A kind of near-field communication and wireless charging integral antenna based on metal rear shellTechnical field:
The present invention relates to antenna technical fields, and in particular to a kind of mobile terminals such as mobile phone for metal rear shellNear-field communication and wireless charging integral antenna.
Background technique:
Antenna is a kind of device received using frequency characteristic and emit signal.In recent years, with wireless terminal and communicationThe development of technology, wireless near field communication (Near Field Communication, NFC, working frequency 13.56MHz) and nothingLine charge power technology (for example, the Qi standard of wireless charging alliance (WPC), working frequency 100-200MHz), it is mobile in mobile phone etc.It is widely used in terminal.
NFC technique starts from RFID tag (Radio Frequency Identify Detection) technology, that is, existsInduction type card reader and icah wavw are combined on one chip, realize point-to-point data exchanging function.NFC chip is mounted in handOn the mobile terminals such as machine, the function of doit electronic payment and intelligent recognition and data transmission may be implemented.
With light, the thin designer trends of the mobile terminals such as mobile phone, the application of NFC and WPC are increasingly taken seriously.And it is currentThe design scheme that WPC antenna and NFC antenna use on mobile phone is: NFC antenna and WPC antenna being coiled into concentric circles and are placed on batteryOr above metal plate, and ferrite is added to obtain preferable antenna performance between aerial coil and battery.
But then there is biggish difficulty for the mobile device with metal rear shell in this design method.CauseIf being placed directly on the inside of metal shell for NFC antenna and WPC antenna, can not only be generated in metal rear shell complete with antenna currentReversed vortex, and metal rear shell can also shield completely antenna, therefore can make aerial signal can not be in metal rear shellOutside is detected.
To solve the above problems, United States Patent (USP) US20150130979A1 propose a kind of NFC with metal rear shell andThe integral antenna design scheme of WPC, by opening diameter very big (diameter about 35mm or so) in metal rear shellNFC and WPC aerial coil is included in this through-hole by through-hole.But this design method be provided in metal rear shell asThis big through-hole will weaken the practicability of the design scheme significantly.
Summary of the invention:
For this purpose, the purpose of the present invention is to provide it is a kind of it is simple and practical, be applicable to the NFC with metal rear shell mobile deviceWith WPC integral antenna.
To achieve the above object, the present invention mainly adopts the following technical scheme that
The present invention provides a kind of near-field communication based on metal rear shell and wireless charging integral antennas, including are mounted onThe NFC antenna coil and WPC aerial coil of mobile terminal metal rear shell inner sidewall, there are two logical for setting in the metal rear shellHole, the NFC antenna coil are compassingly set at the outside of a through-hole, and it is logical that the WPC aerial coil is compassingly set at anotherThe outside in hole is connected by the first gap being opened in metal rear shell between described two through-holes, and on the side of metal rear shellEdge offers second gap for connecting any one through-hole.
Further, the through-hole is rectangle, round or ellipse, and the NFC antenna coil and WPC aerial coil withThe shape of through-hole corresponds to identical.
The present invention also provides a kind of near-field communication based on metal rear shell and wireless charging integral antennas, including installationThere are two logical for setting on the NFC antenna coil and WPC aerial coil of mobile terminal metal rear shell inner sidewall, the metal rear shellHole, the NFC antenna coil are compassingly set at the outside of any one through-hole, and the WPC aerial coil is compassingly set at NFC daysThe outside of line coil is connected by the first gap being opened in metal rear shell between described two through-holes, and in metal rear shellEdge have the second gap of an any through-hole of connection.
The present invention also provides a kind of near-field communication based on metal rear shell and wireless charging integral antennas, including installationThere are two logical for setting on the NFC antenna coil and WPC aerial coil of mobile terminal metal rear shell inner sidewall, the metal rear shellHole, the WPC aerial coil are compassingly set at the outside of any one through-hole, and the NFC antenna coil is compassingly set at WPC daysThe outside of line coil is connected by the first gap being opened in metal rear shell between described two through-holes, and in metal rear shellEdge have the second gap of an any through-hole of connection.
The present invention also provides a kind of near-field communication based on metal rear shell and wireless charging integral antennas, including installationOne is provided on the NFC antenna coil and WPC aerial coil of mobile terminal metal rear shell inner sidewall, the metal rear shell to lead toHole, the NFC antenna coil are compassingly set at the outside of the through-hole, and the WPC aerial coil is compassingly set at described NFC daysThe outside of line coil, and have the gap of a connection through-hole in the edge of metal rear shell.
