CN103294976A - Card reading device for radio frequency communication close-range card swiping - Google Patents
Card reading device for radio frequency communication close-range card swiping Download PDFInfo
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- CN103294976A CN103294976A CN2012100415617A CN201210041561A CN103294976A CN 103294976 A CN103294976 A CN 103294976A CN 2012100415617 A CN2012100415617 A CN 2012100415617A CN 201210041561 A CN201210041561 A CN 201210041561A CN 103294976 A CN103294976 A CN 103294976A
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Abstract
The invention relates to a card reading device for radio frequency communication close-range card swiping. The card reading device comprises a plane type antenna (301), wherein an assembly (702) of polarization directions (701) produced by different points on the antenna can conduct 360-degree covering, a effective card reading area (303) of the card reading device for the radio frequency communication close-range card swiping is the area above the plane which is covered by the antenna, a grounding face (302) is arranged below the plane type antenna, and a radio frequency chip is connected with the plane type antenna (301) through a feed point. According to the card reading device for the radio frequency communication close-range card swiping, stable receiving and sending of a radio frequency signal is directly controlled through the design of the antenna and a circuit, the disadvantage of 2.4G scatter is overcome, a good effect is achieved in both direction control and distance control, no other frequency points are needed to conduct triggering, the complexity of the system design is reduced, risks and cost are reduced, stability of the system is improved, and industrialization is better facilitated.
Description
Technical field
The present invention relates to the technology for radio frequency field, is the reader device that a kind of radio communication is closely swiped the card specifically.
Background technology
Along with mobile communication terminal, such as the application popularization of mobile phone.Also more and more cause extensive interest based on new application demands such as the stored value card of mobile communication terminal, mobile phone gate inhibition, mobile-phone payments.
Satisfy these and use, best mode is identical or close with the existing radio-frequency card use-pattern of swiping the card.This just requires mobile communication terminal can come to come swap data with consumption terminal or access controller by wireless data communications as radio-frequency card.
Realize functions such as mobile payment by mobile phone, need realize near field communication (NFC) function at mobile phone, realize that at mobile phone near field communication (NFC) function mainly contains following several modes at present, first kind of pattern is the NFC mobile phone, be integrated NFC communication module on existing mobile phone (Near Field Communication), what adopt is the low frequency induction pattern of 13.56MHz, belongs to passive type, needs the user to change mobile phone; Second kind of pattern is the low frequency induction module that installs 13.56MHz at mobile phone SIM additional, needs the repacking SIM card, and can the very big sensor circuit of band at SIM, and this pattern can't large-scale commercial applicationsization; The third pattern is the active high-frequency induction module that installs 2.4G at mobile phone additional, can effectively solve penetration problem, and this kind pattern is developed in Japan, and shortcoming is that the user needs special-purpose mobile phone, and this point is not suitable for the use habit that the user changes mobile phone; The 4th kind of active high-frequency induction module (hereinafter referred to as the RF-SIM card) that pattern is integrated 2.4G on SIM card, this kind pattern meets user's use habit very much.China Mobile has selected the 4th kind of pattern for use, and as the primary standard of mobile payment, but with regard to present commercial situation, mainly there is following shortcoming: the firstth, mobile phone is to the adaptability problem of RF-SIM card, matching problem between the secondth, RF-SIM card and the RF-SIM card card-reading devcie, show that mainly card reading speed is slow, Card Reader is apart from instability, the control Card Reader is apart from difficulty, for same reader device, the mobile phone Card Reader distance that has is very near, and the mobile phone Card Reader distance that has is far, and the 3rd is that mobile phone screen display result is slow behind the Card Reader.In a word, existing technology does not solve active high frequency reader device to the directed Card Reader of RF-SIM card and the method for accurate command range, thereby influenced existing Mobile business user's experience and commercialization process, this also is that present China Mobile promotes one of obstacle of this technology.
Produce above-mentioned reason and be because the ever-changing decision of the characteristics of active radio-frequency technique itself and mobile communication terminal.Different mobile communication terminals has very strong shield effectiveness to the smart card radio communication of inserting.When low-frequency range was worked, radio frequency can't penetrate mobile communication terminal under a lot of situations especially.Therefore, we need select VHF frequency range and uhf band and the SHF frequency range that is easy to penetrate mobile communication terminal, avoid the employed frequency range of mobile communication simultaneously, with anti-collision.
