CN102768725B - A kind of radio-frequency unit and communication means - Google Patents
A kind of radio-frequency unit and communication means Download PDFInfo
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- CN102768725B CN102768725B CN201110112459.7A CN201110112459A CN102768725B CN 102768725 B CN102768725 B CN 102768725B CN 201110112459 A CN201110112459 A CN 201110112459A CN 102768725 B CN102768725 B CN 102768725B
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Abstract
The present invention relates to a kind of radio-frequency unit controlling radio frequency communication distance, and based on the communication means of this radio-frequency unit.Described radio-frequency unit comprises rf data transceiver module, and it also comprises: magnetic signal receiver module, for receiving the first magnetic signal that external radio frequency terminal sends; Magnetic signal transmitter module, for generation of and launch the second magnetic signal; Described radio-frequency unit controls the communication distance with described external radio frequency terminal by described magnetic signal, and described radio-frequency unit carries out message exchange by described rf data transceiver module and described external radio frequency terminal.Described radio-frequency unit realizes two-way low frequency distance controlling by low-frequency magnetic Signal reception and transmitter module, overcome the radio-frequency unit adopting one-way distance to control well and in use easily occur that communication distance is by the problem zoomed out, efficiently avoid distance by the risk brought after zooming out, improve experience and the impression of user.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of radio-frequency unit utilizing the two-way magnetic communication of low frequency to carry out communication distance control, and based on the communication means of this radio-frequency unit.
Background technology
Along with the development of wireless communication technology, mobile communication terminal is commonly used as the indispensable daily communication exchange instrument of people.Simultaneously for realizing the user identification module SubscriberIdentityModule of identity verify function, be called for short SIM card, the important component part as mobile communication terminal is also widely used in moving communicating field.Under the expulsive force that smart card techniques constantly improves, in order to meet ever-increasing mobile phone users demand for experience, by increasing various intelligent use functional module in common SIM cards inside, SIM card is made not only to have basic telecommunications functions, many services can also be possessed in the novel capabilities of popular daily life, can meet the market demand of constantly change well, the radio-frequency SIM card based on low frequency distance controlling function is exactly one of them.
The above-mentioned radio-frequency SIM card based on low frequency distance controlling function is a kind of special SIM card with low frequency magnetic field communication and the combination of RF data communications function, low channel and radio-frequency channel is bound.In some certain applications of described radio-frequency SIM card, closely payment class as public transit system electronic bill is applied, mispronounce card for preventing and misread card operation and cause unnecessary economic loss, this radio-frequency SIM card and corresponding radio-frequency card reader device must be limited within the scope of an effective and controlled communication distance, to ensure to read and write the safety of both sides' transaction and reliable.
Therefore, wireless communication distance controls the technological difficulties needing key breakthrough with regard to becoming the above-mentioned radio-frequency SIM card based on low frequency distance controlling function.Those skilled in the art invent a kind of radio-frequency SIM card utilizing the mode detecting low-frequency magnetic field signal intensity to realize communication distance effectively to control, and this technology is at the inner integrated low-frequency magnetic induction module of radio-frequency SIM card and preset corresponding threshold level.When entering the magnetic field that radio-frequency card reader produces, after the intensity that this radio-frequency SIM card detects the low-frequency magnetic field signal received is more than or equal to predetermined threshold value, this radio-frequency SIM card is activated, show that it enters safe transaction area of swiping the card, this radio-frequency SIM card starts radio-frequency channel immediately, and responds the relevant verify data of radio-frequency card reader by radio-frequency channel.
In above-mentioned technology, this radio-frequency SIM card has unidirectional low frequency reception passage, utilize low frequency signal to the good penetration of shelter and magnetic field intensity with the rule of distance in monotonic decay, effectively can reduce the otherness that various mobile terminal brings because structure is different with material affects.The low frequency magnetic field threshold value of all mobile terminals can be set to identical by this radio-frequency SIM card, whether whether the low frequency magnetic field intensity received by detecting it meet the requirements and judge to access distance and meet the demands, whether should start radio-frequency channel and to carry out concluding the business a series of subsequent operation such as confirmation of entity, thus the transaction distance controlling realized without calibration, make the unification of the legitimate correspondence of different mobile terminal and radio-frequency card reader distance, be stabilized in a limited and controlled interval range.
But above-mentioned radio-frequency SIM card also also exists certain shortcoming.In the above-mentioned technical scheme mentioned, this radio-frequency SIM card inside is only integrated with low-frequency magnetic induction receiver module, the reception that described radio-frequency SIM card can only be unidirectional and the low frequency alternating magnetic field signal that detection is provided by radio-frequency card reader.And the response of this radio-frequency SIM card radio frequency card reader low channel is completed by radio-frequency channel, this process is mainly used in the transmission of verify data and the binding of transaction entity.This kind of mode easily produces following problem, after malice distorts the low frequency propelling movement power or the sensitivity of increase radio frequency reception increasing radio-frequency card reader, likely cause the effective communication distance of both sides to become large, thus directly have influence on transaction process and the experience of user.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of radio-frequency unit with the two-way magnetic communication function of low frequency, making the mobile terminal of various application this kind of radio-frequency unit can complete data interaction safely and reliably within the scope of the communication distance of regulation, preventing the communication distance of communicating pair from being caused potential safety hazard by widening.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
A kind of radio-frequency unit, comprises rf data transceiver module, it is characterized in that, also comprise:
Magnetic signal receiver module, for receiving the first magnetic signal that external radio frequency terminal sends;
Magnetic signal transmitter module, for generation of and launch the second magnetic signal;
Described radio-frequency unit controls the communication distance with described external radio frequency terminal by described magnetic signal, and described radio-frequency unit carries out message exchange by described rf data transceiver module and described external radio frequency terminal.
Further, described radio-frequency unit judges the radio frequency communication distance between described external radio frequency terminal and described radio-frequency unit according to the first magnetic signal received, and sends radio frequency communication distance confirmation by the second magnetic signal to described external radio frequency terminal.
Further, described first magnetic signal carries the identification information of the external radio frequency terminal of launching this first magnetic signal;
Described second magnetic signal carries the identification information of described radio-frequency unit.
Further, according to the first magnetic signal received, described radio-frequency unit judges that between described external radio frequency terminal distance is whether in the effective communication distance preset.
Further, described radio-frequency unit also comprises master controller, and described magnetic signal receiver module is used for the electric signal that described first magnetic signal converts to send to described master controller; Described master controller is used for the electric signal converted to according to the first magnetic signal and the threshold value preset, and judges distance between described radio-frequency unit and described external radio frequency terminal whether in the effective communication distance preset.
