the structural representation of fourth embodiment of the invention NFC antenna system；
Figure 17 is Smith experimental result pictures of the present invention；
Figure 18 is three resonance producing method structure chart of the invention；
Figure 19 is single resonance of the present invention and three resonance NFC antenna impedance real parts and frequency relation curve contrast schematic diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention is to provide covering bandwidth, the magnetic field intensity of working frequency section is strong and operating distance is high based on gold
The ultrawide band high performance NFC antenna system of shell after category, the antenna system has simple in construction, realization easy, can greatly carry
After high metal the advantages of the NFC performances of shell material matter electronic equipment.
Embodiment one
Refer to shown in Fig. 1, Fig. 1 is the structural representation of first embodiment of the invention NFC antenna system.The present embodiment institute
In the NFC antenna system stated, reference axis+X is represented along the long side of mobile phone and is pointed to earpiece side, and-X is represented along the long side of mobile phone and pointed to hand
Machine key-side ,+Z is represented along mobile phone and is pointed to screen orientation, and-Z is represented along mobile phone and pointed to mobile phone battery cover direction.
Wherein the antenna system includes rear shell, and the rear shell includes shell 200 and nonmetallic two parts of rear shell 202 after metal, its
In the nonmetallic rear material of shell 202 be usually plastics, glass, resin, foam etc. or its composition composite, shell 200 after metal
It is general using nanometer Shooting Technique (or directly being bonded using glue) connection between nonmetallic rear shell 202.
The medial surface of shell 200 is provided with a NFC chip 1 and a NFC antenna 3 after metal, NFC chip 1 with NFC days
Line 3 is connected.
NFC chip 1 can be using grace intelligence Pu, Samsung, Botong, Lian Fake, STMicw Electronics, Fudan University's microelectronics, female sharp etc. half
The chip that conductor manufacturer provides, and illustrated in the present embodiment by taking grace intelligence Pu PN548 as an example.
NFC antenna 3 is made up of magnet and the coil being wound on the magnet, and the coil by a match circuit with
The NFC chip 1 is connected.Wherein magnet is made by including but is not limited to the magnetic material such as ferrite, nanocrystalline, amorphous, silicon steel.
NFC chip 1, match circuit and NFC antenna 3 coil formation the first resonant current loop, NFC chip 1 by
With circuit the coil of NFC antenna 3 can be made to produce the first resonance (the first resonant frequency is 13.5MHz or so in the present embodiment).
It is an annular metal 201 that resonant member in a resonant member, the present embodiment is provided with nonmetallic rear shell 202, should
Annular metal 201 is identical with the material of shell after metal 200, and its one end is directly connected with shell after metal 200, and other end passes through one
Individual first regulation electric capacity 2 is connected with shell after metal 200.Shell 200, the regulation corresponding shape of electric capacity 2 of annular metal 201, first after metal
Into the second resonant current loop, adjusting electric capacity 2 by regulation first can make annular metal 201 produce the second resonance (this implementation
The second resonant frequency is 15MHz or so in example), and second resonance is superimposed with the first resonance.
Antenna system operation principle described in the present embodiment is：Electric signal is sent from the transmitting terminal of mobile phone NFC chip 1, is adjusted
The periphery match circuit of section mobile phone NFC chip 1 can make the resonance of NFC antenna 3 in first resonance 13.5MHz or so, and NFC antenna 3
Induced-current is excited on shell 200 after metal, now, the one side of shell 200 and NFC antenna 3 together will near field form after metal
Signal " transmission " is to receiving device and interacts, and electric current is flowed on annular metal 201 on another aspect metal rear shell portion 200
Returned to after the first regulation electric capacity 2 after metal on shell 200, the resonance of annular metal 201 is made second by the first regulation electric capacity 2
Resonance 15MHz or so, now the second resonance is superimposed with the first resonance, so as to cover more broadband, enhances working frequency section
Magnetic field intensity and the operating distance for improving NFC.
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 the CURRENT DISTRIBUTION schematic diagram under the first resonant frequency of the invention；Fig. 3 is the present invention
Magnetic field distribution schematic diagram under first resonant frequency；Fig. 4 is the CURRENT DISTRIBUTION schematic diagram under the second resonant frequency of the invention；
Fig. 5 is the magnetic field distribution schematic diagram under the second resonant frequency of the invention.
