CN101303745A - Dual interface SIM card and its radio frequency identification system - Google Patents

Abstract

The invention discloses a dual-interface SIM card, which includes a SIM card base, a contact card metal contact and a non-contact antenna, and also includes a SIM card chip embedded in the SIM card base; the non-contact SIM card of the dual-interface The non-contact antenna is directly embedded inside the SIM card base, and the two ends of the non-contact antenna are respectively connected to the first antenna pin ANT ₁ and the second antenna pin ANT ₂ of the SIM card chip. The invention also discloses a radio frequency identification system using the dual-interface SIM card, including a reader, a background system, a communication interface between the reader and the background system, a mobile communication device, and a dual-interface SIM card and a signal booster. The signal booster is used to enhance the response signal from the dual-interface SIM card back to the reader. The radio frequency identification system of the present invention successfully applies mobile communication equipment to the RFID system, thereby realizing non-contact short-distance radio frequency identification at low cost.

Description

Dual interface SIM card and its radio frequency identification system

technical field

The invention relates to a subscriber identity module (Subscriber Identity Model, hereinafter referred to as SIM) card, in particular to a dual-interface SIM card and a radio frequency identification system thereof.

Background technique

After more than ten years of development, radio frequency identification technology (Radio Frequency Identification, hereinafter referred to as RFID) technology, including non-contact integrated circuit card (Integrated Circuit Card, referred to as IC card), has penetrated into every corner of modern life and is widely used in Public transportation, access control, small electronic payment and other fields. Radio frequency identification technology is a kind of automatic identification technology. The composition of radio frequency identification system generally includes at least two parts: (1) electronic tag, the English name is Tag; (2) reader, the English name is Reader. Electronic data in an agreed format is generally stored in the electronic tag. In practical applications, the electronic tag is attached to the surface of the object to be identified. The reader is also called a reading device, which can read and identify the electronic data stored in the electronic tag without contact, so as to achieve the purpose of automatically identifying objects. Further, management functions such as collection, processing and remote transmission of object identification information are realized through computers and computer networks. For most RFID systems, a fixed frequency will be used and a set of standard protocols will go with it.

Digital modulation techniques, such as ASK, FSK and PSK modulation, are widely used in the RFID field. Amplitude Shift Keying (ASK for short) takes different values according to the modulation of the carrier amplitude by digital data, for example, corresponding to binary 0, the carrier amplitude is 0; corresponding to binary 1, the carrier amplitude is 1. AM techniques are simple to implement but are susceptible to gain variations. Frequency Shift Keying (FSK for short) is to modulate the frequency of the carrier according to the value of digital data (such as 0 or 1). For example, the carrier frequency corresponding to binary 0 is F1, and the carrier frequency corresponding to binary 1 is F2. This technology has good anti-interference performance, but occupies a large bandwidth. Phase Shift Keying (PSK) is to modulate the carrier phase according to the value of digital data. For example, 1 is represented by a phase shift of 180, and 0 is represented by a phase shift of 0. This modulation technology has the best anti-interference performance, and the change of the phase can also be used as timing information to synchronize the clocks of the transmitter and receiver, and double the transmission rate. These modulation methods are existing mature modulation technologies and are widely used in various communication systems.

In recent years, driven by the needs of rail transit, logistics management, anti-counterfeiting, and identification, RFID technology has continued to advance and its applications have become more and more popular. The market urgently needs various RFID electronic tags and identification equipment. There is generally an electronic wallet inside the electronic tag. The cardholder deposits a certain amount in the electronic tag in advance, and the transaction amount is directly deducted from the stored value account during the transaction. However, single-function electronic tags also have some disadvantages, such as: electronic tag top-up must go to a special top-up center, there is no way to set a password for relatively large transactions, and it is impossible to combine RFID payment and mobile payment.

At the same time, after more than 20 years of rapid development, mobile communication terminals have almost become a must-have portable device for consumers, with a very high penetration rate, and there is a trend to integrate more functions on mobile terminals. It is an existing mature technology to make payment using the mobile communication network of the mobile phone itself, such as GSM and CDMA. However, it is the current development direction of radio frequency identification to effectively combine mobile phones and electronic tags to make mobile phones as convenient as bus cards. It is a market that operators and mobile operators are currently vigorously developing.