Further, described external radio frequency terminal is radio-frequency card reader.
Further, described radio-frequency unit also comprises pickup coil, and described pickup coil is for receiving the first magnetic signal and being converted into electric signal and sending to described magnetic signal receiver module; Described pickup coil is also for launching described second magnetic signal that described magnetic signal transmitter module produces.
Further, described radio-frequency unit also comprises master controller, information entrained by the second magnetic signal that described master controller is launched for generation of described magnetic signal transmitter module, the information that described magnetic signal transmitter module produces according to described master controller, produces and launches the second magnetic signal.
Further, described radio-frequency unit also comprises master controller and pickup coil;
Described master controller is connected with described rf data transceiver module, magnetic signal receiver module and magnetic signal transmitter module respectively; Described pickup coil is connected with described magnetic signal receiver module and magnetic signal transmitter module respectively;
This information for generation of the information entrained by described second magnetic signal, and is sent to described magnetic signal transmitter module by described master controller; Described master controller, also for the electric signal changed according to the first magnetic signal and the threshold value preset, judges distance between described radio-frequency unit and described external radio frequency terminal whether in the effective communication distance preset;
Described rf data transceiver module, for carrying out the transmitting-receiving of rf data between described radio-frequency unit and described external radio frequency terminal;
The electric signal of described magnetic signal receiver module also for being converted to by described first magnetic signal sends to described master controller;
Described magnetic signal transmitter module, according to the information that described master controller produces, produces and launches the second magnetic signal;
Described pickup coil is for receiving the first magnetic signal and being converted into electric signal and sending to described magnetic signal receiver module; Described pickup coil is also for launching described second magnetic signal that described magnetic signal transmitter module produces.
Further, described radio-frequency unit is radio-frequency SIM card.
Further, described magnetic signal receiver module comprises the amplifying circuit, filtering circuit and the decoding circuit that connect in turn, and described amplifying circuit is connected with described pickup coil, and described decoding circuit is connected with described master controller;
Described amplifying circuit, amplifies for the electric signal converted to the first magnetic signal received from described pickup coil;
Described filtering circuit, for carrying out filtering to the electric signal after amplification, suppresses the Noise and Interference outside useful signal frequency band range;
The coded system that described decoding circuit adopts according to the radio-frequency unit launching described first magnetic signal is decoded to filtered signal, and sends to described master controller.
Further, described magnetic signal receiver module also comprises the demodulator circuit be arranged between filtering circuit and decoding circuit; The modulation system that described demodulator circuit is used for adopting according to described external radio frequency terminal carries out demodulation to filtered signal, and sends to described decoding circuit.
Further, described magnetic signal receiver module comprises the amplifying circuit and filtering circuit that connect in turn, and described amplifying circuit is connected with described pickup coil, and described filtering circuit is connected with described master controller;
Described amplifying circuit, amplifies for the electric signal converted to the first magnetic signal received from described pickup coil;
Described filtering circuit, for carrying out filtering to the electric signal after amplification, suppresses the Noise and Interference outside useful signal frequency band range;
Described master controller, the coded system also for adopting according to the radio-frequency unit launching described first magnetic signal is decoded to filtered signal.
Further, described magnetic signal receiver module also comprises the demodulator circuit be arranged between filtering circuit and master controller; The modulation system that described demodulator circuit is used for adopting according to described external radio frequency terminal carries out demodulation to filtered signal, and sends to described master controller.
Further, described magnetic signal transmitter module comprises the coding circuit, D/A change-over circuit and the driving circuit that connect in turn, and described coding circuit is connected with described master controller, and described driving circuit is connected with described pickup coil;
Described master controller needs the low frequency magnetic field information of launching for generation of described radio-frequency unit, described Magnetic Field is digital baseband signal;
Described coding circuit is used for encoding to the digital baseband signal that described master controller provides;
Described D/A change-over circuit is used for the digital signal after by coding and is converted to low-frequency analog signal;
Described driving circuit for amplifying described low-frequency analog signal, and drives described pickup coil to produce low frequency alternating magnetic field.
Further, described magnetic signal transmitter module also comprises the modulation circuit be arranged between described coding circuit and D/A change-over circuit; Described modulation circuit is used for the digital baseband signal after to coding and modulates, and sends to described D/A change-over circuit.
Further, described magnetic signal transmitter module comprises the D/A change-over circuit and driving circuit that connect in turn, and described D/A change-over circuit is connected with described master controller, and described driving circuit is connected with described pickup coil;
Described master controller for generation of low frequency coded data, and sends to described D/A change-over circuit;
Described D/A change-over circuit is used for described low frequency coded data to be converted to low-frequency analog signal;
Described driving circuit for amplifying described low-frequency analog signal, and drives described pickup coil to produce low frequency alternating magnetic field.
Further, described magnetic signal transmitter module also comprises the modulation circuit be arranged between described master controller and D/A change-over circuit; Described modulation circuit is used for modulating described low frequency coded data, and sends to described D/A change-over circuit; The modulation system of described modulation circuit adopts the digital modulation mode without changes in amplitude; The modulation system of described modulation circuit is on-off keying method, frequency shift keying, binary phase shift keying method or Quadrature Phase Shift Keying method; The waveform of the carrier signal that described modulation circuit adopts is sine wave, triangular wave or square wave.
Further, described pickup coil is the multi-coil of low frequency reception passage, low frequencies passage point, or the unicoil share for low frequency reception passage, low frequencies passage.
Further, when the unicoil that described pickup coil adopts low frequency reception passage, low frequencies passage share, described unicoil and be provided with simulating signal switch between described low-frequency magnetic signal receiving module and low-frequency magnetic signal emission module, described simulating signal switch is also connected with described master controller; Described master controller provides switch controlling signal to described simulating signal switch, to control low-frequency magnetic signal receiving module or the connection between low-frequency magnetic signal emission module and described unicoil described in described simulating signal switching over.
Further, the highest predetermined transmitting-receiving frequency of operation of described magnetic signal receiver module and magnetic signal transmitter module is in tonal range, very low frequency (VLF) frequency range or low frequency frequency range.
Further, the frequency range of described tonal range is 300Hz to 3kHz; The frequency range of described very low frequency (VLF) frequency range is 3kHz to 30kHz; The frequency range of described low frequency frequency range is 30kHz to 300kHz.
Further, described magnetic signal receiver module and magnetic signal transmitter module carry out the two-way communication of low frequency link by TDD mode or mode of frequency division duplexing and the radio-frequency unit of launching the first magnetic signal; Further, the frequency of operation of described magnetic signal receiver module and the frequency of operation of described magnetic signal transmitter module are less than the highest predetermined transmitting-receiving frequency of operation.