Contrasted from Fig. 2 and Fig. 4, electric current is more than in Fig. 2 electric current on annular metal 201 on annular metal 201 in Fig. 4.
As described above, because the second resonance 15MHz is produced by the electric capacity 2 of annular metal 201 and first, so ring under the second resonant frequency
Electric current is better than the electric current on annular metal 201 under the first resonant frequency on shape metal 201.
Nearby magnetic field intensity is more than in Fig. 5 the magnetic field nearby of annular metal 201 to annular metal 201 in comparison diagram 3 and Fig. 5, Fig. 3
Intensity, reason ibid, because the second resonance 15MHz is produced by the electric capacity 2 of annular metal 201 and first, thus the second resonance frequency
Magnetic field intensity under rate near annular metal 201 is better than the magnetic field intensity near annular metal 201 under the first resonant frequency.
Fig. 6 is single resonance of the present invention and double resonance NFC antenna impedance real part and frequency relation curve contrast schematic diagram.Wherein
Solid line is single resonance NFC antenna impedance real part and frequency curve chart (single resonance is the resonance of only double resonance first), and dotted line is double
Resonance NFC antenna impedance real part and frequency curve chart, dotted line compare solid line, and it has more Frequency points close to 30 Ω, i.e., double humorous
Shake under state, band bandwidth is widened.(PN548 mobile phones NFC chip requirement in grace intelligence Pu need to adjust antenna impedance in working frequency point
30+j0 Ω are saved, reaches and matches with NFC chip 1, reflection, energy maximum transmitted is reduced).
It should be noted that NFC antenna 3 is made up of magnet and the coil being wound on the magnet in the present embodiment, and
Then there is multiple choices mode for coil, done further using different coils below in conjunction with 7~13 pairs of the present embodiment of accompanying drawing
Explanation.
As shown in Fig. 7~Fig. 9, Fig. 7 is " Z " font NFC antenna structural representation of the invention；Fig. 8 is " Z " font of the invention
NFC antenna and shell placing direction schematic diagram one after metal；Fig. 9 is " Z " font NFC antenna of the invention and shell placing direction after metal
Schematic diagram two.
" Z " the font coil 61 on magnet 62 is constituted NFC antenna by magnet 62 and around the home in the present embodiment, wherein " Z "
Font coil 61 and the magnet 62 in " Z " the font coil 61 are entirely located in the outer side edges inframe of shell 200 after metal.
Wherein the shell 200 after metal of " Z " font coil 61 is connected the one end at edge with nonmetallic rear shell 202 positioned at magnet
62 top (top in shell noncontact face after magnet and metal, that is, magnet face is towards the one side of mobile phone display screen), it is remote
Shell 200 is connected lower section (magnet and metal after shell contact surface of the one end at edge positioned at magnet 62 with nonmetallic rear shell 202 after metal
Lower section, that is, magnet face is towards the one side of mobile phone battery cover), both sides close to shell 200 after metal with nonmetallic rear shell 202 by connecting
One end of edge fit edge is extended downwardly to the one end for being connected edge with nonmetallic rear shell 202 away from shell 200 after metal in " Z " font
(see Fig. 8).
In addition, " Z " font coil 61 in Fig. 8 is rotated 180 ° by correspondence around X-axis, then it is another situation, such as Fig. 9 institutes
Show, one end that edge is connected with nonmetallic rear shell 202 now close to shell after metal 200 can also be located at the lower section of magnet 62, and
One end that edge is connected with nonmetallic rear shell 202 away from shell 200 after metal is located at the top of magnet 62, and both sides are by after metal
Shell 200 is connected the one end at edge with nonmetallic rear shell 202 and is connected edge with nonmetallic rear shell 202 to away from shell 200 after metal
One end is upwardly extended in " Z " font.
Although Fig. 8 and Fig. 9 can reach the effect of double resonance superposition, from the two actual putting for coil
Direction is different, and the performance of antenna has certain difference, only using the disposing way shown in Fig. 8, i.e., " Z " font coil 61 is put
Put in the top (along +Z direction) of magnet 62, the NFC antenna coil 61 away from the edge of shell 200 after metal is in the lower section of magnet 62
When, performance can be only achieved most preferably.
