CN102810175B - A kind of SD card and radio-frequency recognition system thereof - Google Patents
A kind of SD card and radio-frequency recognition system thereof Download PDFInfo
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- CN102810175B CN102810175B CN201110172616.3A CN201110172616A CN102810175B CN 102810175 B CN102810175 B CN 102810175B CN 201110172616 A CN201110172616 A CN 201110172616A CN 102810175 B CN102810175 B CN 102810175B
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Abstract
The invention provides a kind of SD card, comprise controller, intelligent card chip, storer and radiofrequency antenna made of metamaterial, described intelligent card chip is connected with described controller respectively with described storer, described radiofrequency antenna made of metamaterial is connected with described intelligent card chip, described radiofrequency antenna made of metamaterial comprises medium substrate, feeder line and be attached to the sheet metal on medium substrate one surface, described feeder line is by sheet metal described in coupling scheme feed-in, on described sheet metal, hollow out has micro groove structure to form metal routing on sheet metal, described radiofrequency antenna made of metamaterial is preset with the space that electronic component embeds.According to SD card of the present invention, employing be the radiofrequency antenna made of metamaterial being easy to miniaturization, can not need to be limited to operator, realize the functions such as mobile payment, the saving being conducive to cost with apply on a large scale.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of SD card and there is the radio-frequency recognition system of this SD card.
Background technology
Along with the change with rapid changepl. never-ending changes and improvements of expanding economy and infotech, China has movable equipment, and such as the user of mobile phone, PDA, panel computer etc. is more than 700,000,000.Add in movable equipment payment function can reduce inconvenience that people carry one's purse along and people are enjoyed pay whenever and wherever possible convenient, therefore, mobile payment is subject to increasing attention, and in a foreseeable future has wide business development space.
The mobile payment device developed at present has RFID-SIM card, i.e. radio-frequency (RF) identification SIM card.It realizes the function of closely identification and financial payment by internal short-range identification chip in SIM card on mobile phone.But this type of radio-frequency (RF) identification SIM card is limited to telecom operators, and only can be applied to and has on the mobile device of call function.
SD card, as the memory card of all kinds of mobile device, is widely used.Use SD card to realize restriction that closely identification and financial payment function just can break away from telecom operators.But due to the rf frequency of mobile payment lower, in therefore current technical scheme, according to traditional antenna design proposal by comparatively large for the volume causing antenna, do not meet the development trend of mobile device miniaturization.
Summary of the invention
Technical matters to be solved by this invention is, for the above-mentioned deficiency of prior art, propose a kind of SD card, this SD card is integrated with the radiofrequency antenna made of metamaterial of miniaturization.
The present invention solves the problems of the technologies described above adopted technical scheme and is to provide a kind of SD card, comprise controller, intelligent card chip, storer and radiofrequency antenna made of metamaterial, described intelligent card chip is connected with described controller respectively with described storer, described radiofrequency antenna made of metamaterial is connected with described intelligent card chip, described radiofrequency antenna made of metamaterial comprises medium substrate, feeder line and be attached to the sheet metal on medium substrate one surface, described feeder line is by sheet metal described in coupling scheme feed-in, on described sheet metal, hollow out has micro groove structure to form metal routing on sheet metal, described radiofrequency antenna made of metamaterial is preset with the space that electronic component embeds.
In the present invention, described spatial placement feeder line, between feeder line and sheet metal and these three positions of sheet metal at least one on.
In the present invention, on the metal routing of described spatial placement on sheet metal.
In the present invention, described spatial placement on micro groove structure, and connects the metal routing of micro groove structure both sides.
In the present invention, described micro groove structure comprise complementary opening resonance loop structure, complementary helix structure, opening helical ring structure, two opening helical ring structure, complementary folding line structure and derived by several structure above, micro groove structure that compound or group battle array obtain.
In the present invention, described SD card also comprises card substrate, and described controller, intelligent card chip and storer are arranged on the side of card substrate on the surface.