Influenced by mobile payment in Japan and South Korea, micropayment is an area that operators have been hoping to enter. Because it can provide a very good solution for real-time payment and on-site payment, non-contact short-range radio frequency identification has extremely broad application prospects, and will bring unprecedented opportunities to the currently slow-growing mobile payment industry. The combination of mobile terminals and RFID technology will be a new development direction in the next ten years. Especially in the 3G era, ubiquitous RFID readers with wireless connection functions and RFID for non-contact applications will be the top priority of development. At present, there are mainly two sets of solutions based on non-contact technology in the industry: Combi SIM card solution and near field communication solution (referred to as NFC solution).

The Combi SIM card solution, also known as the dual-interface SIM card solution, refers to replacing the internal SIM card of the mobile phone with a Combi SIM card, and adding a non-contact IC card application interface on the basis of retaining the SIM card function of the original contact interface. There are two typical methods: 1. The non-contact antenna of the non-contact IC card is printed on the plastic film and then pasted on the surface of the SIM card; 2. The non-contact antenna of the non-contact IC card is attached to the mobile phone as an independent component. , Lead the antenna to the front or back of the mobile phone, and the antenna is connected to the C4 and C8 interfaces that have not been used by the SIM card. But the disadvantages of these two solutions are: the antenna is pasted on the surface of the SIM card or drawn out to the front or back of the mobile phone, which will easily cause the antenna to break and damage during the installation process, and cause inconvenience to the user. Shielding effect, the dual-interface SIM card can receive the signal from the reader and the signal reflected to the reader is very weak, if the signal returned by the dual-interface SIM card is not amplified and the reader matched with the dual-interface SIM card Without a signal booster, the quality of communication between the dual-interface SIM card and the reader will be very poor, and the reader will hardly receive the response returned by the dual-interface SIM card.

The NFC solution is a new solution for radio frequency identification proposed by companies such as Nokia and Philips in recent years. The basic method is to add an RFID module for payment to the newly designed mobile phone, and use a special communication protocol between the RFID module and the mobile phone. communicate with each other. This method can better solve the problem of using mobile phones for radio frequency identification, but the disadvantage is that users must modify existing mobile phones, or even buy a new mobile phone, which is not acceptable to all users at this stage. It is also a great waste of resources for the whole society.

Please refer to FIG. 2 for a schematic diagram of the internal structure of a typical dual-interface IC card in the prior art and FIG. 3 for a schematic diagram of an RF interface circuit for a typical dual-interface IC card in the prior art. The structure diagram of a typical dual-interface IC card chip launched by Gemplus is shown in Figure 2. The communication standard of the contact part conforms to the ISO/IEC7816 standard, and the communication standard of the non-contact part conforms to the ISO/IEC 14443TYPEA/TYPEB standard. This typical dual-interface IC card chip is mainly composed of a radio frequency (Radio Frequency, referred to as RF) interface, a central processing unit (Central Processing Unit, hereinafter referred to as CPU), an interrupt processor, a random number generator, a read-only memory (referred to as ROM), EEPROM (that is, programmable electrically erasable read-only memory), external RAM (that is, random access memory), cyclic redundancy check (referred to as CRC) module, clock module, ISO/IEC7816 and other modules. Among them, the RF interface is the communication interface between the dual-interface IC card and the 13.56MHz reader; the CPU is the central processing unit of the dual-interface IC card, which together with the internal software is mainly used for the communication of the mobile phone and the completion of the transaction of the 13.56MHz reader; The processor is mainly used to handle interrupts of various peripherals; ROM is used to store internal firmware programs; EEPROM and external RAM are used to store data and intermediate variables of dual-interface IC cards; CRC module is used to generate cyclic redundancy checks Code, to ensure the integrity of the data in the communication process; the clock module is used for internal clock processing; the ISO/IEC7816 module is the communication interface between the mobile phone and the dual-interface IC card, and is the channel for the mobile phone to provide power to the IC card.

As shown in Figure 3, the RF interface is mainly composed of a 13.56MHz non-contact antenna, demodulation circuit, digital quantization circuit and modulation circuit.

The signal sent by the reader to the dual-interface IC card is received through a 13.56MHz antenna. Since the signal sent by the reader to the dual-interface IC card is a 100% ASK modulated signal, the demodulation circuit in the dual-interface IC card adopts diode peak envelope detection way to demodulate. After detection and output, the signal will be quantized by the quantization circuit and then become the baseband signal required by the logic circuit, and then sent to the CPU for processing.

