CN1551046A - IC card - Google Patents
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- CN1551046A CN1551046A CNA2004100447524A CN200410044752A CN1551046A CN 1551046 A CN1551046 A CN 1551046A CN A2004100447524 A CNA2004100447524 A CN A2004100447524A CN 200410044752 A CN200410044752 A CN 200410044752A CN 1551046 A CN1551046 A CN 1551046A
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Abstract
Provided is an excellent IC card adapted so as not to cause deterioration of receiving sensitivity of wireless communication function of a cellular phone or PHS. The IC card is shielded with a radio absorber or a ferrite sheet to prevent the external release of a harmonic wave of 13.56 MHz generated within the IC card. By using a material having no influence on 13.56 MHz, the function of the IC card can be kept. Since intrusion of a carrier frequency of portable wireless equipment into the IC card can be prevented by shielding the IC card, generation of a spurious transmission can be also prevented.
Description
Technical field
The present invention relates to a kind of interrogating signal of sending by reader device side that constitutes by electromagnetic wave of replying with primary coil, and the IC-card with secondary coil is sent the non-contact IC card of answer signal by load change, particularly can be built in portable telephone and PHS (PersonalHandyphone System: the IC-card that communicates of the reader device in the portable wireless apparatus such as the personal portable system).
Background technology
As an example of the radio communication device that only can be suitable in the part, can enumerate contactless IC card is example.
This radio communication generally is that realize on the basis with the electromagnetic induction principle.Promptly, by the IC-card that has memory function and, the card reader/writer of carrying out read/write access at the storer of IC-card constitutes, and is formed with as the toroid winding of the IC-card side of primary coil with as the antenna of the card reader/writer side of secondary coil 1 transformer as system.And, from the card reader/writer side IC-card being transmitted electric power and information by same electromagnetic induction effect, the IC-card side can drive by the electric power that is provided and at replying from the interrogating signal of card reader/writer side.
In the card reader/writer side, cross the electric current of antenna by modulated stream, receive the effect of modulation by the toroidal induced voltage on the IC-card, can carry out sending from the data of card reader/writer to IC-card.And IC-card is by the load change between toroidal terminal, and by the impedance variation between the antenna terminal of IC-card card reader/writer side, antenna flow through the effect that electric current and voltage change, carry out answer to card reader/writer.
In recent years, with the IC-card be the noncontact of representative or in abutting connection with communication system, because operational easy the beginning popularized.For example, by value informations such as password or other personal authentication's information, electronic ticket etc. are stored in the IC-card, be arranged on the card reader/writer that the gateway of Automatic Teller Machine or concert, the ticketing spot at station etc. are located, can read non-contactly with the IC-card that the user lifts and carry out authentication processing.
Recently, follow the raising of miniaturization technology, the IC-card of larger capacity storage space occurred having.Can store a plurality of application programs simultaneously owing to have the IC-card of mass storage, so one piece of IC-card can have multiple use.For example, on one piece of IC-card by storage be used for electronic accounting electronic money or, the multiple services such as electronic ticket that are used to enter the specific music meeting-place, just one piece of IC-card can be used on various purposes.
And then, IC-card and card reader/writer (card read-write equipment) be by having the wireline interface that being used for except that wireless or noncontact interface is connected with external unit, IC-card or Card Reader/a write side or the both in the card function can be built in portable telephone, PDA (PersonalDigital Assistant: personal digital assistant) or in the equipment such as personal computer.If like this card reader/writer is built in the portable wireless apparatus, the IC-card technology can be used in abutting connection with communication interface as having the two-way of versatility.When for example the identical device of computing machine or information household appliances equipment and so on constitutes in abutting connection with communication system, communicate by letter one to one.And when certain equipment also can communicate with the object-based device beyond the such equipment of contactless IC card, carry out the application that the one-to-many of an equipment and a plurality of cards communicates by letter and also can be paid attention to.