Every kind of mobile communication terminal is very big to the shield effectiveness difference of radio communication.Cause when high band is worked, the high frequency intelligent wireless is stuck under the certain situation of radio-frequency receiving-transmitting power, and some is near for effective communication distance, and some is then far.Under the extreme case, its radio frequency effective communication distance even can reach several meters.And as stored value card, application such as mobile phone gate inhibition, mobile-phone payment require the efficient communication scope can not be too far away, must limit within the specific limits.Otherwise can occur misreading card and mispronounce the card operation.
On the mobile communication terminal of those shield effectiveness differences, radio-frequency receiving-transmitting power that can be by turning down the high frequency wireless smart card is in order to reduce the radio frequency effective communication distance to a certain extent.But still when having the part mobile communication terminal to use the high frequency wireless smart card, effective communication distance exceeds the tolerable scope.Can not just remove arbitrarily to turn down the radio-frequency receiving-transmitting power of rf terminal because of the mobile communication terminal of these shield effectiveness differences.Because also there is the very strong mobile communication terminal of some shield effectivenesses simultaneously.Therefore, the distance of swiping the card of effectively controlling active radio-frequency receiving-transmitting terminal is technological difficulties always.
There are a lot of patents that correlation technique is studied.Patent 20041036263.4 has been described a kind of radio-frequency (RF) receiving/transmission device, but description or announcement (realization) do not use this device effectively to control swipe the card direction and distance, patent 20082145494.2 has been described a kind of impedance and attenuator circuit and microstrip antenna of utilizing, thereby the intensity of regulating radio-frequency receiving-transmitting realizes the distance control to the distance of swiping the card, because the deployment of practical application middle impedance circuit is limited, and the shielding intensity of different mobile phones is different, same control circuit is just different fully for different mobile phone performance results, show on the effect of swiping the card, can only realize high by statistical law for the user, in, inductive mode such as low, can not accurately control Card Reader, such as when the emissive power of RF-SIM card end is big especially, namely use the highest attenuator circuit, also can realize swiping the card at a distance, this makes troubles to user's use or even swipes the card risk.In addition, to also have more prior be accurately to control from swipe the card direction and zone to this kind method.Patent 200810067445.6 is to tabulate to realize control by the radio frequency parameter of setting up various different mobile phone correspondences, but because mobile phone is ever-changing in the actual life, the radio frequency parameter of mobile phone correspondence also is relative value, and in the actual application environment, influence of various factors such as standing wave, signal reflex makes that the radio frequency parameter tabulation is usually very unreliable, therefore this method has certain help for promoting the radio frequency result of use of swiping the card, but effect is limited.Patent 20081142624.1 is to detect magnetic signature and the Electric Field Characteristics of the RF-SIM card end-fire frequency source signal that receives by a plurality of sensing points, and then extrapolates the relative distance of RF-SIM card end and each sensing point.In order to access relative distance accurately, must detect magnetic signature and the Electric Field Characteristics of radio-frequency signal source accurately.And the mobile radio terminal field strength distribution rule of each type is all inequality, need set up the near field collection of illustrative plates one by one in order to coupling in using for it.When the angle of placing when the mobile radio terminal and orientation changed, the near field collection of illustrative plates also can change, and these variations are difficult to analyze spendable rule.It is too high to implement cost, reliability that but can't ensuring method.
It mainly is that methods such as statistical study coupling by attenuator circuit, impedance matching circuit, Electric Field Characteristics solve and swipe the card apart from control problem that these above methods are concluded, these methods can only be meanss to save the situation, fundamentally do not solve effective distribution of radiofrequency signal.Because the feature of the ever-changing and active high-frequency radio frequency technology of mobile phone, though more than enumerated many kinds of methods, the actual effect of using is unsatisfactory, and these methods all can not realize accurately control in swipe the card direction and zone.Be unfavorable for the fast development of mobile e-business.