In the present invention, described radiofrequency antenna made of metamaterial is arranged on the side of card substrate on the surface.
In the present invention, described radiofrequency antenna made of metamaterial is arranged on the inside of card substrate.
In the present invention, described micro groove structure is respectively formed on described sheet metal by etching, boring quarter, photoetching, electronics quarter or ion quarter.
According to SD card of the present invention, employing be the radiofrequency antenna made of metamaterial being easy to miniaturization, can not need to be limited to operator, realize the functions such as mobile payment, and not need to increase impedance matching network, the saving being conducive to cost with apply on a large scale.In addition, of the present invention by arranging the space that electronic component embeds in radiofrequency antenna made of metamaterial, and by changing the performance of electronic component that embeds to finely tune the performance of antenna, design the radiofrequency antenna made of metamaterial meeting adaptability and versatility requirement, the SD card of different operating frequency can be realized.
The present invention also provides a kind of radio-frequency recognition system in addition, comprises reader and transponder, and described transponder is above-mentioned SD card.
Accompanying drawing explanation
Fig. 1 is radiofrequency antenna made of metamaterial structural representation of the present invention;
Fig. 2 is the structural representation of radiofrequency antenna made of metamaterial first embodiment of the present invention;
Fig. 3 is the structural representation of radiofrequency antenna made of metamaterial second embodiment of the present invention;
Fig. 4 is the structural representation of radiofrequency antenna made of metamaterial of the present invention 3rd embodiment;
Fig. 5 is the structural representation of radiofrequency antenna made of metamaterial of the present invention 4th embodiment;
Fig. 6 is the structural representation of radiofrequency antenna made of metamaterial of the present invention 5th embodiment;
Fig. 7 a is the schematic diagram of complementary opening resonance loop structure;
Fig. 7 b is depicted as the schematic diagram of complementary helix structure;
Fig. 7 c is depicted as the schematic diagram of opening helical ring structure;
Fig. 7 d is depicted as the schematic diagram of two opening helical ring structure;
Fig. 7 e is depicted as the schematic diagram of complementary folding line structure;
Fig. 8 a derives schematic diagram for its geometric configuration of complementary opening resonance loop structure shown in Fig. 7 a;
Fig. 8 b is the derivative schematic diagram of its expansion of the complementary opening resonance loop structure shown in Fig. 7 a;
Structural representation after the compound that Fig. 9 a is the complementary opening resonance loop structure shown in three Fig. 7 a;
Fig. 9 b is depicted as the compound schematic diagram of complementary helix structure for the complementary opening resonance loop structure shown in two Fig. 7 a and Fig. 7 b;
Figure 10 is the structural representation after the complementary opening resonance loop structure group battle array shown in four Fig. 7 a.
Figure 11 shows that the structural representation of SD card of the present invention.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
Figure 11 shows that the structural representation of SD card of the present invention.In Figure 11, SD card comprises card substrate 100 and is arranged at controller 101, intelligent card chip 102, storer 103 and the radiofrequency antenna made of metamaterial 104 on surface, card substrate 100 side.Wherein, intelligent card chip 102 is connected with controller 101 respectively with storer 103, and intelligent card chip 102 is connected with radiofrequency antenna made of metamaterial 104 by corresponding antenna leads simultaneously.Controller 101 is for identifying the operation of external unit to SD card, intelligent card chip 102 can receive the signal that the transmission of described radiofrequency antenna made of metamaterial 104 comes, and the application data information of self is sent to described radiofrequency antenna made of metamaterial by the form of electric signal, described intelligent card chip storage inside has application data, realizes various non-contact application.Such as mobile phone wallet, mobile phone mass transit card etc.