Further, described rf data transceiver module comprises the radio-frequency (RF) transceiver, impedance matching network and the radio-frequency antenna that connect in turn, and described radio-frequency (RF) transceiver is also connected with described master controller.
Further, described radio-frequency (RF) transceiver adopts radio communication mode, and frequency of operation is in very high frequency(VHF) VHF frequency range, superfrequency uhf band or ultrahigh frequency SHF frequency range.
Further, described radio-frequency (RF) transceiver frequency of operation is 433MHz, 915MHz, 2.4GHz or 5.8GHz.
Further, described impedance matching network is for guaranteeing radiofrequency signal unreflected maximum power transfer on link of launching or receiving.
Present invention also offers a kind of communication means, comprising:
The mobile communication terminal being equipped with the radio-frequency unit as above described in any one receives the first magnetic signal that external radio frequency terminal sends, and judges communication distance between described radio-frequency unit and external radio frequency terminal whether in the scope of preset value;
When communication distance is in preset range, described radio-frequency unit sends low frequency answer signal to described external radio frequency terminal, and and described external radio frequency eventually between carry out data communication by radio frequency;
During aforementioned radio communication, the continual received RF card reader of described radio-frequency unit sends the first magnetic signal, and judges communication distance whether in the scope of preset value, if when communication distance is not in preset range, then stops aforementioned RF data communications.
Further, after the communication between the described mobile communication terminal of equipment and described external radio frequency terminal completes, described radio-frequency unit enters dormant state and waits for and communicates next time.
Further, when communication distance is beyond preset range, described radio-frequency unit continues to attempt to receive the first magnetic signal that external radio frequency terminal sends in the first Preset Time, and judges communication distance between described radio-frequency unit and external radio frequency terminal whether in the scope of preset value.
Further, when described radio-frequency unit does not receive the first magnetic signal in the first Preset Time, then the mobile communication terminal equipping described radio-frequency unit disconnects the connection with described external radio frequency terminal, and described radio-frequency unit enters dormant state.
Further, when described radio-frequency unit detects that communication distance is in preset range, described radio-frequency unit attempts the rf data receiving the transmission of external radio frequency terminal in the second Preset Time, if receive the rf data that external radio frequency terminal sends in the second Preset Time, then and described external radio frequency eventually between carry out RF data communications, if do not receive the rf data that external radio frequency terminal sends in the second Preset Time, the mobile communication terminal then equipping described radio-frequency unit disconnects the connection with described external radio frequency terminal, described radio-frequency unit enters dormant state.
Radio-frequency unit provided by the present invention, is applicable to wireless near field communication, comprises public transport electronic bill, gate inhibition identifies the application scenario that control and stored value card mobile payment etc. are different.
Compared with the existing technology comparatively, beneficial effect of the present invention is:
Two-way low frequency distance controlling is realized by magnetic signal receiver module and magnetic signal transmitter module, the effective communication distance installing the mobile communication terminal of described radio-frequency unit and the external radio frequency terminal of the described radio-frequency unit of corresponding support accurately can be controlled at one limited and reasonably in interval, overcome well and adopt the radio-frequency unit of unidirectional low frequency distance controlling in use easily to occur concluding the business distance by the problem maliciously widened, effectively prevent the risk that customer transaction data may be intercepted and captured by the external world, improve experience and the impression of user.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of radio-frequency unit provided by the invention;
Fig. 2 is the structured flowchart of radio-frequency SIM card provided by the present invention;
Fig. 3 is the inner concrete structure block diagram about magnetic signal transmitter module, magnetic signal receiver module and rf data transceiver module of the radio-frequency SIM card shown in Fig. 2;
Fig. 4 is a kind of planar structure schematic diagram of radio-frequency SIM card provided by the present invention;
Fig. 5 be radio-frequency SIM card provided by the present invention when low frequency dispatch coil shares, adopt simulating signal switch to carry out the example principles block diagram of low frequency transceiver channel switching;
Fig. 6 is an application scenarios schematic diagram of radio-frequency SIM card provided by the present invention;
Fig. 7 is the workflow diagram of a concrete case study on implementation of radio-frequency SIM card provided by the present invention.In accompanying drawing, the list of parts representated by each label is as follows:
10, radio-frequency unit,
100, radio-frequency SIM card,
101, master controller,
102, rf data transceiver module,
1021, radio-frequency antenna, 1022, impedance matching network, 1023, radio-frequency (RF) transceiver,
103, pickup coil,
104, magnetic signal transmitter module,
1041, driving circuit, 1042, D/A change-over circuit, 1043, modulation circuit, 1044, coding circuit,
105, magnetic signal receiver module,
1051, amplifying circuit, 1052, filtering circuit, 1053, demodulator circuit, 1054, decoding circuit
106, SIM card microcontroller,
107, SIM card interface module,
201, circuit function module region, 202, pickup coil region,
301, simulating signal switch, 302, pickup coil,
401, mobile communication terminal, 402, radio-frequency card reader, 403, background server.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, radio-frequency unit 10 provided by the invention comprises rf data transceiver module 102, also comprises: magnetic signal receiver module 105, for receiving the first magnetic signal that external radio frequency terminal sends; Magnetic signal transmitter module 104, for generation of and launch the second magnetic signal; Described radio-frequency unit 10 controls the communication distance with described external radio frequency terminal by described magnetic signal, and described radio-frequency unit carries out message exchange by described rf data transceiver module 104 with described external radio frequency terminal.Wherein external radio frequency terminal can be radio-frequency card reader.Radio-frequency unit 10 of the present invention can be a kind of radio-frequency SIM card, specifically describes further below to described radio-frequency SIM card.
As shown in Figure 2, the radio-frequency SIM card 100 with low frequency bi-directional communication function provided by the present invention, comprises master controller 101, rf data transceiver module 102, pickup coil 103, magnetic signal transmitter module 104, magnetic signal receiver module 105, SIM card microcontroller 106 and SIM card interface module 107.Wherein, described magnetic signal receiver module 105 receives the first magnetic signal by described pickup coil 103 and sends described master controller 101 to; Magnetic signal transmitter module 104 for generation of and launch the second magnetic signal by described pickup coil 103; Master controller 101 for judging the radio frequency communication distance between described radio-frequency SIM card 100 and the radio-frequency unit launching this first magnetic signal according to the first magnetic signal of reception, and passes through the radio-frequency unit transmission radio frequency communication distance confirmation of the second magnetic signal to transmitting first magnetic signal.