Because the radiofrequency signal of 2.4G has natural scattering, add the ever-changing of mobile communication terminal sheathing material and structure, when the high-frequency radio frequency chip being integrated in (or in SIM) in the mobile communication terminal, make the stable transmitting-receiving of between mobile communication terminal and outside card reading module, setting up the 2.4G radiofrequency signal become a difficult point, in addition, the interference of the components and parts of card reading module own and circuit design also can produce very big influence to the radio-frequency receiving-transmitting of 2.4G.Often the change of position or shape, the distribution of antenna are put in a position of components or an earth point position or a feedback, and be most important to the distribution influence of radiofrequency signal.But because this field difficulty is very big, therefore in the mobile payment field, particularly relevant research is not also seen in the mobile payment field of 2.4G, all is to adopt the methods such as statistical study coupling of attenuator circuit, impedance matching circuit, Electric Field Characteristics to avoid this difficult point or come command range with other a frequency (such as 125K or 13.56MHz).
Summary of the invention
At the defective that exists in the prior art, the reader device that the object of the present invention is to provide a kind of radio communication closely to swipe the card, by 2.4G is done further investigation, directly control the stable transmitting-receiving of radiofrequency signal by antenna and circuit design, overcome the shortcoming of 2.4G scattering, no matter in direction control, still in distance control, can both reach good effect.The present invention does not need to do triggering with other frequencies (such as 125K or 13.56MHz etc.).Reduce complex degree of system design, reduced risk and cost, improved the stability of system, more be conducive to industrialization.
For reaching above purpose, the technical scheme that the present invention takes is:
The reader device that a kind of radio communication is closely swiped the card is characterized in that, comprising:
A planar antenna 301, the set 702 of the polarised direction 701 that different point produces on this antenna can cover 360 °, and the top, plane that this antenna covers is effective Card Reader zone 303 of the reader device that radio communication closely swipes the card,
Below planar antenna, be provided with a ground plane 302,
Radio frequency chip links to each other with planar antenna 301 by the feedback point.
On the basis of technique scheme, described planar antenna 301 is round screw thread antenna, ellipse spiral shape antenna, bifilar helix antenna or Tai Ji helical aerials.
On the basis of technique scheme, described planar antenna 301 is evenly distributed on the plane by a core assembly chip antenna and constitutes.
On the basis of technique scheme, described ground plane 302 is one deck Copper Foil.
On the basis of technique scheme, below ground plane 302, be provided with interference source.
On the basis of technique scheme, this device comprises that 401, first to fourth layers of four layers of wiring boards are stacked successively from top to bottom, and ground floor comprises antenna for transmitting and receiving circuit; The second layer is ground connection and screen layer; The 3rd layer is the connecting circuit between each layer, and the 4th layer is the interference shielding circuit,
The described second layer is one deck Copper Foil 402, as ground plane and screen layer, be ground floor above the ground plane 402, comprise radio frequency chip 406, peripheral circuit 405, feedback point 404 and planar antenna 403, feedback point 404 is that a point on the planar antenna 403 is (such as free end or middle certain point of antenna, the selection of feedback point can be by the known technology of existing field of antenna), feedback point 404 also links to each other with radio frequency chip 406 by peripheral circuit 405, radio frequency chip 406 adopts the nRF24L01 of Nordic company, the nRF24LE1 radio frequency chip, its radio transmitted power is-the positive and negative 4dbm of 18dbm, the frequency central point is 2400～2520Mhz, adopts the GFSK modulating mode.
On the basis of technique scheme, this device comprises two layers of wiring board, be of a size of standard size and the profile of SIM cards of mobile phones, adopt helical aerials 502, the back side 503 of device is metal covering, the back side 503 is as ground plane, feedback point 504 is that a point on the helical aerials 502 is (such as free end or middle certain point of antenna, the selection of feedback point can be by the known technology of existing field of antenna), feedback point 504 also links to each other with radio frequency chip 506 by peripheral circuit 505, and radio frequency chip 506 adopts the nRF24L01 of Nordic company, nRF24LE1 chip, its radio transmitted power are 0dbm, the frequency central point is 2400～2520Mhz, adopts the GFSK modulating mode.
On the basis of technique scheme, the peripheral circuit of device 501 comprises traditional SIM cards of mobile phones circuit.
The reader device that radio communication of the present invention is closely swiped the card, directly control the stable transmitting-receiving of radiofrequency signal by antenna and circuit design, overcome the shortcoming of 2.4G scattering, no matter in direction control, still in distance control, can both reach good effect; Do not need to do triggering with other frequencies, reduced complex degree of system design, reduced risk and cost, improved the stability of system, more be conducive to industrialization.
The present invention designs ingenious, and is simple in structure, implements reliable and stablely, can effectively solve Card Reader direction and the Card Reader distance of the reader device that radio communication closely swipes the card.