In the present embodiment, controller, intelligent card chip and storer all can use conventional prior art, its inner structure and working method are conventionally known to one of skill in the art, the closing form of SD card is also same as the prior art simultaneously, and be not main inventive technical essential of the present invention, be not therefore described in detail at this.Meanwhile, in order to the circuit module making radiofrequency antenna made of metamaterial 104 do not clamped the mobile device inside of carrying by SD disturbs, radiofrequency antenna made of metamaterial 104 can be arranged at the outer ledge of SD card.Radiofrequency antenna made of metamaterial 104 can certainly be arranged on the inside of card substrate 100, make the miniaturization of SD card further, save the space that SD card is shared in a mobile device.
The radio frequency standard being applied to mobile payment field is generally Frequency, such as 13.56MHZ or 2.4GHZ, and in order to make SD card can work in this low frequency, the effect of antenna is particularly important.But according to traditional antenna design proposal, the length of antenna is directly proportional to wavelength, and frequency is lower, wavelength is longer thus cause antenna volume larger.Traditionally antenna design, frequency of operation is still for 13.56MHZ or 2.4GHZ, and the thickness of antenna and length are all comparatively large, is difficult to realize the application on SD card.And in order to ensure the high-performance of antenna, traditional radio-frequency antenna generally also needs to increase impedance matching network.
Meta Materials is arranged on base material by the man-made microstructure with certain pattern form to form, and the pattern form that man-made microstructure is different and dimensional structure make Meta Materials have different specific inductive capacity and different magnetic permeabilities thus make Meta Materials have different electromagnetic responses.Wherein, when this man-made microstructure is in resonance band, this man-made microstructure will show the dispersion characteristics of height, and the dispersion characteristics of so-called height refer to the impedance of this man-made microstructure, hold perception, equivalent specific inductive capacity and magnetic permeability along with frequency, and violent change can occur.
The present invention utilizes the above-mentioned principle of Meta Materials, design a kind of radiofrequency antenna made of metamaterial, micro groove structure is formed on radiation sheet metal, the coupling of this radiation sheet metal and feeder line make antenna have abundant radiation characteristic thus the design of saving impedance matching network to realize the miniaturization of antenna.Above-mentioned micro groove structure is a kind of form of man-made microstructure.SD card of the present invention can be applied in mobile phone, PDA, MP3, MP4, computer and digital camera, and the form of its SD card interface is consistent with existing.
Core of the present invention is radiofrequency antenna made of metamaterial, below describes radiofrequency antenna made of metamaterial of the present invention in detail.
As shown in Figure 1, described radiofrequency antenna made of metamaterial 104 of the present invention comprises medium substrate 1, feeder line 2, is attached to the sheet metal 4 on medium substrate 1 one surface, described feeder line 2 is by sheet metal 4 described in coupling scheme feed-in, described sheet metal 4 is formed with micro groove structure 41 to form metal routing 42 on sheet metal, described radiofrequency antenna made of metamaterial 104 is preset with the space 6 that electronic component embeds.In Fig. 1 to Fig. 6, the part of the cross-hatching on sheet metal 4 is metal routing 42, and the blank parts (part of hollow out) on sheet metal 4 represents micro groove structure 41.In addition, feeder line 2 also represents with profile line.
Feeder line 2 arranges to realize signal coupling around sheet metal 4.Sheet metal 4 can contact with feeder line 2 in addition, also can not contact.When sheet metal 4 contacts with feeder line 2, inductive coupled between feeder line 2 and sheet metal 4; When sheet metal 4 does not contact with feeder line 2, capacitive coupling between feeder line 2 and sheet metal 4.