As shown in Figure 10, Figure 10 is figure of eight NFC antenna structural representation of the present invention, and such as (application is public for Chinese invention patent
Cloth CN 105024169A) refer to, figure of eight NFC antenna is designed compared to other, has more best performance, so can be preferably
Applied in each mobile electronic device.
Figure 11 is figure of eight NFC antenna of the present invention and shell placing direction schematic diagram after metal.NFC antenna in the present embodiment
The " 8 "-shaped coil 71 on magnet 72 is constituted by magnet 72 and around the home, wherein " 8 "-shaped coil 71 and positioned at the figure of eight
Magnet 72 in coil 71 is entirely located in the outer side edges inframe of shell 200 after metal.
Magnet 72 be located at " 8 "-shaped coil 71 in, and the " 8 "-shaped coil 71 close and far from shell after metal with it is nonmetallic
The one end at shell connection edge is respectively positioned on the top of magnet 72 (magnet and the top in shell noncontact face after metal, that is, magnet afterwards
Facing to the one side of mobile phone display screen), two cross spiders that centre is correspondingly formed are located at center section (magnet below magnet 72
See Figure 10, Figure 11 towards the one side of mobile phone battery cover with the lower section of shell contact surface after metal, that is, magnet face).
Certainly, alternatively mode, can rotate 180 ° by antenna correspondence in Figure 11 around X-axis, can also produce pair humorous
Shake Overlay, although now magnet 72 also is located in " 8 "-shaped coil 71, " 8 "-shaped coil is close and far from shell after metal
The one end for being connected edge with nonmetallic rear shell is then all located at the lower section of magnet 72, and " 8 "-shaped coil in the middle of formed two
Cross spider, correspondence is located at the upper middle portion of magnet 72.But this disposing way, effect is unsatisfactory, only Figure 10 and figure
One end that 11 this disposing way, i.e. the " 8 "-shaped coil shell after metal are connected edge with nonmetallic rear shell is located at magnet
When 72 top, antenna performance can be only achieved most preferably, and antenna correspondence rotates the disposing way after 180 ° around X-axis, effect
Disposing way not as good as Figure 10 and 11.
As shown in Figure 12~Figure 13, Figure 12 is the spiral NFC antenna structural representation of the present invention；Figure 13 is spiral of the present invention
Formula NFC antenna and shell placing direction schematic diagram after metal.NFC antenna is by magnet 82 and around the home on magnet 82 in the present embodiment
Helical winding 81 is constituted, and wherein helical winding 81 and the magnet 82 in the helical winding 81 is entirely located in after metal
The outer side edges inframe of shell 200.
Coil is helical winding 81, is wound in the shape of a spiral on magnet 82, and its correspondence side view is as shown in Figure 13.Especially
Ground, as described in Chinese invention patent (application publication number CN 106374209A), when being wound on 82 groups of magnet by helical winding 81
Into NFC antenna be small size (6mm*3mm*1mm or so) when, it can also be used in this case as NFC antenna and realize this case
Effect.
It can reach that the present embodiment can be produced using " Z " font coil, " 8 "-shaped coil and helical winding above
The optimum efficiency of raw double resonance superposition, but actually can also using other any coils (coil can after metal shell region
Excite the electric current favourable to antenna) include but is not limited to spiral, zigzag, " 8 " fonts, O fonts, rectangle and irregular coiling
Mode coil etc.；And the magnet used in the present embodiment also includes but is not limited to ferrite, nanocrystalline, amorphous, silicon steel etc., pass through
The appropriate stacking of coil and magnet and arrangement, the NFC antenna constituted can reach the similar effect of the present embodiment.
Embodiment two
As shown in figure 14, Figure 14 is the structural representation of second embodiment of the invention NFC antenna system.