When the dual-interface IC card responds to the signal to the reader, the CPU completes the encoding and sends it to the modulation circuit for modulation. The response reflection of the signal is completed by changing the load resistance in the modulation circuit in the RF interface.

Due to the shielding effect of the mobile phone battery and the circuit board, if the dual-interface IC card replaces the existing ordinary SIM card and is applied to the mobile phone environment, the dual-interface IC card will not be able to reliably receive the command signal sent by the reader, and at the same time the dual-interface IC card will send out a command signal. The signal will be greatly attenuated by the mobile phone environment, and such a small response signal cannot be received and distinguished by the reader. In view of this situation, it is impossible to directly put the dual-interface IC card into the mobile phone and apply it to the radio frequency identification system.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the technical problem to be solved in the present invention is to provide a dual-interface SIM card and its radio frequency identification system, which realizes the non-contact of the mobile phone without transforming the existing RFID reader and mobile phone. short-range radio frequency identification.

In order to solve the problems of the technologies described above, the technical solution of the present invention is:

A dual-interface SIM card, including a SIM card base, a contact card metal contact and a contactless antenna,

The dual-interface SIM card also includes a SIM card chip embedded in the SIM card base;

The non-contact antenna of the dual-interface SIM card is directly embedded in the SIM card base, and the two ends of the non-contact antenna are respectively connected to the first antenna pin ANT ₁ and the second antenna pin of the SIM card chip. Antenna pin ANT ₂ .

The communication protocol between the dual-interface SIM card and the mobile communication device where it is located complies with the ISO/IEC7816 standard.

The signal sent by the reader to the dual-interface SIM card complies with the ISO/IEC 14443 standard, or the ISO/IEC15693 standard, or the ISO11784/ISO11785 standard.

The plane where the contactless antenna is located is parallel to the plane where the SIM card chip is located.

The plane where the non-contact antenna is located is parallel to the base plane of the SIM card.

A radio frequency identification system using the above dual-interface SIM card includes a reader, a background system, a communication interface between the reader and the background system, and a mobile communication device. The radio frequency identification system also includes a dual-interface SIM card and a signal booster.

The dual-interface SIM card is installed on the mobile communication device,

The signal booster is pasted on the reader or the mobile communication device, and is used to strengthen the response signal that the dual-interface SIM card returns to the reader,

The signal sent by the reader is directly received by the dual-interface SIM card in the mobile communication device, and the signal that the dual-interface SIM card responds to the reader is first sent to the described signal booster, and through the signal booster After signal enhancement is completed, it returns to the reader with a frequency protocol consistent with the reader.

The signal sent by the reader to the dual-interface SIM card complies with the ISO/IEC 14443 standard, or the ISO/IEC15693 standard, or the ISO11784/ISO11785 standard.

The signal modulation method that the dual-interface SIM card sends to the signal booster is amplitude-shift keying (Amplitude-shift keying, referred to as ASK), or frequency-shift keying (Frequency-shift keying, referred to as FSK), or phase-shift keying Control (Phase-shift keying, referred to as PSK) modulation method, the carrier frequency is 6.78MHz or 13.56MHz or 27.12MHz.

The communication standard from the signal booster to the reader is consistent with the communication standard from the reader to the dual-interface SIM card, and also conforms to the ISO/IEC 14443 standard, or the ISO/IEC 15693 standard, or ISO11784/ISO11785 standard.

The mobile communication device is a mobile phone using GSM, CDMA, 3G or 4G communication network.

Compared with prior art, the beneficial effect of the present invention is:

The present invention replaces the existing single-interface contact SIM card with a dual-interface SIM card, which can be used not only as a common single-interface contact SIM card, but also as non-contact short-distance radio frequency identification for mobile payment and access control. Compared with the dual-interface SIM card of the prior art, the non-contact antenna of the dual-interface SIM card of the present invention is embedded in the card base, so that the user will not cause the non-contact antenna to be broken or damaged during use, and avoid causing damage to the user. Inconvenient to use.

In the radio frequency identification system applied by the dual-interface SIM card of the present invention, a signal booster is added between the dual-interface SIM card and the reader, so that the mobile phone is realized without modifying the existing RFID reader and mobile communication terminal. Non-contact proximity radio frequency identification. At the same time, the signal booster as an intermediate signal bridge works in a passive way, avoiding the need to connect to AC or DC power in a wired way.