And the application service that begins to carry out various use IC-cards such as exchange of electronic accounting and the electronic value information outside can be implemented on the information processing terminal.For example, use user interfaces such as keyboard on the information processing terminal and display, can on the information processing terminal, carry out at the user interaction of IC-card.And,, just the personal authentication's information that is stored in the IC-card can be exchanged by telephone network by with Card Reader/write the card function to be connected on the portable telephone.And then the expense that is connected to the service that utilized on the internet by portable telephone just can be paid by IC-card.Perhaps, be proposed under the situation of value informations such as storing electronic money or electronic ticket on the IC-card, realize processing and other various services of value informations such as electronic accounting.For example, proposal is with IC-card or Card Reader/write the card function to be built in the portable wireless apparatus such as portable phone and PHS, utilize this portable wireless apparatus self radio communication function, utilize personal authentication's service of IC-card or utilize the charge of the value information that is recorded in IC-card to handle service.
The above-mentioned the sort of method that Card Reader/write card function is provided to portable communication device benefits really, but just very necessary for card reader/writer being built in middle-size and small-sizeization of portable equipment, generally use MOS (Metal Oxide Semiconductor: these circuit modules of technology actual installation metal-oxide semiconductor (MOS)) for this reason.So when constituting these circuit modules by the mos gate utmost point, because grid carries out work by square wave, the lead-out terminal of circuit module will be exported square wave.The higher hamonic wave that contains the integral multiple of basic frequency in this square wave becomes the reason that unwanted radiation produces.
For example, when being built in card reader/writer in the portable wireless apparatus, just have because the unwanted radiation that card reader/writer discharges, portable wireless apparatus is used for and problem (with reference to Fig. 1) that the antenna of base station communication is interfered.Equally, be built in card reader/writer in the portable wireless apparatus when communicating by letter with IC-card, the electromagnetic wave that also exists IC-card to send by card reader/writer drives and produces unwanted radiation when sending answer signal at interrogating signal, portable wireless apparatus is used for and problem (with reference to Fig. 2) that the antenna of base station communication is interfered.Because even portable phone and PHS are designed to have the higher sensitivity that also can receive a little less than the signal, so even the card reader/writer and the IC-card that are built in the equipment discharge the deterioration that faint higher hamonic wave also can cause receiving sensitivity.The problem of the unwanted radiation that discharges by card reader/writer when card reader/writer is built in portable wireless apparatus, for example be used for unwanted radiation is suppressed to the level of electric wave law regulation by adding low-pass filter, the wave filter that is used for covering the higher hamonic wave of characteristic frequency is inserted into card reader/writer with series system sends with terminal and card reader/writer and send, unwanted radiation can be suppressed to the level of electric wave law regulation with between the antenna.And then, propose to cover the wave filter of characteristic frequency by being connected in series, limit the also higher hamonic wave of attenuation of specific frequencies, these spies that are disclosed in the present inventor's proposition are willing in 2002-307175 number (application on October 22nd, 2002) invention.But in present IC-card design and manufacturing technology, it is difficult wave filter being set or changing antenna pattern at the IC-card internal circuit.That is to say, still exist about the radiation problem of the higher hamonic wave of IC-card.
In order to solve interfering with each other of IC-card and card reader/writer and portable wireless apparatus, can with the antenna of portable wireless apparatus and, the antenna that is assembled in this card reader/writer separates not that influence is provided with like that.But, because portable equipment generally all adopts the structure of miniaturization, portable wireless apparatus to be used for and the antenna of base station communication and to be assembled in card reader/writer in the equipment all be adjacent installation.So card reader/writer and the exterior I C card that communicates also are to be used for portable wireless apparatus and the adjacent use of antenna of base station communication.
And, decay to level even be assembled in higher hamonic wave that higher hamonic wave that the card reader/writer in the equipment discharges and exterior I C card discharge according to the electric wave law regulation, because portable wireless apparatus is designed to high sensitivity, so be obstructed even faint higher hamonic wave still can cause sensitivity.
Contactless IC card uses the 13.56MHz wave band usually, in other words, this means that it becomes the noise source of the integral multiple of 13.56MHz.On the other hand, what portable telephone used is the 800MHz wave band, and the 60-66 of 13.56MHz higher hamonic wave doubly will be disturbed communicating by letter between portable telephone and base station, and the receiving sensitivity of portable telephone also can deterioration (with reference to Fig. 3).This has just caused, for example at presence when IC-card such as charges at service, the communication of portable telephone might be interdicted halfway.