Described micro groove structure 41 in the present invention can be the complementary helix structure shown in the complementary opening resonance loop structure shown in Fig. 7 a, Fig. 7 b, a kind of in the two opening helical ring structures shown in the opening helical ring structure shown in Fig. 7 c, Fig. 7 d, the complementary folding line structure shown in Fig. 7 e or derived by several structure above, micro groove structure that compound or group battle array obtain.Derive and be divided into two kinds, one is that geometric configuration derives, another kind is that expansion is derivative, and geometric configuration is herein derivative refers to that function class derives like, variform structure, such as, derive to class of a curve structure, triangle class formation and other different polygon class formation by square frame class formation; Namely expansion herein derives offers new groove to form new micro groove structure on the basis of Fig. 7 a to Fig. 7 e; For the complementary opening resonance loop structure shown in Fig. 7 a, Fig. 8 a derives schematic diagram for its geometric configuration, and Fig. 8 b derives schematic diagram for its geometric configuration.Compound herein refers to, the micro groove structure that micro groove structure multiple superposition formation one of Fig. 7 a to Fig. 7 e is new, as illustrated in fig. 9, is the structural representation after the complementary opening resonance loop structure compound shown in three Fig. 7 a; As shown in figure 9b, for the complementary opening resonance loop structure shown in two Fig. 7 a and Fig. 7 b are depicted as the structural representation after the common compound of complementary helix structure.Group battle array herein refers to and forms an overall micro groove structure by the micro groove structure array on same sheet metal shown in multiple Fig. 7 a to Fig. 7 e, as shown in Figure 10, is the structural representation after multiple complementary opening resonance loop structure group battle array as shown in Figure 7a.All set forth the present invention for the opening helical ring structure shown in Fig. 7 c below.
Five embodiments are divided to introduce the present invention in detail below.
First embodiment
As shown in Figure 2, in the present embodiment, feeder line 2 is preset with the space 51 embedding perceptual electronic component and/or resistance, the position in the embedding electronic component space of presetting can be the optional position on feeder line 2, and can have multiple.Perceptual electronic component can be embedded, to change the inductance value on feeder line 2 in space 51.Using formula:
square being inversely proportional to, so when the frequency of operation needed be lower frequency of operation, by suitable embedding inductance or the realization of perceptual electronic component of the size of known inductance value and frequency of operation.In the present embodiment, the inductance value range of the perceptual electronic component added is between 0-5uH, if too large alternating signal will be consumed by inductive element thus have influence on the radiation efficiency of antenna.The described antenna of the present embodiment has the good radiation characteristic of multiple frequency range, five main radiation frequencies are distributed to 5.5GHz from 900MHz always, almost cover GSM, CDMA, bluetooth, W-Lan (IEEE802.11 agreement), each main communication frequency such as GPS, TD-LTE, there is very high integrated level and change the object of operating frequency of antenna by regulating the inductance value on feeder line to reach.Certainly, also can in space 51 embedded resistor, to improve the radiation resistance of antenna.Certainly, the space on feeder line also can be multiple, wherein distinguishes embedded resistor and perceptual electronic component, has both achieved the adjustment of frequency of operation, and can improve again the radiation resistance of antenna.Do not add the space available wire short circuit of electronic component.
Embodiment two
As shown in Figure 3, in the present embodiment, be preset with the space 53 embedding capacitive electrical element between feeder line 2 and sheet metal 4, the position in the embedding electronic component space of presetting can be the optional position between feeder line 2 and sheet metal 4.In Fig. 3, space 53 is the space embedding capacitive electrical element in the present embodiment, itself has certain electric capacity between feeder line 2 and sheet metal 4, here by embedding the signal coupling between capacitive electrical element regulation feeder line and sheet metal 4, using formula:
square being inversely proportional to, so when the frequency of operation needed be lower frequency of operation, by suitable embedded capacitor or the realization of perceptual electronic component of the size of known capacitance and frequency of operation.In the present embodiment, the capacitance value range of the capacitive electrical element added is usually between 0-2pF, but the capacitance embedded along with the change of operating frequency of antenna also may exceed the scope of 0-2pF.Certainly, also multiple space can be preset between feeder line 2 and sheet metal 4.Equally, in the space not being connected with electronic component, adopt wire short circuit.