Further, it is provided with a protrusion for exposing to metal rear shell on the WPC aerial coil, and the gap is located atIn the protrusion.
Further, the metal rear shell is made of the first metal rear shell and the second metal rear shell, and the through-hole is set toIn second metal rear shell, a protrusion being located in the first metal rear shell, and gap position are provided on the WPC aerial coilIn in the protrusion.
The present invention also provides a kind of near-field communication based on metal rear shell and wireless charging integral antennas, including installationOne is provided on the NFC antenna coil and WPC aerial coil of mobile terminal metal rear shell inner sidewall, the metal rear shell to lead toHole, the WPC aerial coil are compassingly set at the outside of the through-hole, and the NFC antenna coil is compassingly set at described WPC daysThe outside of line coil, and have the gap of a connection through-hole in the edge of metal rear shell.
Further, it is provided with a protrusion for exposing to metal rear shell on the NFC antenna coil, and the gap is located atIn the protrusion.
Further, the metal rear shell is made of the first metal rear shell and the second metal rear shell, and the through-hole is set toIn second metal rear shell, a protrusion being located in the first metal rear shell, and gap position are provided on the NFC antenna coilIn in the protrusion.
Compared with traditional NFC and WPC integral antenna, the present invention in metal rear shell by opening a gap, and benefitThe through-hole in metal rear shell is connected with metal rear shell edge with the gap, effectively changes the vortex point in metal rear shellCloth also enhances the performance of antenna while eliminating metal rear shell and acting on radome.Present invention institute in metal rear shellOpening hole can be used for installing camera, flash lamp or fingerprint Identification sensor etc., will not destroy the beauty of metal rear shell itself,And be set to metal rear shell inner sidewall NFC and WPC integral antenna can WPC work when effectively pass through metal rear shell intoRow heat dissipation, and then weaken the temperature overheating problem that wireless charging is electrically charged equipment in the process.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of NFC and WPC integral antenna when being provided with doubled via in metal rear shell of the present invention；
Fig. 2 is antenna current distribution when not cracking gap and the Eddy Distribution figure in metal rear shell；
The Eddy Distribution figure in antenna current distribution and metal rear shell that Fig. 3 is below the present invention when being WPC Antenna Operation；
The Distribution of Magnetic Field figure that it is WPC antenna on the outside of the metal rear shell at 5mm that Fig. 4, which is below the present invention,；
It is antenna current distribution when NFC antenna works and the Eddy Distribution figure in metal rear shell that Fig. 5, which is above the present invention,；
Fig. 6 is above the present invention Distribution of Magnetic Field figure that is NFC antenna on the outside of the metal rear shell at 25mm；
Fig. 7 is NFC and WPC concentric structure schematic diagram when being provided with doubled via in metal rear shell of the present invention；
NFC or WPC is equipped with concentric structure schematic diagram raised on the outside of metal rear shell when Fig. 8 is single-pass hole of the present invention；
Fig. 9 is the antenna current in the case of Fig. 8 and the Eddy Distribution figure in metal rear shell；
Figure 10 be Fig. 8 in the case of WPC Antenna Operation when on the outside of the metal rear shell Distribution of Magnetic Field figure at 5mm；
In the case of Figure 11 is Fig. 8 when WPC Antenna Operation on the outside of the metal rear shell Distribution of Magnetic Field figure at 25mm；
NFC or WPC is equipped with the concentric structure schematic diagram in metal rear shell internal projection when Figure 12 is single-pass hole of the present invention；
NFC and WPC concentric structure schematic diagram when Figure 13 is single-pass hole of the present invention；
NFC and WPC and the concentric structure schematic diagram containing upper metal rear shell when Figure 14 is single-pass hole of the present invention.
Identifier declaration in figure: metal rear shell 1, the first metal rear shell 101, the second metal rear shell 102, through-hole 2, through-hole 3,NFC antenna coil 4, WPC aerial coil 5, raised 501, gap 6, gap 7.
Specific embodiment:
To illustrate thought and purpose of the invention, the present invention is done further below in conjunction with the drawings and specific embodimentsExplanation.
There is the mobile terminal of metal rear shell for tradition, because when using NFC antenna and WPC antenna, after metalThe vortex being completely reversed with antenna current and metal rear shell can be generated on shell completely to be shielded antenna, and aerial signal is causedThe problem of can not being detected on the outside of metal rear shell.The present invention in metal rear shell mainly by opening a gap, and benefitThe through-hole in metal rear shell is connected with metal rear shell edge with the gap, effectively changes the vortex point in metal rear shellCloth also enhances the performance of antenna while eliminating metal rear shell and acting on radome.Especially, it is arranged in metal rear shellIn the case where two through-holes, also it is connected with gap between two through-holes.Due to the presence in gap between two through-holes so that NFC andThe detour respectively integral antenna of a through-hole of WPC aerial coil is designed to possibility.