Due to the bridge function of the dual-interface SIM card of the present invention, mobile communication networks such as GSM/CDMA/3G/4G where the mobile phone is located can be effectively connected with the RFID payment network. The radio frequency identification system of the present invention successfully applies mobile communication equipment to the RFID system, thereby realizing non-contact short-distance radio frequency identification at low cost.

Description of drawings

Fig. 1 is a structural schematic diagram of the radio frequency identification system of the present invention;

Fig. 2 is a schematic diagram of the internal structure of a typical dual-interface IC card chip in the prior art;

Fig. 3 is a schematic diagram of the RF interface circuit of a typical dual-interface IC card chip in the prior art;

Fig. 4 is the RF interface circuit schematic diagram of dual-interface SIM card chip of the present invention;

Fig. 5 is a schematic diagram of the internal structure of the dual-interface SIM card of the present invention;

Fig. 6 is a schematic diagram of the external structure of the signal booster of the present invention;

Fig. 7 is a schematic diagram of the internal structure of the signal booster of the present invention;

Fig. 8 is a cross-sectional view along line A-A of Fig. 5 .

Detailed ways

The specific implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention should not be limited thereby.

(1) The dual-interface SIM card adopted by the present invention is used to replace the existing single-interface contact SIM card. Please refer to Figure 5 and Figure 8. Fig. 5 is a schematic diagram of the internal structure of the dual-interface SIM card of the present invention; Fig. 8 is a cross-sectional view along line A-A of Fig. 5 .

The so-called single-interface SIM card refers to a SIM card with a contact interface commonly used in the prior art, with metal contacts on the surface; the so-called dual-interface SIM card adds a non-contact antenna interface on the basis of a single-interface SIM card, which can Perform contactless communication. On the basis of functions such as calling of the original single-interface SIM card, the IC card function of small consumption and access control is added, the dual-interface SIM card of the present invention will adopt the structure of Figure 5, and the cross-section schematic diagram of the dual-interface SIM card is shown in Figure 8 Show.

A dual-interface SIM card 10 includes a SIM card base 13, a contact card metal contact 14, a non-contact antenna 11 and several gold wires.

The dual-interface SIM card 10 also includes a SIM card chip 12 embedded in the SIM card base 13;

The non-contact antenna 11 of the dual-interface SIM card 10 is directly embedded in the SIM card base 13, and the two ends of the non-contact antenna 11 are respectively connected to the first antenna pin of the SIM card chip 12. ANT ₁ 124 and the second antenna pin ANT ₂ 125. Since the non-contact antenna is inside the card base, the non-contact antenna will not be broken or damaged during use by the user, and inconvenience to the user will also be avoided.

The communication protocol between the dual-interface SIM card 10 and the mobile communication device 9 in which it is installed complies with the ISO/IEC7816 standard.

The signal sent by the reader 1 to the dual-interface SIM card 10 complies with the ISO/IEC 14443 standard, or the ISO/IEC 15693 standard, or the ISO11784/ISO11785 standard. For example: ISO/IEC 14443TAPEA/TAPEB standard.

The plane where the contactless antenna 11 is located is parallel to the plane where the SIM card chip 12 is located.

The plane where the non-contact antenna 11 is located is parallel to the plane of the SIM card base 13 .

The SIM card chip that dual-interface SIM card of the present invention adopts is introduced as follows:

The SIM card chip can be applied to a common single-interface contact SIM card, and can also be applied to a dual-interface SIM card. When used as a dual-interface SIM card, it can be used in the RFID field together with mobile communication equipment to realize radio frequency identification.

See Figure 4 and Figure 5. Fig. 4 is a schematic diagram of the RF interface circuit of the dual-interface SIM card chip of the present invention; Fig. 5 is a schematic diagram of the internal structure of the dual-interface SIM card of the present invention.

This SIM card chip 12 includes RF interface module, CPU, interrupt processor, random number generator, ROM, EEPROM, external RAM, cyclic redundancy check module, clock module, ISO/IEC7816 module and power supply pin VCC121, reset Pin RST122, clock pin CLK123, first antenna pin ANT ₁ 124, second antenna pin ANT ₂ 125, IO pin 126, spare pin NC127, ground pin GND128, the RF interface includes demodulation Amplifying circuit, digital quantization circuit and modulation circuit.