Embodiment three
As shown in Figure 4, in the present embodiment, the metal routing 42 of sheet metal is reserved with the space embedding perceptual electronic component and/or resistance, and the space embedding electronic component is not only confined to the space 55 that provides in figure and space 56, as long as other positions satisfy condition.The object embedding perceptual electronic component is herein the inductance value increasing sheet metal internal resonant structure, thus plays the effect of adjustment to the resonance frequency of antenna and bandwidth of operation; Identical with embodiment one, the object of embedded resistor improves the radiation resistance of antenna herein.So to embedding perceptual electronic component or resistance, then determine as required.In addition in the space not embedding electronic component, adopt wire short circuit.
Embodiment four
As shown in Figure 5, in the present embodiment, micro groove structure 41 is reserved with the space 57 embedding capacitive electrical element, and described space 57 connects the metal routing 42 of micro groove structure 41 both sides.Embed the space of electronic component not only to limit to and the space 57 that provides in Fig. 5, as long as other positions satisfy condition.Embed the resonance performance that capacitive electrical element can change sheet metal, finally improve Q value and the resonant operational point of antenna.As common practise, we know, the pass of passband BW and resonance frequency w0 and quality factor q is: BW=wo/Q, and this formula shows, Q is larger, and then passband is narrower, and the less then passband of Q is wider.Separately have: Q=wL/R=1/wRC, wherein, Q is quality factor; Supply frequency when w is circuit resonance; L is inductance; R is the resistance of string; C is electric capacity, and from Q=wL/R=1/wRC formula, Q and C is inverse ratio, therefore, can reduce Q value, passband is broadened by adding capacitive electrical element.
Embodiment five
As shown in Figure 6, in the present embodiment, at feeder line 2, the space that electronic component embeds all is set between feeder line 2 and sheet metal 4 and on these three positions of sheet metal 4.Wherein, the space on sheet metal 4 comprises the space that is arranged on metal routing 42 and to be arranged on micro groove structure 41 and to connect the space of the metal routing 42 of both sides.Particularly, space in the present embodiment comprises the space 61 on feeder line 2, space 63 between feeder line 2 and sheet metal 4, the space 65,66 on metal routing 42, the space 67 on micro groove structure 41, certainly, the position provided in the present embodiment is not uniqueness, in the present embodiment, adds electronic component to regulate the performance of antenna in above-mentioned space, the principle of its principle and embodiment one to four is similar, and the present embodiment no longer describes.
In radiofrequency antenna made of metamaterial 104 of the present invention, the reserved location in space is not limited to above-mentioned five kinds of forms, as long as space is arranged on antenna.Such as, space can also be arranged on medium substrate.
Described electronic component of the present invention is perceptual electronic component, capacitive electrical element or resistance.Add this type of electronic component in the headspace of antenna after, the various performances of antenna can be improved.And by adding the electronic component of different parameters, the adjustable of antenna performance parameters can be realized.Therefore, antenna of the present invention can be the same structure before not adding any element, just by adding different electronic components at diverse location, and the parameter of electronic component (inductance value, resistance value, capacitance), realize the performance parameter of different antennae.Namely versatility is achieved.Significantly can reduce production cost.
Described space of the present invention can be pad, also can be a vacancy.The structure of pad can see the pad on common circuit board.Certainly, what the design consideration of its size was different needs meeting different.
In addition, in the present invention, medium substrate 1 can be made up of stupalith, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material.Preferably, being made up of macromolecular material, can be the macromolecular materials such as FR-4, F4B particularly.
In the present invention, sheet metal 4 is copper sheet or silver strip.Be preferably copper sheet, cheap, conduct electricity very well.
In the present invention, feeder line 2 selects the material same with sheet metal 4 to make.Be preferably copper.