Description of drawings
The present invention has following accompanying drawing:
Fig. 1 round screw thread antenna,
Fig. 2 ellipse spiral shape antenna,
Fig. 3 bifilar helix antenna,
Fig. 4 Tai Ji helical aerials,
Fig. 5 planar antenna synoptic diagram,
The reader device synoptic diagram that Fig. 6 radio communication is closely swiped the card,
The reader device embodiment one that Fig. 7 radio communication is closely swiped the card,
The reader device embodiment two that Fig. 8 radio communication is closely swiped the card,
Fig. 9 polarised direction synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
The reader device that radio communication of the present invention is closely swiped the card, wherein said high frequency refers to the radiofrequency signal that 200MHz is above, such as various frequencies such as 315MHz, 433MHz, 915MHz, 2.4G, 5.8G, of the present invention reaching for example discussed mainly based on 2.4G, but is equally applicable to other high-frequency band.
All be to adopt ceramic antenna for 2.4G generally, whip antenna, rhombic aerial, F type antenna etc., and in order to reduce the design area of reader device, common design all is to adopt ceramic antenna, rhombic aerial can only form polarization at four direction, F type antenna can only form polarization at both direction, its essence of ceramic antenna is exactly whip antenna, because volume is little, the polairzed area that forms is very limited, the set of the polarised direction that the different point on these antenna forms can not cover 360 °, can not on 360 ° direction, evenly distribute in the energy field on the antenna like this, its radiofrequency signal must be that power does not wait on different directions, and radiofrequency signal can not evenly distribute on the reader device surface.On the other hand, such design does not consider that other elements on the reader device are to the influence of radiofrequency signal, do not consider that more the feedback point is to the influence of radio frequency signal distributions, this just must cause radiofrequency signal, and some places can be very strong on the reader device surface, some places can be a little less than, some places are the blind area still, add the scattering properties of 2.4G, sort signal distributes strong and weak characteristic can be obvious especially, in the reality test, the close direction of different mobile phones is different with angle, presents very large difference in the distance of swiping the card, and this is influence the said 2.4G high-frequency signal in front to receive and dispatch, one of the major reason of effect of swiping the card.
In order to solve the even distribution of radiofrequency signal on the reader device that radio communication closely swipes the card, the present invention does the as a whole consideration that designs with Card Reader face, feedback point, radio frequency chip and the peripheral circuit thereof of the distribution of antenna, reader device that radio communication is closely swiped the card.
The reader device that radio communication of the present invention is closely swiped the card as shown in Figure 6, comprising:
A planar antenna 301, the set 702 of the polarised direction 701 that different points produces on this antenna can cover 360 °, as shown in Figure 9, the top, plane that this antenna covers is effective Card Reader zone 303 of the reader device that radio communication closely swipes the card, as shown in Figure 6, that is: the top on the plane of this antenna covering is Card Reader face and Card Reader zone; Described polarised direction refers to the direction of electric field, that is: the direction of an electric field in the electromagnetic wave of antenna space radiation towards periphery,
Among the present invention, described planar antenna is evenly distributed on the plane, referring to Fig. 5, to guarantee that its energy field distributes relatively uniformly, planar antenna can be varied, for example can be: round screw thread antenna (referring to Fig. 1), ellipse spiral shape antenna (referring to Fig. 2), the bifilar helix antenna is (referring to Fig. 3, also be a kind of Tai Ji helical aerials), Tai Ji helical aerials (referring to Fig. 4), its key character is to be evenly distributed on relatively on the plane, and the set 702 of the different formed polarised direction 701 of point on this antenna can cover 360 °, and the polarised direction coverage diagram is referring to Fig. 9, can adopt existing known technology to realize polarised direction shown in Figure 9, no longer describe in detail among the application.Described planar antenna also can be to be evenly distributed on the plane by a core assembly chip antenna to constitute;
Below planar antenna, can increase a ground plane 302, this ground plane can be certain metal material, such as one deck Copper Foil, this ground plane can play reflex to the signal that planar antenna produces, undesired signal to other circuit or components and parts generation has absorption simultaneously, this ground plane also can be used as screen layer, will be above the ground plane and following signal separately, be conducive to present a little design and the design of radio frequency peripheral circuit;
If below ground plane, install interference source additional, also can better strengthen and protect the signal transmitting and receiving of Card Reader face;
Radio frequency chip links to each other with planar antenna 301 by the feedback point.