The RF interface of the SIM card chip 12 also includes a receiving amplifier circuit, which is used to amplify the command signal sent by the reader 1 to the dual-interface SIM card 10, and the output terminal of the receiving amplifier circuit is connected to the input terminal of the demodulation circuit Connected, the input end of the receiving amplifier circuit is connected with the non-contact antenna.

The RF interface of the SIM card chip 12 also includes a transmission power amplification circuit, which is used to amplify the response signal that the dual-interface SIM card 10 returns to the reader 1, and the output terminal of the modulation circuit is connected to the input of the transmission power amplification circuit. connected to the terminal, and the output terminal of the transmission power amplifier circuit is connected to the non-contact antenna.

The transmission power amplifying circuit is realized by a class C or class D power amplifier.

The receiving amplifying circuit is realized by a voltage amplifying circuit, such as a common emitter amplifying circuit.

When the dual-interface SIM card 10 responds to the reader 1, the response signal of the dual-interface SIM card is encoded by the CPU, modulated by the modulation circuit, and then sent to the power amplifier circuit for power amplification. , and then transmitted to the signal booster 2 through the non-contact antenna 11, and returned to the reader after the signal is boosted.

When the dual-interface SIM card 10 is used in the RFID field, the non-contact part of the communication complies with the ISO/IEC 14443 standard, ISO/IEC 15693 standard or ISO11784/ISO11785 standard.

The non-contact antenna 11 of the dual-interface SIM card 10 of the SIM card chip 12 is directly embedded in the SIM card base 13. The SIM card chip 12 and the non-contact antenna 11 are in the same plane. Terminals are respectively connected to two contacts of the SIM card chip 12, the first antenna pin ANT1 ₁₂₄ and the second antenna pin ANT2 ₁₂₅ .

The SIM card chip 12 also includes several gold wires, and each pin of the SIM card chip 12 is connected to corresponding parts of the metal contacts 14 of the contact card through gold wires. The power supply of the dual-interface SIM card 10 is provided by the mobile communication device 9, that is, the power supply of the SIM card chip 12 is provided by the mobile communication device 9, and the power supply and the ground wire pass through the contact card metal contact 14 and the gold wire 151, respectively. 152 is connected to the power supply pin VCC121 and the ground pin GND128.

The interface between the dual-interface SIM card 10 and the mobile communication device 9 is through the reset pin RST122, the clock pin CLK123 and the input/output IO pin 126, and the communication protocol follows the ISO/IEC7816 standard. Mobile communication device 9 provides reset signal to dual-interface SIM card 10 through reset pin RST122; The clock of dual-interface SIM card 10 work is provided by mobile communication device 9 through clock pin CLK123; Dual-interface SIM card 10 and mobile communication device 9 The data communicated serially between them is carried out through the IO pin 126. The spare pin NC127 is generally not used during normal operation.

(2) electronic wallet inside the dual-interface SIM card of the present invention

The e-wallet structure inside the dual-interface SIM card is determined by the card issuer at the time of issuance, and the specific format needs to match the entire radio frequency identification system of each card issuer. There are two ways to recharge the electronic wallet: one is directly transferred by the user from the account of the mobile communication device, and the other is to recharge through a special recharge center. There are two ways to set up the consumption of the electronic wallet: one is that the large amount of consumption can require the user to confirm or special account authentication, and the other is that the small amount of consumption can be automatically completed by the dual-interface SIM card and the reader.

The mobile communication network such as GSM/CDMA/3G/4G where the mobile communication device is located can monitor the progress of the transaction in real time, thus effectively linking the mobile communication network and the RFID payment network.

Considering the security of the system, everything related to the establishment of electronic wallets, recharging, and consumption requires mutual authentication between the dual-interface SIM card and the card issuer (when issuing) or the dual-interface SIM card and the reader (when recharging and consuming).

The electronic wallet part can adopt the existing technology, which will not be repeated here.

(3) Signal booster

The radio frequency identification system corresponding to the dual-interface SIM card using the SIM card chip of the present invention also includes a signal booster. The core of the signal booster is a signal booster chip, please refer to the introduction below.

Please refer to FIG. 7 for a schematic diagram of the internal structure of the signal booster of the present invention. The signal booster chip 5 includes a receiving circuit, a sending circuit and a power supply module 506, the receiving circuit includes a filter 501, a demodulation and amplification module 502, a digital quantization module 503, and the sending circuit includes a logic control module 504, a modulation module 505 .