On the other hand, to portable telephone, stipulated peripherad noise below the specified level (for example for carrier wave be-below the 60dBc) transmission parasitic noise standard.But, the carrier frequency that portable wireless apparatus uses is loaded in card reader/writer that is built in portable wireless apparatus and the exterior I C card (with reference to Fig. 4) that carries out contactless communication based on the electromagnetic induction effect, in the inner mixing of IC-card, cause the noise source electrical level rising of the integral multiple of the carrier frequency ± 13.56MHz of use in portable wireless apparatus.This sends parasitic noise (with reference to Fig. 5) with regard to having caused for the carrier frequency of using in the portable wireless apparatus.
According to the communication mode of portable wireless apparatus, also to consider owing to send the receiving sensitivity deterioration that parasitic noise causes.In present IC-card design and manufacturing technology, it is difficult wave filter being set or changing antenna pattern at the IC-card internal circuit.
Summary of the invention
As mentioned above, the IC-card of communicating by letter with the card-reading apparatus that is assembled in portable wireless apparatus does not just have practical possibility if do not solve the problem of unwanted radiation.The present invention just provides the IC-card of structure of deterioration that a kind of employing can not cause the receiving sensitivity of radio communication functions such as portable phone and PHS, particularly when communicating, make unwanted radiation and send the IC-card that parasitic noise is decayed with the reader device that is built in portable wireless apparatus.
The purpose of this invention is to provide and a kind ofly be fit to carry out and be built in excellent IC card between the card reader/writer of portable wireless apparatus such as portable phone and PHS based on the contactless communication of electromagnetic induction effect.
Darker purpose of the present invention provides a kind of excellent IC card of deterioration of the receiving sensitivity that can not cause radio communication functions such as portable phone and PHS.
Another darker purpose of the present invention provides and a kind ofly need not change IC-card internal circuit and antenna pattern, the useless higher hamonic wave that the IC-card of just can decaying discharges, and then when carrying out contactless communication with the card reader/writer that is built in portable wireless apparatus based on the electromagnetic induction effect, the excellent IC card of the transmission parasitic noise that causes by the carrier frequency that is written into of can decaying from portable Wireless Telecom Equipment side.
The present invention is exactly with reference to the problems referred to above, utilizes specific frequency band to communicate with the card reader/writer that is assembled in the portable wireless apparatus that communicates with external wireless device, it is characterized in that possessing:
Card IC chip when it is driven by the interrogating signal that transmits by the electromagnetic induction effect, is replied answer signal that should interrogating signal;
Antenna when receiving interrogating signal, sends answer signal;
Unwanted radiation reply unit during at the work of this interrogating signal output answer signal, suppresses the higher hamonic wave that produces when above-mentioned card IC chip carries out being driven by interrogating signal.
Here, above-mentioned unwanted radiation reply unit is to constitute by covering the shielding material that higher hamonic wave produces the position.And, it is desirable to, above-mentioned unwanted radiation reply unit not only covers the higher hamonic wave of generation from IC-card, also makes the electromagnetic wave in the employed frequency of above-mentioned portable wireless apparatus can not arrive above-mentioned IC-card.
Above-mentioned shielding material preferably is made of for example wave absorber or kicker magnet, can not influence the working band zone of above-mentioned card IC chip.
In the inside of card IC chip, by the signal of the 13.56MHz that receives from card reader/writer, clocking makes internal circuit work.Be used to make the clock signal of this internal circuit work to contain the higher hamonic wave of the integral multiple of basic frequency, become the main cause of unwanted radiation.
And, during IC-card work, the carrier frequency of portable phone wireless device is written into IC-card, the carrier frequency of this portable phone wireless device and the carrier frequency 13.56MHz of IC-card by mixing, produce the transmission parasitic noise of carrier frequency ± (13.56MHz * N times of ripple) of portable wireless apparatus in IC inside.This transmission parasitic noise is discharged to the outside by the surface of chip and the antenna that is connected with chip.
The present invention for the higher hamonic wave that does not make the inner 13.56MHz that produces of IC-card discharges to the outside, shield IC-card because above-mentioned shielding material covers the surface of above-mentioned card IC chip or the one side at least in the back side with wave absorber or ferrite sheet etc.By using the material that 13.56MHz is not had influence, can keep the characteristic of IC-card.And, by the shielding IC-card, owing to can prevent that the carrier frequency of portable wireless apparatus is written into IC-card, so also can prevent to send the generation of parasitic noise in the lump.