Embodiment one
As shown in FIG. 1, FIG. 1 is the structures of NFC and WPC integral antenna when being provided with doubled via in metal rear shell of the present inventionSchematic diagram.The present embodiment includes the metal rear shell 1 of mobile terminal, and through-hole 2 and through-hole 3 are provided in metal rear shell 1, wherein leading toConnected between hole 2 and through-hole 3 by gap 6, and have a gap 7 in the edge of metal rear shell 1, the gap 7 with mostThrough-hole 3 close to metal rear shell edge connects.
The shape of through-hole 2 and through-hole 3 can be rectangle, circle, ellipse and other arbitrary shapes, in the outer of through-hole 2Side wall is provided around NFC antenna coil 4, surrounds in the outside of through-hole 3 and is provided with WPC aerial coil 5, and NFC antenna hereCoil and WPC aerial coil are corresponding identical as the shape of through-hole.
Similarly, the outside of through-hole 2 can also surround and be provided with WPC aerial coil, and corresponding in the outside of through-hole 3 at this timeAround being provided with NFC antenna coil.
It should be noted that the through-hole opened in the present embodiment, corresponding diameter is smaller, and correspondence can be used for installing camera shootingHead, flash lamp and fingerprint recognition or other sensors, the aesthetic feeling of entire metal rear shell will not be destroyed from outside.
The present embodiment offers the gap 7 for starting from 1 edge of metal rear shell, which can connect through-hole 2 and through-holeAny one in 3, and as optimal scheme: gap 7 is connect with the through-hole 3 near metal rear shell edge, through-hole 2 and logicalIt is connected between hole 3 by gap 6.Radome is made to reach not only to change Eddy Distribution but also eliminate metal rear shell simultaneouslyPurpose.Therefore, it even if NFC and WPC antenna is located in the inside of metal rear shell, can also be surveyed in the outside of metal rear shellMeasure or detect the signal of antenna.
The present embodiment is compared by will open up the case where having the gap in metal rear shell with the case where not opening up gap belowTo explanation.
As shown in Fig. 2, Fig. 2 is antenna current distribution when not cracking gap and the Eddy Distribution figure in metal rear shell.In Fig. 2Metal rear shell does not have gap, when in the NFC antenna and WPC antenna being placed on two through-holes one of work when, the antennaEddy Distribution figure on electric current and metal.It will be apparent from this figure that being generated in metal rear shell in the absence of the gapVortex it is all opposite with antenna sense of current itself.By on a metal plate without above-mentioned opened gap, metal rear shellTo antenna by shielded effect, therefore aerial signal can not be detected in the outside of metal rear shell.In other words, in this feelingsAntenna will be unable to work normally under condition.
As shown in figure 3, the antenna current distribution map that Fig. 3 is below the present invention when being WPC Antenna Operation.The metal in Fig. 3After rear shell has opened gap, when underlying WPC Antenna Operation, the electric current of WPC antenna is counter clockwise direction, can from figureTo find out that the effect in gap is the circulation of vortex opposite with aerial coil current direction when preventing or be breaking at not crack gapDirection, and then the direction for changing vortex makes the vortex become the effective vortex for having positive effect to aerial coil, metal rear shellThe shielding action of NFC and WPC antenna is also eliminated simultaneously.
In addition, the underlying through-hole of antenna of work, so the Eddy Distribution in metal rear shell is almost logical with lower sectionCentered on hole, the vortex direction of part is identical as the WPC antenna current direction of work under metal rear shell；So for WPC daysFor line, metal rear shell plays the role of enhancing WPC antenna performance.Therefore metal rear shell at this time can be regarded as WPCThe booster or amplifier of antenna,
In addition, generated vortex is in the same direction on each junior unit of metal rear shell, and vortex circuit generationMagnetic flux is identical as the flow direction that WPC antenna generates.On the contrary, if gap only exists between through-hole, in metalUpper and lower two parts of rear shell, which will generate, to be flowed to different vortex circuits (Distribution of Magnetic Field at this time will have different two in directionPeak).Because only that just there are amplification or enhancing in vortex circuit identical with antenna current direction to antenna, therefore we canTo say that 100% ground of WPC antenna structure energy of the invention utilizes the vortex circuit in metal rear shell, namely maximumlly utilize metalAmplification of the rear shell to antenna.Further more, if only from top through-hole 3 reach metal edge gap 7 exist and through-hole itBetween gap 6 be not present if, then be placed on detour lower section through-hole 2 antenna will be unable to work normally.