It below is a specific embodiment of the present invention.
As shown in Figure 7, the reader device that the radio communication shown in this specific embodiment is closely swiped the card comprises that 401, first to fourth layers of four layers of wiring boards are stacked successively from top to bottom, and ground floor comprises antenna for transmitting and receiving circuit; The second layer is ground connection and screen layer; The 3rd layer is the connecting circuit between each layer, and the 4th layer is the interference shielding circuit,
The described second layer is one deck Copper Foil 402, as ground plane and screen layer, be ground floor above the ground plane 402, comprise radio frequency chip 406, peripheral circuit 405, feedback point 404 and planar antenna 403, feedback point 404 is that a point on the planar antenna 403 is (such as free end or middle certain point of antenna, the selection of feedback point can be by the known technology of existing field of antenna), feedback point 404 also links to each other with radio frequency chip 406 by peripheral circuit 405, radio frequency chip 406 can adopt the nRF24L01 of Nordic company, radio frequency chips such as nRF24LE1, its radio transmitted power is-the positive and negative 4dbm of 18dbm, the frequency central point is 2400～2520Mhz, adopts the GFSK modulating mode.
It below is another specific embodiment of the present invention.
As shown in Figure 8, the reader device 501 that radio communication shown in this specific embodiment is closely swiped the card is the reader device that the radio communication of two layer line road plate structures is closely swiped the card, be of a size of standard size and the profile of SIM cards of mobile phones, adopt helical aerials 502, the back side 503 of device is metal covering, the back side 503 is as ground plane, be provided with SIM card standard contacts 507, feedback point 504 is that a point on the helical aerials 502 is (such as free end or middle certain point of antenna, the selection of feedback point can be by the known technology of existing field of antenna), feedback point 504 also links to each other with radio frequency chip 506 by peripheral circuit 505, radio frequency chip 506 can adopt the nRF24L01 of Nordic company, chips such as nRF24LE1, its radio transmitted power is 0dbm, and the frequency central point is 2400～2520Mhz, adopts the GFSK modulating mode.Reader device with the radio communication of this standard SIM size is closely swiped the card inserts the mobile phone deck, by the battery of mobile phone power taking.
The peripheral circuit of device 501 can comprise traditional SIM cards of mobile phones circuit.
The reader device that two radio communications shown in Fig. 7,8 are closely swiped the card is matching used in actual use, device shown in Figure 7 can be installed in the equipment of the businessman that needs new application such as stored value card, mobile phone gate inhibition, mobile-phone payment, and device shown in Figure 8 can be installed in the user's who uses new application such as stored value card, mobile phone gate inhibition, mobile-phone payment the mobile phone.
Power up for 401 devices as shown in Figure 7, when the emissive power of nRF24L01 is-the positive and negative 4dbm of 18dbm, to be inserted with the mobile phone of 501 devices near 401 Card Readers, its Card Reader direction be the Card Reader face directly over, by 300 main on the market multi-section different brands and the mobile phone of model are tested, the Card Reader stable distance satisfies the requirement that mobile payment is swiped the card at 3-10cm.
When under the ground plane of 401 devices, installing interference source additional, can more effective command range and increase security.
In particular cases, when allowing the Card Reader face that the Card Reader blind area is arranged, the set of the different formed polarised direction of point on the antenna of the present invention can be less than 360 ° covering, such as 350 ° coverings etc.
The present invention designs ingenious, and is simple in structure, effectively solved a high-frequency radio frequency control of communication difficult problem, particularly solved the mobile payment difficult problem of 2.4G, and the development of mobile Internet, ecommerce and Internet of Things is had significant meaning.
Claims (8)
1. the reader device that radio communication is closely swiped the card is characterized in that, comprising:
A planar antenna (301), the set (702) of the polarised direction (701) that different point produces on this antenna can cover 360 °, and the top, plane that this antenna covers is effective Card Reader zone (303) of the reader device that radio communication closely swipes the card,
Below planar antenna, be provided with a ground plane (302),
Radio frequency chip links to each other with planar antenna (301) by the feedback point.
2. the radio communication as claimed in claim 1 reader device of closely swiping the card, it is characterized in that: described planar antenna (301) is round screw thread antenna, ellipse spiral shape antenna, bifilar helix antenna or Tai Ji helical aerials.