At the input and output terminal place of above-mentioned card IC chip, synchro capacitor pattern and antenna are connected in parallel.The synchro capacitor pattern plays a role as the reverse side that has improved the contactless communication performance, the transmitting antenna of higher hamonic wave with synchronous from the electromagnetic wave of card reader/writer, also becomes the reason of unwanted radiation.
Therefore, by blocking IC chip and synchro capacitor pattern together with the shielding material shielding, the higher hamonic wave of the 13.56MHz of card IC chip and synchro capacitor pattern generating can not be discharged into the outside.And antenna also is that the transmitting antenna as higher hamonic wave plays a role, and becomes the reason of unwanted radiation.And then by antenna is shielded with shielding material, the higher hamonic wave of the 13.56MHz that card IC chip and antenna produce can not be discharged into the outside yet therefore.
The present invention so other purposes, feature and advantage will be by illustrating in greater detail clear based on embodiments of the present invention described later and accompanying drawing.
Description of drawings
Fig. 1 is expression because the unwanted radiation that card reader/writer discharges, and portable wireless apparatus is used for and the accompanying drawing of the situation that the antenna of base station communication is interfered;
Fig. 2 is expression because the unwanted radiation that IC-card discharges, and portable wireless apparatus is used for and the accompanying drawing of the situation that the antenna of base station communication is interfered;
Fig. 3 is the accompanying drawing of situation of the noise of the expression integral multiple that produces the 13.56MHz wave band that contactless IC card uses;
Fig. 4 is the accompanying drawing that the carrier frequency of expression portable wireless apparatus use is loaded into the situation of incorporating IC card;
Fig. 5 is that the carrier frequency that the expression portable wireless apparatus uses is loaded into incorporating IC card, and in the inner mixing of IC-card, the result sends the accompanying drawing of the situation of parasitic noise parasitic noise at the carrier frequency of using at portable wireless apparatus;
Fig. 6 is the accompanying drawing of the structure of the medelling ground expression IC-card relevant with one embodiment of the present invention;
Fig. 7 is the accompanying drawing of the structure of the medelling ground expression IC-card relevant with other embodiments of the present invention;
Fig. 8 is the accompanying drawing of the structure of the medelling ground expression IC-card relevant with other embodiments of the present invention;
Fig. 9 is the accompanying drawing that is illustrated in the situation of the higher hamonic wave happening part outfit shielding material on the IC-card;
Figure 10 be medelling be illustrated on the card IC chip accompanying drawing of configuration example of the IC-card of the wave filter that is equipped with the reply unwanted radiation;
Figure 11 is the accompanying drawing of the overall characteristic of expression low-pass filter 22 and the wave filter 23 that covers characteristic frequency.
Embodiment
To describe embodiments of the present invention on one side in detail with reference to accompanying drawing on one side below.
IC-card has the contactless communication interface based on electromagnetic induction principle.This non-contact communication system is by the IC-card that has memory function, the card reader/writer of carrying out read/write access at the storer of IC-card constitutes, and is formed with as the toroid winding of the IC-card side of primary coil with as the antenna of the card reader/writer side of secondary coil 1 transformer as system.And, from the card reader/writer side IC-card being transmitted electric power and information by same electromagnetic induction effect, the IC-card side can drive by the electric power that is provided and at replying from the interrogating signal of card reader/writer side.
In the present embodiment, portable wireless apparatus such as portable phone and PHS is equipped with card reader/writer, this portable wireless apparatus with the state of base station communication under, the card reader/writer of device interior is carried out contactless communication based on electromagnetic induction effect and outside contactless IC card.For example, utilize portable wireless apparatus self radio communication function, can carry out charge processing service at the value information of IC-card storage.
Because portable equipment generally all adopts miniaturization structure, portable wireless apparatus be used for and the antenna of base station communication and, being assembled in the antenna of the card reader/writer in the equipment actual is adjacent installation.
On the one hand, IC-card is by the signal of the 13.56MHz that receives from card reader/writer, and clocking makes internal circuit work.Be used to make the clock signal of this internal circuit work to become the noise source of the integral multiple of 13.56MHz.In case portable telephone uses the 800MHz wave band, then the 60-66 of 13.56MHz higher hamonic wave doubly will be disturbed communicating by letter of portable telephone and base station, and the receiving sensitivity of portable telephone also can deterioration.