The present embodiment is compared with embodiment one, and difference is, the resonant member of the upper setting of nonmetallic rear shell 202 is lamellar gold
Belong to part 203, described one end of sheet metal part 203 is connected by a bonding jumper 204 with shell 200 after the metal, and the other end passes through
One first regulation electric capacity 2 is connected with shell 200 after the metal；And shell 200, bonding jumper 204, sheet metal part 203, after metal
One regulation the second resonant current loop of formation of electric capacity 2, adjusting electric capacity 2 by regulation first can make sheet metal part 203 produce the
Two resonance.
Antenna system operation principle described in the present embodiment is：Electric signal is sent from the transmitting terminal of mobile phone NFC chip 1, is adjusted
The periphery match circuit of section mobile phone NFC chip 1 can make the resonance of NFC antenna 3 in first resonance 13.5MHz or so, and NFC antenna 3
Induced-current is excited on shell 200 after metal, now, the one side of shell 200 and NFC antenna 3 together will near field form after metal
Signal " transmission " is to receiving device and interacts, and electric current flows to sheet by bonding jumper 204 on shell 200 after another aspect metal
On metalwork 203, then returned to after the first regulation electric capacity 2 after metal on shell 200, sheet is made by the first regulation electric capacity 2
The resonance of metalwork 203 is in second resonance 15MHz or so, and now the second resonance is superimposed with the first resonance, so as to cover more wideband
Band, enhances working frequency section magnetic field intensity and improves NFC operating distance.
Below with reference to following table to implement one and the present embodiment two in single resonance (only the resonance of double resonance first) and pair humorous
Four card response distances under shaking carry out comparative illustration.
Double resonance and the single resonance under the corresponding Fig. 1 structures of embodiment one are can be seen that from above-mentioned Card Reader distance versus table
Compare, the response distance of four cards lifts 47.7%, 25.2%, 59.2%, 131.7% respectively.
Double resonance under the corresponding Figure 14 structures of embodiment two is compared with single resonance, and the response distance of four cards is lifted respectively
112.9%th, 56%, 86.7%, 247.1%
It follows that being superimposed the double resonance produced by the first resonance and the second resonance, NFC antenna can be greatly improved
Card Reader distance, substantially increases the NFC performances of shell material matter electronic equipment after metal.
Building form and other structures and corresponding operation principle and this implementation as the NFC antenna in embodiment one
Example is essentially identical, will not be described here.
Embodiment three
As shown in figure 15, Figure 15 is the structural representation of third embodiment of the invention NFC antenna system.
The present embodiment is compared with embodiment one, and difference is, one is that the nonmetallic area of rear shell 202 greatly reduces；Two right and wrong
The resonant member set after metal on shell 202 is annular metal 201, and its one end passes through a bonding jumper 204 and shell 200 after the metal
Connection, the other end is connected by one first regulation electric capacity 2 with shell 200 after the metal；And shell 200 after metal, bonding jumper 204,
Regulation the second resonant current loop of formation of electric capacity 2 of annular metal 201, first, ring-type gold can be made by adjusting electric capacity 2 by regulation first
Category 201 produces the second resonance.
Antenna system operation principle described in the present embodiment is：Electric signal is sent from the transmitting terminal of mobile phone NFC chip 1, is adjusted
The periphery match circuit of section mobile phone NFC chip 1 can make the resonance of NFC antenna 3 in first resonance 13.5MHz or so, and NFC antenna 3
Induced-current is excited on shell 200 after metal, now, the one side of shell 200 and NFC antenna 3 together will near field form after metal
Signal " transmission " is to receiving device and interacts, and electric current flows to ring-type by bonding jumper 204 on shell 200 after another aspect metal
On metal 201, then returned to after the first regulation electric capacity 2 after metal on shell 200, ring-type gold is made by the first regulation electric capacity 2
Belong to 201 resonance in second resonance 15MHz or so, now the second resonance is superimposed with the first resonance, so as to cover more broadband, increase
Strong working frequency section magnetic field intensity and the operating distance for improving NFC.
Building form and other structures and corresponding operation principle and this implementation as the NFC antenna in embodiment one
Example is essentially identical, will not be described here.
Example IV
As shown in Figure 16,17, Figure 16 is the structural representation of fourth embodiment of the invention NFC antenna system；Figure 17 is this
Invent Smith experimental result pictures.