In the present invention, the processing and manufacturing of radiofrequency antenna made of metamaterial, as long as meet design concept of the present invention, can adopt various manufacture.Prevailing method is the manufacture method using all kinds of printed circuit board (PCB) (PCB), and certainly, the PCB of double-sided copper-clad manufactures and also can meet processing request of the present invention.Except this processing mode, other manufacturing process can also be introduced according to the actual needs, such as (RFID is the abbreviation of Radio FrequencyIdentification to RFID, i.e. REID, is commonly called as electronic tag) in use conductive silver paste ink processing mode, all kinds of can the processing mode that combines of the flexible PCB processing of deformable element, the processing mode of iron plate antenna and iron plate and PCB.Wherein, iron plate and PCB Combined machining mode refer to and utilize the accurate processing of PCB to complete the processing of radiofrequency antenna made of metamaterial micro groove structure, complete other slave part with iron plate.In addition, the method can also carved by etching, electroplating, bore quarter, photoetching, electronics quarter or ion is processed.Wherein etching is preferably manufacturing process, and its step is after designing the topological pattern of suitable micro groove structure, by etching machines, utilizes the chemical reaction of solvent and metal to get rid of the metallic member of default micro groove structure pattern on radiation sheet metal.
The present invention also provides a kind of radio-frequency recognition system in addition, comprises reader and transponder, and described transponder is above-mentioned SD card.Described reader is conventional reader.Reader launches the radio wave energy of a characteristic frequency to SD card, and in order to drive SD card the application data be stored on intelligent card chip to be sent, now reader just received in sequence unscrambling data, gives application program and do corresponding process.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (8)
1. a SD card, comprise controller, intelligent card chip, storer and radiofrequency antenna made of metamaterial, described intelligent card chip is connected with described controller respectively with described storer, described radiofrequency antenna made of metamaterial is connected with described intelligent card chip, it is characterized in that, described radiofrequency antenna made of metamaterial comprises medium substrate, feeder line and be attached to the sheet metal on medium substrate one surface, described feeder line is by sheet metal described in coupling scheme feed-in, on described sheet metal, hollow out has micro groove structure to form metal routing on sheet metal, described radiofrequency antenna made of metamaterial is preset with the space that electronic component embeds,
Wherein, described spatial placement feeder line, between feeder line and sheet metal and these three positions of sheet metal at least one on; Or described spatial placement on micro groove structure, and connects the metal routing of micro groove structure both sides;
Wherein, described electronic component is perceptual electronic component, capacitive electrical element or resistance, and the inductance value range of described perceptual electronic component is between 0-5uH;
Wherein, described radiofrequency antenna made of metamaterial is arranged on the outer ledge of described SD card.
2. SD card according to claim 1, is characterized in that, on the metal routing of described spatial placement on sheet metal.
3. SD card as claimed in claim 1, it is characterized in that, described micro groove structure comprise complementary opening resonance loop structure, complementary helix structure, opening helical ring structure, two opening helical ring structure, complementary folding line structure and derived by several structure above, micro groove structure that compound or group battle array obtain.
4. SD card as claimed in claim 1, it is characterized in that, described SD card also comprises card substrate, and described controller, intelligent card chip and storer are arranged on the side of card substrate on the surface.
5. SD card as claimed in claim 4, it is characterized in that, described radiofrequency antenna made of metamaterial is arranged on the side of card substrate on the surface.
6. SD card as claimed in claim 4, it is characterized in that, described radiofrequency antenna made of metamaterial is arranged on the inside of card substrate.
7. SD card as claimed in claim 1, is characterized in that, described micro groove structure by etching, bore quarters, photoetching, electronics quarter or ion and be respectively formed on described sheet metal quarter.
8. a radio-frequency recognition system, comprises reader and transponder, it is characterized in that, described transponder is the SD card described in claim 1 to 7 any one.
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| CN201110172616.3A CN102810175B (en) | 2011-06-24 | 2011-06-24 | A kind of SD card and radio-frequency recognition system thereof |
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| CN201110172616.3A CN102810175B (en) | 2011-06-24 | 2011-06-24 | A kind of SD card and radio-frequency recognition system thereof |
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| CN202217303U (en) * | 2011-06-24 | 2012-05-09 | 深圳光启高等理工研究院 | SD card (security digital memory card) and RF (radio frequency) recognition system thereof |
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| Publication number | Publication date |
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| CN102810175A (en) | 2012-12-05 |
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