3. the radio communication as claimed in claim 1 reader device of closely swiping the card, it is characterized in that: described planar antenna (301) is evenly distributed on the plane by a core assembly chip antenna and constitutes.
4. the radio communication as claimed in claim 1 reader device of closely swiping the card, it is characterized in that: described ground plane (302) is one deck Copper Foil.
5. the radio communication as claimed in claim 1 reader device of closely swiping the card, it is characterized in that: the below at ground plane (302) is provided with interference source.
6. the radio communication as claimed in claim 1 reader device of closely swiping the card, it is characterized in that: this device comprises one four layers wiring board (401), and first to fourth layer is stacked successively from top to bottom, and ground floor comprises antenna for transmitting and receiving circuit; The second layer is ground connection and screen layer; The 3rd layer is the connecting circuit between each layer, and the 4th layer is the interference shielding circuit,
The described second layer is one deck Copper Foil (402), as ground plane and screen layer, be ground floor above the ground plane (402), comprise radio frequency chip (406), peripheral circuit (405), feedback point (404) and planar antenna (403), feedback point (404) is a point on the planar antenna (403), feedback point (404) also links to each other with radio frequency chip (406) by peripheral circuit (405), radio frequency chip (406) adopts the nRF24L01 of Nordic company, the nRF24LE1 radio frequency chip, its radio transmitted power is-the positive and negative 4dbm of 18dbm, the frequency central point is 2400～2520Mhz, adopts the GFSK modulating mode.
7. the radio communication as claimed in claim 1 reader device of closely swiping the card, it is characterized in that: this device comprises two layers of wiring board, be of a size of standard size and the profile of SIM cards of mobile phones, adopt helical aerials (502), the back side (503) of device is metal covering, the back side (503) is as ground plane, feedback point (504) is a point on the helical aerials (502), feedback point (504) also links to each other with radio frequency chip (506) by peripheral circuit (505), radio frequency chip (506) adopts the nRF24L01 of Nordic company, the nRF24LE1 chip, its radio transmitted power is 0dbm, and the frequency central point is 2400～2520Mhz, adopts the GFSK modulating mode.
8. the radio communication as claimed in claim 7 reader device of closely swiping the card, it is characterized in that: the peripheral circuit of device (501) comprises traditional SIM cards of mobile phones circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100415617A CN103294976A (en) | 2012-02-23 | 2012-02-23 | Card reading device for radio frequency communication close-range card swiping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100415617A CN103294976A (en) | 2012-02-23 | 2012-02-23 | Card reading device for radio frequency communication close-range card swiping |
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| Publication Number | Publication Date |
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| CN103294976A true CN103294976A (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100415617A Pending CN103294976A (en) | 2012-02-23 | 2012-02-23 | Card reading device for radio frequency communication close-range card swiping |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105977650A (en) * | 2016-05-19 | 2016-09-28 | 北京小米移动软件有限公司 | Antenna assembly |
| WO2020093826A1 (en) * | 2018-11-09 | 2020-05-14 | 阿里巴巴集团控股有限公司 | Mobile payment method and apparatus, and electronic device |
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| CN101577740A (en) * | 2008-05-07 | 2009-11-11 | Gkn科技株式会社 | Mobile communication terminal having subscriber identification module card capable of near field communication |
| CN101609924A (en) * | 2008-06-20 | 2009-12-23 | 上海中京电子标签集成技术有限公司 | A kind of high-frequency tag antenna that can realize that many moneys chip uses |
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| CN2802589Y (en) * | 2005-05-16 | 2006-08-02 | 厦门信达汇聪科技有限公司 | Hand ultra-high frequency read-write apparatus |
| CN101572345A (en) * | 2008-04-29 | 2009-11-04 | Ls美创有限公司 | End-fed planar type spiral antenna |
| CN101577740A (en) * | 2008-05-07 | 2009-11-11 | Gkn科技株式会社 | Mobile communication terminal having subscriber identification module card capable of near field communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105977650B (en) * | 2016-05-19 | 2019-02-12 | 北京小米移动软件有限公司 | A kind of antenna module |
| WO2020093826A1 (en) * | 2018-11-09 | 2020-05-14 | 阿里巴巴集团控股有限公司 | Mobile payment method and apparatus, and electronic device |
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Application publication date: 20130911 |