And, when IC-card is worked, in case the carrier frequency of portable phone wireless device is loaded in the IC-card, the carrier frequency of this portable phone wireless device and the carrier frequency 13.56MHz of IC-card by mixing, produce the transmission parasitic noise of carrier frequency ± (13.56MHz * N times of ripple) of portable wireless apparatus in IC inside.This transmission parasitic noise is discharged to the outside by the surface of chip and the antenna that is connected with chip.
Therefore, in the present embodiment,, wait with wave absorber or ferrite sheet and shield IC-card for the higher hamonic wave that does not make the inner 13.56MHz that produces of IC-card discharges to the outside.By using the material that 13.56MHz is not had influence, can keep the characteristic of IC-card.And, by the shielding IC-card, owing to can prevent that the carrier frequency of portable wireless apparatus is loaded into IC-card, so also can prevent to send the generation of parasitic noise in the lump.
In Fig. 6, represented to medelling the structure of the IC-card relevant with one embodiment of the present invention.In illustrated embodiment, IC-card 10 is equipped with card IC chip 12 in a corner of slim approximate rectangular substrate 11, and then the coil antenna 13 that is connected with the input and output terminal of card IC chip 12 is laid along the edge of substrate 11.
The signal that card IC chip 12 passes through from the 13.56MHz of card reader/writer reception, clocking makes internal circuit work.Be used to make the clock signal of this internal circuit work to contain the higher hamonic wave of the integral multiple of basic frequency, become the main cause that produces unwanted radiation.
The shielding material 14 that constitutes by kicker magnets such as wave absorber or ferrites that has covered card IC chip 12 is equipped with in embodiment shown in Figure 6, on the substrate 11.This shielding material 14 does not discharge the higher hamonic wave of the 13.56MHz that is created in card IC chip 12 to the outside.On the other hand, adopt the 13.56MHz that the contactless ic card is used not have the structure of influence, kept the original characteristic of contactless ic cartoon letters.And, by will block IC chip 12 and extraneous shielding by shielding material 14, be loaded in the card IC chip owing to can prevent to be built-in with the carrier frequency of the portable wireless apparatus (not having diagram) of card reader/writer, so also can prevent to send the generation of parasitic noise in the lump.
In addition, though shielding material 14 only is provided in the surface of substrate 11 or the one side in the back side just produces effect, it is desirable to be provided in the surface and the two sides, the back side of substrate 11, fully shield card IC chip 12.
And, represented to Fig. 7 medelling the structure of the IC-card relevant with other embodiments of the present invention.IC-card 10, for example and do not have to carry out between the illustrated card reader/writer that is built in portable wireless apparatus a contactless communication based on the electromagnetic induction effect.
In illustrated embodiment, IC-card 10 is equipped with card IC chip 12 in a corner of slim approximate rectangular substrate 11, and then the coil antenna 13 that is connected with the input and output terminal of card IC chip 12 is laid along the edge of substrate 11.And at the input and output terminal place of card IC chip 12, synchro capacitor pattern 15 is connected in parallel with antenna 13.
Synchro capacitor pattern 15 has the effect of the resonance frequency that determines coil antenna 13.In this case, constitute resonator in IC-card 10 sides, antenna 13 can receive magnetic field expeditiously.
Card IC chip 12, by the signal of the 13.56MHz that receives from card reader/writer, clocking makes internal circuit work.Be used to make the clock signal of this internal circuit work to contain the higher hamonic wave of the integral multiple of basic frequency, become the main cause of unwanted radiation.And then synchro capacitor pattern 15 plays a role as the reverse side that has improved the contactless communication performance, the transmitting antenna of higher hamonic wave with synchronous from the electromagnetic wave of card reader/writer (not having diagram), also becomes the reason of unwanted radiation.