Wherein, described first magnetic signal carries the identification information of the radio-frequency card reader launching this first magnetic signal; Described second magnetic signal carries the identification information of described radio-frequency SIM card 100.Described magnetic signal receiver module 105 and magnetic signal transmitter module 104 carry out the two-way communication of low frequency link by TDD mode or mode of frequency division duplexing and the radio-frequency card reader of launching the first magnetic signal.
As shown in Figure 3, described magnetic signal receiver module 105 is made up of amplifying circuit 1051, filtering circuit 1052, demodulator circuit 1053 and decoding circuit 1054, and is linked in sequence successively; Described amplifying circuit 1051 is also connected with pickup coil 103, and decoding circuit 1054 is also connected with master controller 101.Described demodulator circuit 1053 is nonessential assembly, and when the low-frequency magnetic signal received is unmodulated baseband signal, the direct and described decoding circuit 1054 of described filtering circuit 1052 is connected.
The first magnetic signal carrying this radio-frequency card reader id information that extraneous radio frequency card reader produces is responded to and received to described pickup coil 103, and be converted to electric signal; Described amplifying circuit 1051 carries out amplification process to the electric signal of this reflection change of magnetic field strength, and the amplitude of promotion signal is also adjusted in predetermined magnitude range; Described filtering circuit 1052 carries out filtering process to the electric signal after amplification, suppresses the Noise and Interference outside useful signal frequency band range; The modulation system that described demodulator circuit 1053 adopts according to radio-frequency card reader carries out corresponding demodulation process to filtered signal; The coded system that described decoding circuit 1054 adopts according to radio-frequency card reader to be decoded process accordingly to the signal after demodulation.Finally, master controller 101 is further processed the digital baseband signal obtained by above signal flow, the size of the magnetic field intensity sensed is judged according to signal amplitude, thus determine that radio-frequency card reader arrives the one-way communication distance of the mobile communication terminal equipping described radio-frequency SIM card 100 whether in preset range, obtain the radio-frequency card reader id information carried in baseband signal simultaneously, and determine whether trigger next step action of execution.
Described amplifying circuit 1051 can be single-ended amplifying circuit form or differential amplifier circuit form or fully differential amplifying circuit form, and its gain can require carry out flexible according to communication distance; Described filtering circuit 1052 adopts analog bandpass filtering device structure, it can be passive RC filter, also can for the active filter be made up of operational amplifier or special filter IC, its bandwidth is depending on the centre frequency of the low-frequency magnetic signal of reception, and its bound cutoff frequency can regulate flexibly; Modulation system, the coded system of low-frequency magnetic induced signal of the circuit structure form that described demodulator circuit 1053, decoding circuit 1054 adopt depending on receiving.
Described decoding circuit 1054 can realize decoding by corresponding application-specific integrated circuit by hardware mode, also can realize decoding by master controller 101 by house software mode; When described decoding circuit 1054 is realized by application-specific integrated circuit hardware mode, the connected mode of itself and described master controller 101 can be single serial pattern, also can be multi-thread parallel schema; When described decoding circuit 1054 is realized by house software mode by described master controller 101, the low-frequency magnetic induced signal of reception directly delivers to described master controller 101 after amplification, filtering, demodulation (if necessary).
Described magnetic signal transmitter module 104 is made up of coding circuit 1044, modulation circuit 1043, D/A change-over circuit 1042 and driving circuit 1041, is linked in sequence successively; Described coding circuit 1044 is also connected with master controller 101, and described driving circuit 1041 is also connected with pickup coil 103.Described modulation circuit 1043 can adjust as required, when for simplify signal link and only need to carry out base band signal transmission time, the direct and described D/A change-over circuit 1042 of described coding circuit 1044 is connected.
Described master controller 101 needs the information entrained by the second magnetic signal of launching for generation of described radio-frequency SIM card 100, this information is digital baseband signal; The coded treatment of certain way taked by described coding circuit 1044 for the digital baseband signal provided master controller 101, coded system viewing system requires and determines; Described modulation circuit 1043 is for taking the modulation treatment of certain way to the digital baseband signal after coding, modulation system viewing system requires and determines; Described D/A change-over circuit 1042 is for being converted to low-frequency analog signal by the digital modulated signal after coding, modulation; Described driving circuit 1041 for amplifying this low-frequency analog signal, and drives pickup coil 103 to produce low frequency alternating magnetic field, sends the second magnetic signal.
The pattern that described coding circuit 1044 adopts can select any one without the code structure of DC component, such as Manchester's cde, Differential Manchester Encoding, alternate mark inversion code (AMI), High Density Bipolar 3 (HDB3), Miller code (Miller) etc.; The modulation system of described modulation circuit 1043 can adopt any one without the digital modulation mode of changes in amplitude, the digital modulation modes such as such as on-off keying method (OOK), frequency shift keying (FSK), binary phase shift keying method (BPSK), Quadrature Phase Shift Keying method (QPSK), the waveform of carrier signal can choose the waveforms such as sine wave, triangular wave or square wave; The digital input end of described D/A change-over circuit 1042 can adopt serial input mode or parallel input mode, analog output can adopt curtage wave form output mode that is single-ended or difference form, and conversion accuracy and switching rate can be determined according to system performance requirements; Described driving circuit 1041 is the multistage amplifier circuit at least comprising one-level amplification, and can be built by integrated operational amplifier and form, also can be built by discrete transistor and form, gain can regulate as required.
Described coding circuit 1044 can realize coding by corresponding application-specific integrated circuit by hardware mode, also can realize coding by master controller 101 by house software mode; When described coding circuit 1044 is realized by application-specific integrated circuit hardware mode, the connected mode of itself and described master controller 101 can be single serial pattern, also can be multi-thread parallel schema; When described coding circuit 1044 is realized by house software mode by described master controller 101, the low frequency coded data that described master controller 101 produces directly delivers to modulation circuit 1043(described in rear class if necessary) or described D/A change-over circuit.
Rf data transceiver module 102 is made up of radio-frequency (RF) transceiver 1023, impedance matching network 1022 and radio-frequency antenna 1021, is linked in sequence successively; Described radio-frequency (RF) transceiver 1023 is connected by serial bus interface with described master controller 101, any one can be selected to support the mode bus of full duplex or half-duplex operation, such as Serial Peripheral Interface (SPI) interface, UART Universal Asynchronous Receiver Transmitter (UART) interface etc.; Described impedance matching network 1022 is for connecting radio-frequency (RF) transceiver 1023 and radio-frequency antenna 1021, and it act as radiofrequency signal unreflected maximum power transfer on link of guaranteeing to launch or receive; Described radio-frequency antenna 1021 is for outwardly space radiation energy of electromagnetic field and reception are from aerial electromagnetic field, and it can be unipole antenna form or dipole antenna form.