The Distribution of Magnetic Field figure that it is WPC antenna on the outside of the metal rear shell at 5mm that Fig. 4, which is below the present invention,.
Only one peak of the Distribution of Magnetic Field of WPC antenna as can be seen from the figure.Illustrate the antenna system with a peakOnly there is a mode；Only have a single-mode benefit be the case where magnetic field strength of the mode is than two modes moreBy force namely the antenna of single-mode has better performance.In addition, it is emphasized that the design scheme not only to be located at goldBelonging to the WPC antenna below rear shell can be detected well, guarantee good efficiency of transmission, and possess the gold of larger areaGood heat dissipation performance will be had by belonging to rear shell as the design scheme of antenna a part.And then solves WPC antenna energy biographyHeat up during defeated it is excessively high and the problem of burn out the device or module of non-refractory inside equipment.
As shown in Figure 5, Figure 6, the antenna current distribution and metal rear shell that Fig. 5 is above the present invention when being NFC antenna workOn Eddy Distribution figure.From figure 5 it can be seen that because the through-hole that the antenna to work at this time is located above, metal rear shellOn Eddy Distribution be almost centered on the through-hole of top.In addition, similar to above-mentioned WPC antenna, metal rear shell is each smallGenerated vortex is all in the same direction on unit, and the flow direction of the vortex circuit magnetic flux generated and NFC antenna generationIt is identical.Therefore we can say that NFC antenna structure 100% ground of energy of the invention is using the vortex circuit in metal rear shell, namelyMetal rear shell is maximumlly utilized to the amplification of antenna.Magnetic field shown in Fig. 6 is on the outside of metal rear shell at Z=25mmNFC antenna Distribution of Magnetic Field figure.The Distribution of Magnetic Field of NFC antenna also only one peak namely one as can be seen from the figureMode.
Embodiment two
As shown in fig. 7, Fig. 7 is NFC and WPC concentric structure schematic diagram when being provided with doubled via in metal rear shell of the present invention.There are two through-hole (through-hole 2 and through-holes 3) for setting in metal rear shell 1 in the present embodiment, and WPC aerial coil 5 is compassingly set at through-hole 2Outside, NFC antenna coil 4 is compassingly set at the outside of WPC aerial coil 5, by being opened in gold between through-hole 2 and through-hole 3The gap 6 belonged in rear shell 1 connects, and has a gap 7 in the edge of metal rear shell 1, the gap 7 with closest to metal rear shellThe through-hole 3 at edge connects.
The present embodiment on the basis of the above embodiments, only utilizes a through-hole 2, makes WPC aerial coil and NFC antenna lineCircle is to form concentric structure.Under this structure, Eddy Distribution when WPC aerial coil works in metal rear shell is almost with through-holeCentered on 2, the vortex direction of the lower part of metal rear shell 1 is identical as the WPC antenna current direction of work；So for WPCFor antenna, metal rear shell plays the role of enhancing WPC antenna performance.Therefore metal rear shell at this time can be regarded asThe booster or amplifier of WPC antenna.And when NFC antenna coil working, metal rear shell each junior unit similar to WPC antennaVortex is all in the same direction caused by upper, and the magnetic flux that the vortex circuit generates is identical as the flow direction that NFC antenna generates.Therefore NFC antenna structure 100% ground of energy is using the vortex circuit in metal rear shell, namely metal rear shell pair is maximumlly utilizedThe amplification of antenna.
Similarly, WPC aerial coil can also around being arranged in the outside of NFC antenna coil, working principle with it is above-mentionedIt is identical.
Embodiment three
As shown in figure 8, NFC or WPC is equipped with Heart-to-Heart raised on the outside of metal rear shell when Fig. 8 is single-pass hole of the present inventionStructure schematic diagram.A through-hole 3 is provided in the present embodiment in metal rear shell 1, the NFC antenna coil 4 is compassingly set at describedThe outside of through-hole 3, the WPC aerial coil 5 are compassingly set at the outside of the NFC antenna coil 4, and in metal rear shell 1Edge has the gap 7 of a connection through-hole 3.One wherein, which is provided with, on the WPC aerial coil 5 exposes to metalThe protrusion 501 of rear shell 1, and the gap 3 is located in the protrusion 501.