Therefore, the shielding material 14 that constitutes by kicker magnets such as wave absorber or ferrites that has covered card IC chip 12 and synchro capacitor pattern 15 is equipped with in embodiment shown in Figure 7, on the substrate 11.This shielding material 14 does not discharge the higher hamonic wave of the 13.56MHz that is created in card IC chip 12 or synchro capacitor pattern 15 to the outside.On the other hand, adopt the 13.56MHz that the contactless ic card is used not have the structure of influence, kept the original characteristic of contactless ic cartoon letters.And, by will block IC chip 12 and extraneous shielding by shielding material 14, be written into card IC chip 12 owing to can prevent to be built-in with the carrier frequency of the portable wireless apparatus (not having diagram) of card reader/writer, so also can prevent to send the generation of parasitic noise in the lump.
In addition, though shielding material 14 only is provided in the surface of substrate 11 or the one side in the back side just produces effect, it is desirable to be provided in the surface and the two sides, the back side of substrate 11, fully shield card IC chip 12 and synchro capacitor pattern 15.
And, represented to Fig. 8 medelling the structure of the IC-card relevant with other embodiments of the present invention.In illustrated embodiment, IC-card 10 is equipped with card IC chip 12 in a corner of slim approximate rectangular substrate 11, and then the coil antenna 13 that is connected with the input and output terminal of card IC chip 12 is laid along the edge of substrate 11.And at the input and output terminal place of card IC chip 12, synchro capacitor pattern 15 is connected in parallel with antenna 13.And IC-card 10 for example can be built in does not have illustrated portable wireless apparatus to use.
Card IC chip 12, by the signal of the 13.56MHz that receives from card reader/writer, clocking makes internal circuit work.Be used to make the clock signal of this internal circuit work to contain the higher hamonic wave of the integral multiple of basic frequency, become the main cause of unwanted radiation.And synchro capacitor pattern 15 is synchronous with the electromagnetic wave of card reader/writer (not having diagram), plays a role as the reverse side that has improved the contactless communication performance, the transmitting antenna of higher hamonic wave, also becomes the reason of unwanted radiation.And then antenna 13 also plays a role as the transmitting antenna of higher hamonic wave, also becomes the reason of unwanted radiation.
Therefore, the shielding material 14 that constitutes by kicker magnets such as wave absorber or ferrites of the front that covered substrate 11 is equipped with in embodiment shown in Figure 8.This shielding material 14 does not discharge the higher hamonic wave of the 13.56MHz that is created in card IC chip 12 and synchro capacitor pattern 15, antenna 13 to the outside.On the other hand, adopt the 13.56MHz that the contactless ic card is used not have the structure of influence, the original characteristic of contactless ic cartoon letters has obtained keeping.And, by will block IC chip 12 and extraneous shielding by shielding material 14, be written into card IC chip 12 owing to can prevent to be built-in with the carrier frequency of the portable wireless apparatus (not having diagram) of card reader/writer, so also can prevent to send the generation of parasitic noise in the lump.
In addition, though shielding material 14 only is provided in the surface of substrate 11 or the one side in the back side just produces effect, it is desirable to be provided in the surface and the two sides, the back side of substrate 11, fully shield card IC chip 12, synchro capacitor pattern 15 and antenna 13.
In Fig. 9, represented to produce the cross section structure of the IC-card 10 of position equipment shielding material 14 in higher hamonic wave.As what the figure shows, IC-card 10 self in the equipment card IC chip 12, has also been installed the figure of antenna 13 on the substrate 11 that is made of polyimide film.And the two sides of substrate 11 all is formed with the film of Copper Foil.And the both sides of these parts are by 2 pieces of stainless reinforcement sheet 31A and 31B protection, and strengthening material 31A～31B inside is filled with the sealing resin 33 of the epoxy resin that added filling material etc.And then the outside of these parts covers neat appearance by extraneous adornment 32A and 32B.
And in the example that Fig. 9 represents, shielding material 14 is inserted between the strengthening material 31 and extraneous adornment 32 after resin-sealed, but also can be at strengthening material 31 inner stacks shielding materials 14.Perhaps also shielding material 14 can be attached to the surface of extraneous adornment 32.
In present IC-card design and manufacturing technology, resemble illustrated at the internal circuit of IC-card wave filter to be set be difficult, certainly, wave filter is set by internal circuit at IC-card, can solve the problem of unwanted radiation.Be illustrated in to Figure 10 medelling and be equipped with the configuration example of unwanted radiation reply on the card IC chip with the IC-card of wave filter.