The user identity identification data of the mobile phone service that the operator that described SIM card microcontroller 106 is supported for radio-frequency SIM card described in Storage and Processing 100 provides, and carry out data interaction with master controller 101 by the smart card principal and subordinate interface of standard; Described SIM card interface module 107 is for providing the external interface of described radio-frequency SIM card 100 with mobile communication terminal, and its interface characteristic meets the requirement of ISO/IEC7816 specification.
Fig. 4 is the schematic diagram of wherein a kind of planar structure of radio-frequency SIM card 100 of the present invention.As shown in Figure 4, the structure of described radio-frequency SIM card 100 comprises circuit function module region 201 and pickup coil region 202.Wherein, described circuit function module region 201 comprises the hardware circuit entity of above-mentioned master controller 101, rf data transceiver module 102, magnetic signal transmitter module 104, magnetic signal receiver module 105, SIM card microcontroller 106 and SIM card interface module 107; Described pickup coil region 202 is PCB coil, be printed on the surrounding of described radio-frequency SIM card 100 card, described pickup coil 202 can individual layer coiling or sandwich wound, depending on the PCB number of plies of described radio-frequency SIM card 100, number of turn scope can be set between 10 to 40 circles, and its outer ring size takes advantage of 15mm close to the physical dimension 25mm of described radio-frequency SIM card 100.
Fig. 5 is when the low frequency transceiver channel of described radio-frequency SIM card 100 shares a pickup coil 302, the instance graph switched by simulating signal switch 301 pairs of low frequency transceiver channels.As shown in Figure 5, this instance system is made up of master controller 101, magnetic signal transmitter module 104, magnetic signal receiver module 105, simulating signal switch 301, pickup coil 302.Wherein said master controller 101 provides a switch controlling signal, this signal is a square-wave signal of high and low level checker, period of change can adjust accordingly according to practical application, described simulating signal switch 301 is controlled by it, such as when this control signal is high level, described simulating signal switch 301 is selected to connect magnetic signal transmitter module 104; When this control signal is low level, described simulating signal switch 301 is selected to connect magnetic signal receiver module 105.Thus realize low frequencies passage and low frequency reception passage shares described pickup coil 302, be conducive to saving cost of products and structure space.Described simulating signal switch 301 can be single-pole double-throw switch (SPDT) or double-point double-throw switch.
Fig. 6 provides a typical apply Scene case of radio-frequency SIM card of the present invention.As shown in Figure 6, described radio-frequency SIM card 100 is equipped in mobile communication terminal 401, carry out communication distance control and data interaction by two-way low channel and two-way radio-frequency channel between described mobile communication terminal 401 and corresponding radio-frequency card reader 402, rig-site utilization data upload to corresponding background server 403 is for further processing by corresponding hardwired data links by described radio-frequency card reader 402 again.
Fig. 7 provides the case study on implementation carrying out low frequency two-way communication and the transaction of follow-up execution radio frequency based on radio-frequency SIM card of the present invention.As shown in Figure 7, the implementation case relates to the transaction flow utilizing described radio-frequency SIM card to carry out the application of mobile payment class, and described method of work comprises the steps:
Step 501, for reducing unnecessary power dissipation overhead, described radio-frequency SIM card is in dormant state under the default situations of no deal, after the mobile communication terminal of the described radio-frequency SIM card of equipment enters into the low frequency magnetic field region of corresponding radio-frequency card reader generation, enters step 502.
Wherein, the internal circuit functional module that described dormant state is defined as described radio-frequency SIM card is in standby mode or power-down mode or low-power consumption mode.
Step 502, described radio-frequency SIM card is activated by the low frequency magnetic field that described radio-frequency card reader produces, and opens low-frequency magnetic Signal reception channel selecting receiving mode simultaneously, enters step 503.
Wherein, activation refers to that the inner corresponding circuit function module of described radio-frequency SIM card enters normal operating conditions, and this process also can be called to be waken up.
Step 503, described radio frequency SIM card crosses the low-frequency magnetic induced signal that low frequency magnetic signal receiving cable receives the transmission of described radio-frequency card reader, described low-frequency magnetic induced signal carries the information such as radio-frequency card reader ID, random number of several byte length, described radio-frequency SIM card resolves this low frequency magnetic field information, enters step 504.
Step 504, detected low frequency magnetic field intensity level and the magnetic field intensity threshold value preset for distance controlling compare by described radio-frequency SIM card, judge detected value whether within the interval of preset value requirement; If detected value does not meet preset value requirement, within the scope of the communication distance that the mobile communication terminal showing to equip described radio-frequency SIM card does not require at described radio-frequency card reader, then enter step 512; If detected value meets preset value requirement, within the scope of the communication distance that the mobile communication terminal showing to equip described radio-frequency SIM card has required at described radio-frequency card reader, then enter step 505.
Step 505, described radio-frequency SIM card is opened low-frequency magnetic signal transmission channel and is selected sending mode, prepares the request being responded described radio-frequency card reader by described low-frequency magnetic signal transmission channel, enters step 506.
Step 506, described radio-frequency SIM card adopts certain coded system, if be necessary, also can adopt certain modulation system, then send corresponding low frequency reply data by low-frequency magnetic signal transmission channel described in step 505 to described radio-frequency card reader, then enter step 507 and step 518 respectively; Wherein, the radio-frequency channel of described radio-frequency SIM card performs step 507, and the low-frequency magnetic signalling channel of described radio-frequency SIM card performs step 518.
Wherein, described low frequency reply data is generated according to the low frequency magnetic field information of the described radio-frequency card reader received before it by described radio-frequency SIM card, and described low frequency reply data comprises the information such as described radio-frequency SIM card self ID, random number, radio communication frequency, radio communication address of several byte length.
Step 507, described radio-frequency SIM card is selected to open corresponding radio frequency reception channel, and the frequency of described radio frequency reception channel, address should be consistent with the radio communication address comprised in the low frequency reply data described in step 506, frequency point information, then enter step 508.
Step 508, the rf data that radio-frequency card reader described in the radio frequency reception channel wait-receiving mode of described radio-frequency SIM card described in step 507 sends; If receive corresponding rf data, then enter step 509; If do not receive corresponding rf data, then enter step 515.
Step 509, described radio-frequency SIM card is selected to open corresponding rf data sendaisle, and the information of carrying in the rf data that the frequency of described rf data sendaisle, address are received by radio-frequency SIM card described in step 508 is determined, then enters step 510.
Step 510, described radio-frequency SIM card enters rf data transceiver mode, and to be performed the reciprocal process of transaction data by two-way radio-frequency receiving-transmitting passage with described radio-frequency card reader, enters step 511 subsequently.