The present embodiment is compared with embodiment one, and difference is, resonant member is an annular metal in embodiment one, and this reality
The separated of cyclic metal piece 201 and 201 ' and strip metal part 205 in example is applied, is filled by nonmetallic rear shell portion, so this
Strip metal part 205 is resonant member in case study on implementation.Described one end of strip metal part 205 passes through the first bonding jumper 204 and gold
Shell 200 is connected after category, and the other end then passes sequentially through the second bonding jumper 204 ', the first regulation electric capacity 2 and connected with shell 200 after the metal
Connect, and shell 200, the first bonding jumper 204, strip metal part 205, the second bonding jumper 204 ', the first regulation electric capacity 2 are formed after metal
Second resonant current loop, adjusting electric capacity 2 by regulation first can make strip metal part 205 produce the second resonance.
The first resonance produces the resonance of NFC antenna 3 by the periphery match circuit of regulation mobile phone NFC chip 1 in this structure, gold
The structure of shell 200 after shell 200, the first bonding jumper 204, strip metal part 205, the second bonding jumper 204 ', the first electric capacity 2, metal after category
Into the second resonant current loop, strip metal 205 is set to produce the second resonance by adjusting the first electric capacity 2.
Need should be particularly mentioned that, NFC antenna 3 can be totally placed in after metal on shell 200 or nonmetallic rear shell portion
On 202, can also a part be placed on metal rear shell portion 200, a part is placed on nonmetallic rear shell portion 202, but right
In same metal structure, the NFC antenna performance of such as Figure 16 modes of emplacements is better than Fig. 1, Figure 14 and Figure 15 modes of emplacement.
It is the explanation to double resonance ultrawide band high performance NFC antenna system of the present invention above, and institute actually of the present invention
The scheme and structure stated are also applied for three resonance and multi-resonant NFC antenna system, below in conjunction with Figure 18 and 19 pair of three resonance
NFC antenna system is illustrated.
As shown in Figure 18,19, Figure 18 is three resonance producing method structure chart of the invention；Figure 19 is single resonance of the present invention and three
Resonance NFC antenna impedance real part and frequency relation curve contrast schematic diagram.
Compared to double resonance NFC antenna system (Fig. 1 structures), three resonance NFC antenna system general principle phases of the invention
Together, difference part is, shell behind a resonant member 201, one end of the resonant member 201 and metal is provided with nonmetallic rear shell 202
200 connection, the other end by one first regulation electric capacity 2 be connected with shell after metal 200, it is middle then pass sequentially through the first micro-strip transmit
Line 103 ', the second regulation electric capacity 2 ', the second microstrip transmission line 103 are connected with shell 200 after the metal；Wherein, the NFC chip
1 makes the resonance of NFC antenna 3 in the first resonant frequency by match circuit, and NFC antenna 3 excites induced-current after metal on shell, institute
State shell 200 after metal to transmit a signal to receiving device near field form together with NFC antenna 3 and interact, while metal
The electric current on shell 200 is returned to after metal after resonant member 201 is respectively through the second regulation electric capacity 2 ' and the first regulation electric capacity 2 afterwards
Shell, makes the resonance of resonant member 201 in the second resonant frequency by the first regulation electric capacity 2, and then makes the by the second regulation electric capacity 2 '
One microstrip transmission line 103 ' and the resonance of the second microstrip transmission line 103 are in the 3rd resonance, now the 3rd resonance, the second resonance and first
Resonance is superimposed.
Building form and other structures and corresponding operation principle and this implementation as the NFC antenna in embodiment one
Example is essentially identical, will not be described here.
It is last it should be noted that interior of mobile phone pcb board is generally positioned at such as the +Z direction of Fig. 1 metals rear shell portion 200,
When adding pcb board, based on this case principle or improvements introduced, the similar effect of this case is equally reached.
In addition, it is necessary to, it is emphasized that above-described embodiment is only the explanation to double resonance and three resonance NFC antenna systems, from
It is all based on gold in above-described embodiment it is clear that, on the basis of the application double resonance or three resonance principle of stackings
The multi-resonant ultrawide band high performance NFC antenna of shell is belonged within the scope of the present invention after category, and it should not be construed as to this hair
Bright limitation.