Described receiving antenna 8 transmits the signal that described dual-interface SIM card 10 sends to signal intensifier 2 to the input end of described filter 501 first, after filtering by this filter, obtain the clean modulated signal to be demodulated . The output end of this filter 501 is connected with the input end of described demodulation amplification module 502, will carry out signal amplification after demodulation, then output to the input end of described digital quantization module 503, for digital quantization module 503 to carry out quantization deal with.

The filter 501 is composed of a band-stop filter and a band-pass filter, the band-stop filter is used to filter out the modulated wave signal and the carrier signal sent from the reader 1 to the signal booster, and the band-pass filter is used to pass through the dual-interface The modulated wave signal and carrier signal sent by the SIM card to the signal booster, the center frequency of the band-pass filter and the band-stop filter are consistent with the carrier frequency sent by the signal booster or reader to the signal booster, and the specific value depends on the chip of the signal booster It depends on the adopted ISO/IEC 14443 standard, ISO/IEC 15693 or ISO11784/ISO11785 standard. For example, when ISO/IEC 14443 or ISO/IEC 15693 standard is adopted, the carrier frequency is 13.56MHz, and when ISO11784/ISO11785 standard is adopted, the carrier frequency is 100-150kHz. The band stop filter and band pass filter can be but not limited to Chebyshev filter.

The demodulation and amplification module 502 is used to demodulate the ASK, FSK or PSK signal sent from the dual-interface SIM card to the signal booster, and adopts the non-coherent demodulation mode of diode detection.

The digital quantization module 503 uses an analog-to-digital converter (abbreviated as ADC) or a comparator (i.e. Comparator) circuit to convert the analog signal output by the demodulation and amplification module 502 into a digital signal, and outputs it to the logic control module 504 input.

The logic control module 504 is used to process the digital signal input by the digital quantization module 503 , and generate the required subcarrier control signal to be returned to the reader, and output to the input terminal of the modulation module 505 . The subcarrier signals generated by the logic control module 504 and the modulation module 505 are determined according to the ISO/IEC 14443 standard, ISO/IEC 15693 or ISO11784/ISO11785 standard adopted by the signal booster chip. For example, when the ISO/IEC 14443 standard is adopted, the subcarrier signal frequency is 847kHz; when the ISO/IEC 15693 standard is adopted, the subcarrier signal frequency is 423.75kHz or 484.28kHz (determined by the standard).

The modulation module 505 controls the insulated gate field effect transistor (MOS transistor for short) switch 5051 connected to both ends of the antenna by sending a high level or a low level, thereby changing the load current added to the transmitting antenna 7 and generating a subcarrier The reflected modulated signal returns to the reader 1 as described. When the modulation module 505 sends a high level, the MOS tube switch 5051 is turned on, and the transmitting antenna 7 forms a loop, so that a load current flows through, and a subcarrier reflected modulation signal is generated and returned to the reader 1 ; When the modulation module 505 sends a low level, the MOS tube switch 5051 is cut off, and the transmitting antenna 7 does not form a loop, so that no load current flows through, and the subcarrier reflection modulation signal will not be generated to return to the Reader 1.

When the signal booster chip 5 is working, the carrier energy sent by the reader 1 is directly taken by the transmitting antenna 7, and the power supply module 506 utilizes a bridge rectifier circuit to generate the energy needed for the signal booster chip 5 to work. The working power supply is used by the entire chip of the signal booster chip 5 .

The signal booster using the above-mentioned signal booster chip is introduced as follows.

Please refer to Figure 6 and Figure 7. Fig. 6 is a schematic diagram of the external structure of the signal booster of the present invention; Fig. 7 is a schematic diagram of the internal structure of the signal booster of the present invention.

The signal sending and receiving of the signal booster is realized by two antennas. The signal booster 2 includes: the signal booster 2 communicates with the reader 1, the signal booster 2 communicates with the receiving antenna 8 of the dual-interface SIM card 10, the signal booster chip 5, and the first antenna pin 51 . The second antenna pin 52 , the third antenna pin 53 , and the fourth antenna pin 54 .

The transmitting antenna 7 is connected to the first antenna pin 51 and the second antenna pin 52 of the signal booster chip 5 by a wire, and the receiving antenna 8 is connected to the signal booster by a wire The third antenna 53 and the fourth antenna pin 54 of the chip 5 .

The signal booster 2 is pasted on the reader 1 or the mobile communication device 9 for enhancing the response signal returned by the dual-interface SIM card 10 to the reader 1 .