Step 511, after the transaction between the mobile communication terminal and described radio-frequency card reader of the described radio-frequency SIM card of equipment completes, described radio-frequency SIM card returns dormant state wait and concludes the business next time.
Step 512, described radio-frequency SIM card, in certain hour t1, continues the low frequency magnetic field information (i.e. the first magnetic signal) that the described radio-frequency card reader of trial reception sends, then enters step 513.
Step 513, if the low frequency magnetic field information receiving in described radio-frequency SIM card time t1 described in step 512 that described radio-frequency card reader sends, then returns step 504; If described radio-frequency SIM card does not receive any low frequency magnetic field information that described radio-frequency card reader sends yet after exceeding time t1 described in step 512, then enter step 514.
Step 514, the mobile communication terminal equipping described radio-frequency SIM card will disconnect the connection with described radio-frequency card reader, and transaction no longer down performs, and described radio-frequency SIM card returns dormant state.
Step 515, described radio-frequency SIM card can in a period of time t2, and the radio frequency reception channel described in step 508 continues the rf data that described in wait-receiving mode, radio-frequency card reader sends, and then enters step 516.
Step 516, if the rf data receiving the transmission of described radio-frequency card reader in described radio-frequency SIM card time t2 described in step 515, then returns step 509; If described radio-frequency SIM card does not receive the rf data that described radio-frequency card reader sends yet after exceeding time t2 described in step 515, then enter step 517.
Step 517, the mobile communication terminal equipping described radio-frequency SIM card will disconnect the connection with described radio-frequency card reader, and transaction no longer down performs, and described radio-frequency SIM card returns dormant state.
Step 518, described radio-frequency card reader will uninterruptedly send the low-frequency magnetic field signal (i.e. the first magnetic signal) comprising distance controlling information, low channel is switched back low-frequency magnetic Signal reception passage by described radio-frequency SIM card again, select low-frequency magnetic field signal described in receiving mode wait-receiving mode, enter step 519.
Step 519, described radio-frequency SIM card is performing with the rf data process of exchange of described radio-frequency card reader, detects the low frequency magnetic field information that described radio-frequency card reader sends continuously simultaneously, enter step 520 by low-frequency magnetic Signal reception passage.
Step 520, described radio-frequency SIM card judges that the low frequency magnetic field intensity of its low-frequency magnetic field signal detected (i.e. the first magnetic signal) is whether within distance controlling claimed range.If described low frequency magnetic field intensity meets the requirements, show that the communication distance of the mobile communication terminal and described radio-frequency card reader equipping described radio-frequency SIM card is still in effective range, then continue to perform step 510; If described low frequency magnetic field intensity is undesirable, show that the communication distance of the mobile communication terminal and described radio-frequency card reader equipping described radio-frequency SIM card exceeds effective range, then perform step 521.
Step 521, the mobile communication terminal equipping described radio-frequency SIM card disconnects the connection with described radio-frequency card reader, stop transaction, and described radio-frequency SIM card returns dormant state.
Radio-frequency SIM card and radio-frequency card reader also can be exchanged by said method, carry out Distance Judgment by radio-frequency card reader by reception second magnetic signal.
The radio-frequency SIM card with low frequency two-way function provided by the present invention, two-way low frequency distance controlling is realized by low-frequency magnetic Signal reception and transmitter module, the equipment mobile communication terminal of described radio-frequency SIM card and the effective communication distance of the radio-frequency card reader of the described radio-frequency SIM card of corresponding support accurately can be controlled at one limited and reasonably in interval, overcome the radio-frequency SIM card adopting one-way distance to control well and in use easily occur that transaction distance is by the problem zoomed out, efficiently avoid distance by the risk brought after zooming out, improve experience and the impression of user.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (30)
1. a radio-frequency unit, comprises rf data transceiver module, it is characterized in that, also comprise:
Magnetic signal receiver module, for receiving the first magnetic signal that external radio frequency terminal sends; Described first magnetic signal carries the identification information of the radio-frequency card reader launching this first magnetic signal;
Magnetic signal transmitter module, for generation of and launch the second magnetic signal; Described second magnetic signal carries the identification information of described radio-frequency unit;
Described magnetic signal receiver module and magnetic signal transmitter module and external radio frequency terminal carry out the two-way communication of low frequency link;
Described radio-frequency unit controls the communication distance with described external radio frequency terminal by described magnetic signal, and described radio-frequency unit carries out message exchange by described rf data transceiver module and described external radio frequency terminal; Described radio-frequency unit also comprises master controller and pickup coil;
Described master controller is connected with described rf data transceiver module, magnetic signal receiver module and magnetic signal transmitter module respectively; Described pickup coil is connected with described magnetic signal receiver module and magnetic signal transmitter module respectively;
This information for generation of the information entrained by described second magnetic signal, and is sent to described magnetic signal transmitter module by described master controller; Described master controller, also for the electric signal changed according to the first magnetic signal and the threshold value preset, judges distance between described radio-frequency unit and described external radio frequency terminal whether in the effective communication distance preset;
Described rf data transceiver module, for carrying out the transmitting-receiving of rf data between described radio-frequency unit and described external radio frequency terminal;
The electric signal of described magnetic signal receiver module also for being converted to by described first magnetic signal sends to described master controller;
Described magnetic signal transmitter module, according to the information that described master controller produces, produces and launches the second magnetic signal;
Described pickup coil is for receiving the first magnetic signal and being converted into electric signal and sending to described magnetic signal receiver module; Described pickup coil is also for launching described second magnetic signal that described magnetic signal transmitter module produces.
2. radio-frequency unit according to claim 1, is characterized in that:
Described radio-frequency unit judges the radio frequency communication distance between described external radio frequency terminal and described radio-frequency unit according to the first magnetic signal received, and sends radio frequency communication distance confirmation by the second magnetic signal to described external radio frequency terminal.
3. radio-frequency unit according to claim 1, is characterized in that: according to the first magnetic signal received, described radio-frequency unit judges that distance between described external radio frequency terminal is whether in the effective communication distance preset.
4. radio-frequency unit according to claim 3, is characterized in that:
Described radio-frequency unit also comprises master controller, and described magnetic signal receiver module is used for the electric signal that described first magnetic signal converts to send to described master controller; Described master controller is used for the electric signal converted to according to the first magnetic signal and the threshold value preset, and judges distance between described radio-frequency unit and described external radio frequency terminal whether in the effective communication distance preset.
5. radio-frequency unit according to claim 1, is characterized in that: described external radio frequency terminal is radio-frequency card reader.