In summary, NFC chip of the present invention makes NFC antenna resonance in the first resonant frequency by match circuit, and simultaneously
NFC antenna excites shell after induced-current, one side metal to pass signal near field form together with NFC antenna after metal on shell
It is defeated by receiving device and interacts；On the other hand, the electric current after metal on shell can by resonant member, first regulation electric capacity or
Returned to after other regulation electric capacity of person after metal on shell, so that correspondence produces the second resonant frequency or other resonant frequencies, so that real
The superposition of multi resonant vibration frequency is showed.Compared to prior art, the present invention is simple in construction, it is easy to accomplish；More wideband can not only be covered
Band, but also working frequency section magnetic field intensity can be improved, farther operating distance is realized, it is drastically increased based on metal
The NFC performances of shell material matter electronic equipment, bring to user and more preferably experience afterwards.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of ultrawide band high performance NFC antenna system based on shell after metal, including shell and nonmetallic rear shell connect after metal
The rear shell connect, it is characterised in that shell madial wall is provided with a NFC chip and a NFC antenna, the NFC after the metal
Antenna is made up of magnet and the coil being wound on the magnet, and the coil passes through a match circuit and the NFC chip
Connection；A resonant member is provided with the nonmetallic rear shell, the resonant member one end is connected with shell after the metal, and the other end passes through
One first regulation electric capacity is connected with shell after the metal；Wherein, the NFC chip, match circuit, NFC antenna formation first are humorous
Shake current loop, NFC antenna is produced the first resonance by adjusting match circuit；Shell, resonant member, the first regulation after the metal
Electric capacity the second resonant current loop of formation, adjusting electric capacity by regulation first makes resonant member produce the second resonance, and described second
Resonance is superimposed with the first resonance.
2. the ultrawide band high performance NFC antenna system as claimed in claim 1 based on shell after metal, it is characterised in that described
Resonant member is cyclic metal piece or sheet metal part or strip metal part, and described resonant member one end directly connects with shell after the metal
Connect, the other end is connected by one first regulation electric capacity with shell after the metal；And shell, resonant member, first adjust electric capacity after metal
The second resonant current loop is formed, adjusting electric capacity by regulation first makes resonant member produce the second resonance.
3. the ultrawide band high performance NFC antenna system as claimed in claim 1 based on shell after metal, it is characterised in that described
Resonant member is cyclic metal piece or sheet metal part or strip metal part, and described resonant member one end passes through a bonding jumper and the gold
Shell is connected after category, and the other end is connected by one first regulation electric capacity with shell after the metal；And shell, bonding jumper, resonance after metal
Part, first regulation electric capacity the second resonant current loop of formation, adjusting electric capacity by regulation first makes resonant member produce the second resonance.
4. the ultrawide band high performance NFC antenna system as claimed in claim 1 based on shell after metal, it is characterised in that described
Resonant member is included positioned at both sides and respectively with shell two ends are connected after metal cyclic metal piece and between two cyclic metal pieces
Strip metal part, a gap, the strip metal are each formed between the strip metal part and the cyclic metal piece of both sides
Part one end is connected by the first bonding jumper with shell after metal, and the other end passes sequentially through the second bonding jumper, the first regulation electric capacity and institute
Shell is stated after metal to connect, and shell after metal, the first bonding jumper, strip metal part, the second bonding jumper, the first regulation electric capacity formation the
Two resonant current loops, adjusting electric capacity by regulation first makes strip metal part produce the second resonance.
5. the ultrawide band high performance NFC antenna system based on shell after metal as described in claim 2~4 is any, its feature exists
In the coil is " Z " font coil, and the magnet, which is located at, to be somebody's turn to do in " Z " font coil, and is somebody's turn to do " Z " font coil close to metal
Shell is connected top of the one end at edge positioned at shell noncontact face after magnet and metal with nonmetallic rear shell afterwards, away from shell after metal with
The one end at nonmetallic rear shell connection edge is located at the lower section of magnet and shell contact surface after metal, both sides by close to shell after metal with it is non-
The one end at shell connection edge is downward in " Z " font to the one end for being connected edge with nonmetallic rear shell away from shell after metal after metal
Extension.