Card IC module 12 adopts the structure of using MOS technology.And, each terminal 12A and 12B place in card IC module 12, the wave filter 23A and the 23B that are used for suppressing the low-pass filter 22A and the 22B of unwanted radiation and are used for covering the higher hamonic wave of characteristic frequency are connected in series, and being situated between is connected with coil antenna 13 by these wave filters 22,23.And antenna 13 and synchro capacitor pattern 15 are connected in parallel.
Here being used for covering the wave filter 23 of the higher hamonic wave of characteristic frequency, as shown in the figure, is that the parallel circuit by coil L and capacitor C constitutes.And, the constant of the reactance L by changing coil and the static capacity C of capacitor, just only decay be included in the characteristic frequency wave band from the higher hamonic wave of blocking IC chip 12.
The relation of frequency that should decay and reactance L and static capacity C is as follows.
Formula 1
f＝1/2πLC
For example, when in the portable telephone that reads IC-card 10 based on the electromagnetic induction effect by contactless communication that is equipped with Card Reader/write card function, using 800MHz wave band and base station communication, be necessary being that the center makes the higher hamonic wave decay about 850MHz.In this case, can allow L=18[nH], C=2[pF].
Perhaps, when in the PHS that reads IC-card 10 based on the electromagnetic induction effect by contactless communication that is equipped with Card Reader/write card function, using 1.95GHz wave band and base station communication, be necessary being that the center makes the higher hamonic wave decay about 1.95GHz.In this case, can allow L=3.3[nH], C=2[pF].
Figure 11 has represented low-pass filter 22 and has covered the overall characteristic of the wave filter 23 of characteristic frequency.As can be seen from this figure, by low-pass filter 22 and antenna 13 are connected in series, unwanted radiation can be suppressed to the level of electric wave law regulation.And then, cover the wave filter 23 of characteristic frequency by being connected in parallel, can limit the also higher hamonic wave of attenuation of specific frequencies.
Detailed explanation has been carried out to the present invention on one side with reference to specific embodiment in top one side.But in the scope that does not break away from main idea of the present invention, those skilled in the art certainly obtain the modification of this embodiment and substitute.That is to say,, should not be interpreted as the present invention and be confined to the content that this instructions is put down in writing though the present invention discloses mode as an example.Should partly judge main idea of the present invention with reference to claims.
As mentioned above, the present invention can provide a kind of excellent IC card that is fit to carry out based on the electromagnetic induction effect with the card reader/writer that is built in portable wireless apparatus such as portable phone and PHS contactless communication.And the present invention can also provide the excellent IC card of structure of the receiving sensitivity deterioration of the radio communication function that a kind of employing can not cause portable phone and PHS etc.
And, the present invention can also provide a kind of need not change IC-card internal circuit and antenna pattern, the useless higher hamonic wave that the IC-card of just can decaying discharges, and then and be built between the card reader/writer of portable wireless apparatus when carrying out contactless communication the excellent IC card of the transmission parasitic noise that causes by the carrier frequency that is written into of can decaying from portable Wireless Telecom Equipment side based on the electromagnetic induction effect.
The present invention writes the card function with the Card Reader of presence and has become reality by suppressing the unwanted radiation that IC-card discharges.
Claims (9)
1. IC-card, it utilizes specific frequency band, can communicate with the reader device that is assembled in the portable wireless apparatus that communicates with external wireless device, it is characterized in that possessing:
Card IC chip when it is driven by the interrogating signal that transmits by the electromagnetic induction effect, is replied the answer signal corresponding to this interrogating signal;
Antenna when receiving interrogating signal, sends answer signal;
Unwanted radiation reply unit during corresponding to the work of this interrogating signal output answer signal, suppresses the higher hamonic wave that produces when above-mentioned card IC chip carries out being driven by interrogating signal.
2. IC-card as claimed in claim 1 is characterized in that,
Above-mentioned unwanted radiation reply unit is to be made of the shielding material that covers higher hamonic wave generation position.
3. IC-card as claimed in claim 1 is characterized in that,
Above-mentioned unwanted radiation reply unit makes the electromagnetic wave of the employed frequency of above-mentioned portable wireless apparatus can not arrive above-mentioned IC-card.
4. IC-card as claimed in claim 2 is characterized in that,
Above-mentioned shielding material is made of wave absorber or kicker magnet.