6. radio-frequency unit according to claim 1, is characterized in that:
Described radio-frequency unit also comprises pickup coil, and described pickup coil is for receiving the first magnetic signal and being converted into electric signal and sending to described magnetic signal receiver module; Described pickup coil is also for launching described second magnetic signal that described magnetic signal transmitter module produces.
7. radio-frequency unit according to claim 1, is characterized in that:
Described radio-frequency unit also comprises master controller, information entrained by the second magnetic signal that described master controller is launched for generation of described magnetic signal transmitter module, the information that described magnetic signal transmitter module produces according to described master controller, produces and launches the second magnetic signal.
8. the radio-frequency unit according to any one of claim 1 to 7, is characterized in that: described radio-frequency unit is radio-frequency SIM card.
9. the radio-frequency unit according to claim 1 or 6, is characterized in that:
Described magnetic signal receiver module comprises the amplifying circuit, filtering circuit and the decoding circuit that connect in turn, and described amplifying circuit is connected with described pickup coil, and described decoding circuit is connected with described master controller;
Described amplifying circuit, amplifies for the electric signal converted to the first magnetic signal received from described pickup coil;
Described filtering circuit, for carrying out filtering to the electric signal after amplification, suppresses the Noise and Interference outside useful signal frequency band range;
The coded system that described decoding circuit adopts according to the radio-frequency unit launching described first magnetic signal is decoded to filtered signal, and sends to described master controller.
10. radio-frequency unit according to claim 9, is characterized in that:
Described magnetic signal receiver module also comprises the demodulator circuit be arranged between filtering circuit and decoding circuit; The modulation system that described demodulator circuit is used for adopting according to described external radio frequency terminal carries out demodulation to filtered signal, and sends to described decoding circuit.
11. radio-frequency units according to claim 1 or 6, is characterized in that:
Described magnetic signal receiver module comprises the amplifying circuit and filtering circuit that connect in turn, and described amplifying circuit is connected with described pickup coil, and described filtering circuit is connected with described master controller;
Described amplifying circuit, amplifies for the electric signal converted to the first magnetic signal received from described pickup coil;
Described filtering circuit, for carrying out filtering to the electric signal after amplification, suppresses the Noise and Interference outside useful signal frequency band range;
Described master controller, the coded system also for adopting according to the radio-frequency unit launching described first magnetic signal is decoded to filtered signal.
12. radio-frequency units according to claim 11, is characterized in that:
Described magnetic signal receiver module also comprises the demodulator circuit be arranged between filtering circuit and master controller; The modulation system that described demodulator circuit is used for adopting according to described external radio frequency terminal carries out demodulation to filtered signal, and sends to described master controller.
13. radio-frequency units according to claim 1 or 6, is characterized in that:
Described magnetic signal transmitter module comprises the coding circuit, D/A change-over circuit and the driving circuit that connect in turn, and described coding circuit is connected with described master controller, and described driving circuit is connected with described pickup coil;
Described master controller needs the low frequency magnetic field information of launching for generation of described radio-frequency unit, described Magnetic Field is digital baseband signal;
Described coding circuit is used for encoding to the digital baseband signal that described master controller provides;
Described D/A change-over circuit is used for the digital signal after by coding and is converted to low-frequency analog signal;
Described driving circuit for amplifying described low-frequency analog signal, and drives described pickup coil to produce low frequency alternating magnetic field.
14. radio-frequency units according to claim 13, is characterized in that:
Described magnetic signal transmitter module also comprises the modulation circuit be arranged between described coding circuit and D/A change-over circuit; Described modulation circuit is used for the digital baseband signal after to coding and modulates, and sends to described D/A change-over circuit.
15. radio-frequency units according to claim 1 or 6, is characterized in that:
Described magnetic signal transmitter module comprises the D/A change-over circuit and driving circuit that connect in turn, and described D/A change-over circuit is connected with described master controller, and described driving circuit is connected with described pickup coil;
Described master controller for generation of low frequency coded data, and sends to described D/A change-over circuit;
Described D/A change-over circuit is used for described low frequency coded data to be converted to low-frequency analog signal;
Described driving circuit for amplifying described low-frequency analog signal, and drives described pickup coil to produce low frequency alternating magnetic field.
16. radio-frequency units according to claim 15, is characterized in that:
Described magnetic signal transmitter module also comprises the modulation circuit be arranged between described master controller and D/A change-over circuit; Described modulation circuit is used for modulating described low frequency coded data, and sends to described D/A change-over circuit; The modulation system of described modulation circuit adopts the digital modulation mode without changes in amplitude; The modulation system of described modulation circuit is on-off keying method, frequency shift keying, binary phase shift keying method or Quadrature Phase Shift Keying method; The waveform of the carrier signal that described modulation circuit adopts is sine wave, triangular wave or square wave.
17. radio-frequency units according to claim 1 or 6, is characterized in that:
Described pickup coil is the multi-coil of low frequency reception passage, low frequencies passage point, or the unicoil share for low frequency reception passage, low frequencies passage.
18. radio-frequency units according to claim 17, is characterized in that:
When the unicoil that described pickup coil adopts low frequency reception passage, low frequencies passage share, described unicoil and be provided with simulating signal switch between described low-frequency magnetic signal receiving module and low-frequency magnetic signal emission module, described simulating signal switch is also connected with described master controller; Described master controller provides switch controlling signal to described simulating signal switch, to control low-frequency magnetic signal receiving module or the connection between low-frequency magnetic signal emission module and described unicoil described in described simulating signal switching over.
19. radio-frequency units according to any one of claim 1 to 7, is characterized in that:
The highest predetermined transmitting-receiving frequency of operation of described magnetic signal receiver module and magnetic signal transmitter module is in tonal range, very low frequency (VLF) frequency range or low frequency frequency range.
20. radio-frequency units according to claim 19, is characterized in that:
The frequency range of described tonal range is 300Hz to 3kHz; The frequency range of described very low frequency (VLF) frequency range is 3kHz to 30kHz; The frequency range of described low frequency frequency range is 30kHz to 300kHz.
21. radio-frequency units according to claim 19, is characterized in that:
Described magnetic signal receiver module and magnetic signal transmitter module carry out the two-way communication of low frequency link by TDD mode or mode of frequency division duplexing and the radio-frequency unit of launching the first magnetic signal; Further, the frequency of operation of described magnetic signal receiver module and the frequency of operation of described magnetic signal transmitter module are less than the highest predetermined transmitting-receiving frequency of operation.
22. radio-frequency units according to any one of claim 1 to 7, is characterized in that:
Described rf data transceiver module comprises the radio-frequency (RF) transceiver, impedance matching network and the radio-frequency antenna that connect in turn, and described radio-frequency (RF) transceiver is also connected with described master controller.