6. the ultrawide band high performance NFC antenna system based on shell after metal as described in claim 2~4 is any, its feature exists
Be " 8 "-shaped coil in, the coil, the magnet is located in " 8 "-shaped coil, and the " 8 "-shaped coil close and far from
Shell is connected the top that the one end at edge is respectively positioned on shell noncontact face after magnet and metal with nonmetallic rear shell after metal, and " 8 " word
Two cross spiders are formed in the middle of shape coil, two cross spiders are respectively positioned on the lower section of magnet and shell contact surface after metal.
7. the ultrawide band high performance NFC antenna system based on shell after metal as described in claim 2~4 is any, its feature exists
In the coil is helical winding, is wound in the shape of a spiral on magnet.
8. the ultrawide band high performance NFC antenna system as claimed in claim 1 based on shell after metal, it is characterised in that described
It is molded and is connected or bonding connection by nanometer between shell and nonmetallic rear shell after metal.
9. a kind of ultrawide band high performance NFC antenna system based on shell after metal, including shell and nonmetallic rear shell connect after metal
The rear shell connect, it is characterised in that shell madial wall is provided with a NFC chip and a NFC antenna, the NFC after the metal
Antenna is made up of magnet and the coil being wound on the magnet, and the coil passes through a match circuit and the NFC chip
Connection；A resonant member is provided with the nonmetallic rear shell, the resonant member one end is connected with shell after the metal, and the other end passes through
One first regulation electric capacity is connected with shell after the metal；It is located on the nonmetallic rear shell after resonant member and metal and is set between shell
There are multiple second regulation electric capacity, and one end of every one second regulation electric capacity is connected to resonance by one first microstrip transmission line
Part, the other end is connected to shell after metal by one second microstrip transmission line；Wherein, the NFC chip makes NFC by match circuit
Antenna resonance is in the first resonant frequency, and NFC antenna excites shell and NFC antenna after induced-current, the metal after metal on shell
Receiving device is transmitted a signal near field form together and interacted, while the electric current after metal on shell is by resonant member point
Shell after metal is not returned to after the first regulation electric capacity and every one second regulation electric capacity, makes resonant member humorous by the first regulation electric capacity
Shake in the second resonant frequency, and every one first microstrip transmission line and every one second micro-strip are passed by every one second regulation electric capacity
Defeated line correspondence resonance is in corresponding resonant frequency.
10. a kind of ultrawide band high performance NFC antenna system based on shell after metal, including shell and nonmetallic rear shell connect after metal
The rear shell connect, it is characterised in that shell madial wall is provided with a NFC chip and a NFC antenna, the NFC after the metal
Antenna is made up of magnet and the coil being wound on the magnet, and the coil passes through a match circuit and the NFC chip
Connection；A resonant member is provided with the nonmetallic rear shell, the resonant member one end is connected with shell after the metal, and the other end passes through
One first regulation electric capacity is connected with shell after the metal, and centre passes sequentially through the first microstrip transmission line, the second regulation electric capacity, second
Microstrip transmission line is connected with shell after the metal；Wherein, the NFC chip makes NFC antenna resonance first by match circuit
Resonant frequency, NFC antenna excites after induced-current, the metal shell together with NFC antenna near field form after metal on shell
Transmit a signal to receiving device and interact, while the electric current after metal on shell is adjusted by resonant member respectively through second
Shell after metal is returned to after electric capacity and the first regulation electric capacity, resonant member resonance is made in the second resonant frequency by the first regulation electric capacity,
First microstrip transmission line and the second microstrip transmission line resonance are made in the 3rd resonance by the second regulation electric capacity, now the 3rd resonance,
Second resonance is superimposed with the first resonance.
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| CN201710244517.9A CN106972237B (en) | 2017-04-14 | 2017-04-14 | Ultra-wideband high-performance NFC antenna system based on metal backshell |
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| CN201710244517.9A CN106972237B (en) | 2017-04-14 | 2017-04-14 | Ultra-wideband high-performance NFC antenna system based on metal backshell |
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| CN106972237B CN106972237B (en) | 2023-10-13 |
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