5. IC-card as claimed in claim 2 is characterized in that,
Above-mentioned shielding material does not exert an influence to the working band territory of above-mentioned card IC chip.
6. IC-card as claimed in claim 2 is characterized in that,
Above-mentioned shielding material covers the surface of above-mentioned card IC chip or the one side at least in the back side.
7. IC-card as claimed in claim 2 is characterized in that,
Input and output terminal place at above-mentioned card IC chip is connected in parallel with capacitor pattern and antenna synchronously.
8. IC-card as claimed in claim 7 is characterized in that,
Above-mentioned shielding material covers above-mentioned card IC chip and the above-mentioned synchronous one side at least of using the surface or the back side of capacitor pattern.
9. IC-card as claimed in claim 2 is characterized in that,
Above-mentioned shielding material covers the one side at least at the surface or the back side of above-mentioned card IC chip and above-mentioned antenna.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP138700/2003 | 2003-05-16 | ||
| JP138700/03 | 2003-05-16 | ||
| JP2003138700A JP2004341895A (en) | 2003-05-16 | 2003-05-16 | Ic card |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1551046A true CN1551046A (en) | 2004-12-01 |
| CN1324523C CN1324523C (en) | 2007-07-04 |
Family
ID=33527996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100447524A Expired - Fee Related CN1324523C (en) | 2003-05-16 | 2004-05-17 | IC card |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004341895A (en) |
| CN (1) | CN1324523C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105654172A (en) * | 2014-12-08 | 2016-06-08 | 北京数码视讯科技股份有限公司 | IC card and IC card making method |
| CN109214220A (en) * | 2010-08-11 | 2019-01-15 | 意法半导体股份有限公司 | Method for the communication of the security system of at least one IC integrated circuit, safety integrated circuit card and safe wireless |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007015406A1 (en) * | 2005-08-02 | 2007-02-08 | Matsushita Electric Industrial Co., Ltd. | Antenna unit for noncontact communication and mobile communication device provided with such antenna unit |
| JP4403431B2 (en) | 2007-06-14 | 2010-01-27 | ソニー株式会社 | Communication system and communication apparatus |
| JP5083122B2 (en) * | 2008-08-26 | 2012-11-28 | ソニー株式会社 | High frequency coupler and electric field signal radiating element |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS625367U (en) * | 1985-03-16 | 1987-01-13 | ||
| US5333100A (en) * | 1992-06-29 | 1994-07-26 | Itt Corporation | Data card perimeter shield |
| JPH09331185A (en) * | 1996-06-10 | 1997-12-22 | Murata Mfg Co Ltd | Noise-limited electronic component |
| CN2304981Y (en) * | 1997-07-18 | 1999-01-20 | 深圳市先声科技发展有限公司 | Electromagnetic radiation resistant card |
| TW383952U (en) * | 1997-12-05 | 2000-03-01 | Hon Hai Prec Ind Co Ltd | Slot connector |
| FR2784768A1 (en) * | 1998-10-16 | 2000-04-21 | Schlumberger Ind Sa | Protecting integrated circuits on cards from the effects of electromagnetic radiation by using silica doped with Phosphorus or Boron or an irregular surface or metallic screening |
| CN2439718Y (en) * | 2000-08-22 | 2001-07-18 | 余景爱 | Electromagnetic neutralizing card |
| CN1486474A (en) * | 2001-01-12 | 2004-03-31 | 康贤秀 | Contactless electronic card |
-
2003
- 2003-05-16 JP JP2003138700A patent/JP2004341895A/en active Pending
-
2004
- 2004-05-17 CN CNB2004100447524A patent/CN1324523C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109214220A (en) * | 2010-08-11 | 2019-01-15 | 意法半导体股份有限公司 | Method for the communication of the security system of at least one IC integrated circuit, safety integrated circuit card and safe wireless |
| CN109214220B (en) * | 2010-08-11 | 2022-06-24 | 意法半导体股份有限公司 | Security system, secure integrated circuit card and method of secure wireless communication |
| CN105654172A (en) * | 2014-12-08 | 2016-06-08 | 北京数码视讯科技股份有限公司 | IC card and IC card making method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1324523C (en) | 2007-07-04 |
| JP2004341895A (en) | 2004-12-02 |
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