23. radio-frequency units according to claim 22, is characterized in that:
Described radio-frequency (RF) transceiver adopts radio communication mode, and frequency of operation is in very high frequency(VHF) VHF frequency range, superfrequency uhf band or ultrahigh frequency SHF frequency range.
24. radio-frequency units according to claim 22, is characterized in that:
Described radio-frequency (RF) transceiver frequency of operation is 433MHz, 915MHz, 2.4GHz or 5.8GHz.
25. radio-frequency units according to claim 22, is characterized in that:
Described impedance matching network is for guaranteeing radiofrequency signal unreflected maximum power transfer on link of launching or receiving.
26. 1 kinds of communication meanss, is characterized in that, comprising:
The mobile communication terminal being equipped with the radio-frequency unit as described in any one of claim 1 to 25 receives the first magnetic signal that external radio frequency terminal sends, and judges communication distance between described radio-frequency unit and external radio frequency terminal whether in the scope of preset value; Described first magnetic signal carries the identification information of the radio-frequency card reader launching this first magnetic signal;
Pickup coil in described radio-frequency unit receives the first magnetic signal and is converted into electric signal and sends to magnetic signal receiver module; The electric signal that described first magnetic signal converts to is sent to the master controller in radio-frequency unit by described magnetic signal receiver module;
When communication distance is in preset range, described radio-frequency unit sends the second magnetic signal to described external radio frequency terminal, and and described external radio frequency eventually between carry out data communication by radio frequency; Described second magnetic signal carries the identification information of described radio-frequency unit: this information is sent to described magnetic signal transmitter module by the master controller in described radio-frequency unit; Described magnetic signal transmitter module, according to the information that described master controller produces, produces and launches the second magnetic signal; Described pickup coil launches described second magnetic signal that described magnetic signal transmitter module produces;
During aforementioned radio communication, the continual received RF card reader of described radio-frequency unit sends the first magnetic signal, and judges communication distance whether in the scope of preset value, if when communication distance is not in preset range, then stops aforementioned RF data communications.
27. communication meanss according to claim 26, is characterized in that:
After communication between the described mobile communication terminal of equipment and described external radio frequency terminal completes, described radio-frequency unit enters dormant state and waits for and communicates next time.
28. communication meanss according to claim 26, is characterized in that:
When communication distance is beyond preset range, described radio-frequency unit continues to attempt to receive the first magnetic signal that external radio frequency terminal sends in the first Preset Time, and judges communication distance between described radio-frequency unit and external radio frequency terminal whether in the scope of preset value.
29. communication meanss according to claim 28, is characterized in that:
When described radio-frequency unit does not receive the first magnetic signal in the first Preset Time, then the mobile communication terminal equipping described radio-frequency unit disconnects the connection with described external radio frequency terminal, and described radio-frequency unit enters dormant state.
30. communication meanss according to claim 26, is characterized in that:
When described radio-frequency unit detects that communication distance is in preset range, described radio-frequency unit attempts the rf data receiving the transmission of external radio frequency terminal in the second Preset Time, if receive the rf data that external radio frequency terminal sends in the second Preset Time, then and described external radio frequency eventually between carry out RF data communications, if do not receive the rf data that external radio frequency terminal sends in the second Preset Time, the mobile communication terminal then equipping described radio-frequency unit disconnects the connection with described external radio frequency terminal, and described radio-frequency unit enters dormant state.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110112459.7A CN102768725B (en) | 2011-05-03 | 2011-05-03 | A kind of radio-frequency unit and communication means |
| PCT/CN2012/074390 WO2012149869A1 (en) | 2011-05-03 | 2012-04-19 | Communication method, communication device and communication system |
| US14/162,787 US9400903B2 (en) | 2011-05-03 | 2014-01-24 | Communication method, device, and system |
| US15/186,705 US10019611B2 (en) | 2011-05-03 | 2016-06-20 | Communication device and system |
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| CN201110112459.7A CN102768725B (en) | 2011-05-03 | 2011-05-03 | A kind of radio-frequency unit and communication means |
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| CN102768725A CN102768725A (en) | 2012-11-07 |
| CN102768725B true CN102768725B (en) | 2015-12-16 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973341A (en) * | 2013-02-06 | 2014-08-06 | 国民技术股份有限公司 | Double-frequency switching device and method |
| CN104123484A (en) * | 2013-04-25 | 2014-10-29 | 国民技术股份有限公司 | Terminal, authentication device and communication methods of terminals and authentication devices |
| CN103873987A (en) * | 2014-02-28 | 2014-06-18 | 深圳市霞乐高电子科技有限公司 | Anti-interference remote wireless microphone system and wireless audio transmission method thereof |
| CN105938539B (en) * | 2016-01-13 | 2018-08-17 | 天地融科技股份有限公司 | Smart card keeps the method and smart card of working condition during marching into the arena again |
| CN109118738A (en) * | 2018-06-27 | 2019-01-01 | 普天东方通信集团有限公司 | A kind of table class individual cultivation method and system based on magnetic field communications |
| CN113300726B (en) * | 2021-05-21 | 2022-09-02 | 北京玖瑞科技有限公司 | Radio frequency signal sending module, data transmission system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201057561Y (en) * | 2007-04-17 | 2008-05-07 | 深圳市远望谷信息技术股份有限公司 | Fixed radio frequency reader-writer |
| CN101517430A (en) * | 2006-09-25 | 2009-08-26 | 马尔科·波罗 | Device for controlling personal belongings |
| CN201707679U (en) * | 2009-12-09 | 2011-01-12 | 国民技术股份有限公司 | Radiofrequency device, radiofrequency card reader and relative communication system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2454823Y (en) * | 2000-10-26 | 2001-10-17 | 深圳市世纪潮智能科技有限公司 | Long distance radiofrequency recognization device |
| US6892052B2 (en) * | 2002-03-26 | 2005-05-10 | Nokia Corporation | Radio frequency identification (RF-ID) based discovery for short range radio communication |
| CN101596341A (en) * | 2009-07-10 | 2009-12-09 | 梅州康立高科技有限公司 | A kind of ultra-low frequency transcranial magnetic stimulation device and preparation method thereof |
-
2011
- 2011-05-03 CN CN201110112459.7A patent/CN102768725B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517430A (en) * | 2006-09-25 | 2009-08-26 | 马尔科·波罗 | Device for controlling personal belongings |
| CN201057561Y (en) * | 2007-04-17 | 2008-05-07 | 深圳市远望谷信息技术股份有限公司 | Fixed radio frequency reader-writer |
| CN201707679U (en) * | 2009-12-09 | 2011-01-12 | 国民技术股份有限公司 | Radiofrequency device, radiofrequency card reader and relative communication system |
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