Wherein it should be noted that being located at the NFC antenna coil 4 of inner ring and the position of the WPC aerial coil 5 positioned at outer ringIt can be interchanged.In order to ensure antenna system can work normally (namely antenna can be detected in the outside of metal rear shell), through-hole 3Equally also it is attached with gap 7 and the edge of metal rear shell 1.
Setting protrusion 501 does not intersect with cracked gap 7 on the WPC aerial coil 5 of outer ring in the present embodiment.It usesProtrusion 501 can increase magnetic field is received or detection at effective width, and then enhancing antenna communication distance and performance.
As shown in figure 9, Fig. 9 is the antenna current in the case of Fig. 8 and the Eddy Distribution figure in metal rear shell.Metal rear shellEddy Distribution on 1 is almost centered on the through-hole 3.The WPC/ in the vortex direction and work of the lower part of metal rear shell 1NFC antenna current direction is identical；Therefore for WPC/NFC antenna system, metal rear shell, which plays, enhances the antenna systemThe effect of performance.
As shown in Figure 10,11, Figure 10 be Fig. 8 in the case of WPC Antenna Operation when on the outside of the metal rear shell 5mm locate magnetic field and divideButut；In the case of Figure 11 is Fig. 8 when WPC Antenna Operation on the outside of the metal rear shell Distribution of Magnetic Field figure at 25mm.It can be seen that adoptingThe antenna system designed with this bulge-structure, WPC and NFC antenna at work, will all there is preferable antenna performance.
Example IV
As shown in figure 12, NFC or WPC is equipped with the Heart-to-Heart in metal rear shell internal projection when Figure 12 is single-pass hole of the present inventionStructure schematic diagram.The present embodiment is the improvement structure carried out on the basis of embodiment three, by the way that metal rear shell 1 is divided into firstMetal rear shell 101 and the second metal rear shell 102, and through-hole 3 is arranged in the second metal rear shell 102, on WPC aerial coil 5It is provided with the protrusion 501 being located in the first metal rear shell 101, and the gap 7 is located in the protrusion 501.
Embodiment five
As shown in figure 13, the schematic diagram of NFC and WPC concentric structure when Figure 13 is single-pass hole of the present invention.The present embodiment beThe improvement carried out on the basis of embodiment two eliminates the through-hole implemented in two, using a through-hole.Metal rear shell 1On be provided with a through-hole 3, the WPC aerial coil 5 is compassingly set at the outside of the through-hole, and the NFC antenna coil 4 enclosesThere is the seam of a connection through-hole 3 around the outside for being set to the WPC aerial coil 5, and in the edge of metal rear shell 1Gap 7.
Embodiment six
As shown in figure 14, NFC and WPC concentric structure schematic diagram when Figure 14 is single-pass hole of the present invention.The present embodiment is in realityThe improvement structure carried out on the basis of example five is applied, by the way that metal rear shell 1 is divided into the first metal rear shell 101 and the second metal rear shell102, and through-hole 3 is arranged in the second metal rear shell 102, WPC aerial coil 5 is compassingly set at the second metal rear shell 102Outside, NFC antenna coil 4 surround the outside that WPC aerial coil 5 is arranged in.
It is emphasized that the antenna effects that doubled via is arranged in the present invention in metal rear shell are better than in metal rear shellThe effect of single through-hole is set.When the WPC of doubled via and NFC antenna coil detour two through-holes up and down respectively, due to twoExisting physical distance between through-hole, thus will lead between two antennas interfere with each other it is smaller, in the feelings of inventive embodiments oneUnder condition, interfering with each other between WPC and NFC antenna be can be ignored.
In summary, the present invention in mobile terminal metal rear shell by opening up a gap, and utilizes the gap ingeniousGround in metal rear shell through-hole and through-hole be connected with metal edge, to effectively change the vortex in metal rear shellDistribution；Therefore the present invention also enhances the performance of antenna while eliminating metal rear shell and acting on radome.With it is traditionalNFC with WPC integral antenna is compared, and the present invention only needs to open up lesser through-hole in metal rear shell, and the through-hole canFor installing the modules such as camera, flash lamp, fingerprint Identification sensor, therefore the present invention will not destroy the integrated beauty of metal rear shellSense, which ensure that having taken into account its cosmetic requirements while metal rear shell practicability.In addition, the present invention is also to a certain extentAlso solve heat dissipation problem during WPC Antenna Operation.
It is to be carried out to the near-field communication provided by the present invention based on metal rear shell and wireless charging integral antenna aboveDetailed introduction, specific case used herein is expounded structural principle and embodiment of the invention, aboveEmbodiment is merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specificationAppearance should not be construed as limiting the invention.