The signal sent by the reader 1 is directly received by the dual-interface SIM card 10 in the mobile communication device 9, and the signal that the dual-interface SIM card 10 responds to the reader 1 is first sent to the described signal booster 2 and the dual-interface The receiving antenna 8 of the SIM card 10 communicates, after the signal booster chip 5 completes the signal enhancement, and then returns to the reader 1 through the transmitting antenna 7 with the frequency protocol consistent with the reader 1 .

In the corresponding radio frequency identification system, the modulation mode of communication between the dual-interface SIM card and the signal booster is ASK or FSK or PSK modulation, and the carrier frequency is 6.78MHz or 13.56MHz or 27.12MHz.

The signal booster 2 responds to the reader 1 with the same frequency and protocol as the frequency and protocol of the reader 1 communication, which can be but not limited to the ISO/IEC 14443 standard, or ISO/IEC 15693 or ISO11784/ISO11785 standard.

When the signal booster 2 is working, it directly uses the carrier energy sent by the reader 1 through the transmitting antenna 7 .

Due to the shielding effect of the mobile phone battery and the circuit board, the signal sent by the dual-interface SIM card 10 will be greatly attenuated after passing through the mobile phone environment. If there is no signal booster 2 to enhance the signal, the reader 1 will not be able to receive the dual-interface SIM card 10. Return If there is no response signal, the normal communication between the dual-interface SIM card 10 and the reader 1 cannot be realized. The signal booster 2 utilizes each module inside the signal booster chip 5 to effectively solve the above-mentioned problem of signal attenuation, realizes signal enhancement, and does not need to modify the mobile communication device where the reader and the dual-interface SIM card 10 are located.

(4) Radio frequency identification system corresponding to dual-interface SIM card

Please refer to FIG. 1 for a structural schematic diagram of the radio frequency identification system of the present invention.

The present invention applies the radio frequency identification system of above-mentioned dual-interface SIM card 10, comprises reader 1, background system 3, the communication interface 4 of this reader and background system, mobile communication device 9, and this radio frequency identification system also comprises dual-interface SIM card 10 and signal booster 2,

The dual-interface SIM card 10 is installed on the mobile communication device 9 .

The signal booster 2 is pasted on the reader 1 or the mobile communication device 9 for enhancing the response signal returned by the dual-interface SIM card 10 to the reader 1 .

The signal sent by the reader 1 is directly received by the dual-interface SIM card 10 in the mobile communication device 9, and the signal that the dual-interface SIM card 10 responds to the reader 1 is first sent to the signal booster 2 After the signal booster 2 completes the signal enhancement, it returns to the reader 1 with a frequency protocol consistent with the reader 1.

The signal sent by the reader 1 to the dual-interface SIM card 10 complies with the ISO/IEC 14443 standard, or the ISO/IEC 15693 standard, or the ISO11784/ISO11785 standard.

The modulation mode of the signal sent from the dual-interface SIM card 10 to the signal booster 2 is ASK, or FSK, or PSK modulation mode, and the carrier frequency is 6.78MHz or 13.56MHz or 27.12MHz. When using ASK, or FSK, or PSK modulation mode, it can be realized by existing widely used ASK, FSK or PSK modulation and demodulation circuits.

The communication standard from the signal booster 2 to the reader 1 is consistent with the communication standard from the reader 1 to the dual-interface SIM card 10, and also conforms to the ISO/IEC 14443 standard or ISO/IEC 15693 standard, or ISO11784/ISO11785 standard.

The mobile communication device 9 is a mobile phone using GSM, CDMA, 3G or 4G communication network.

In this system, the reader 1 is mainly for sending transaction commands and receiving responses, the dual-interface SIM card is mainly for receiving transaction commands and giving responses, and the signal booster is mainly for signaling between the dual-interface SIM card and the reader Relay and enhancement of . The signal sent by the reader 1 is directly received by the dual-interface SIM card 10 in the mobile communication device 9, and the signal that the dual-interface SIM card 10 responds to the reader 1 is sent to the said reader 1 with ASK or FSK or PSK modulation. The signal booster 2 of the device returns to the reader 1 after completing the signal boost.

The transmitting antenna 7 of the signal booster, in addition to being the communication channel between the reader 1 and the signal booster 2, also transfers carrier energy from the reader 1 to the protocol frequency processor 5 of the signal booster . Because of the energy transmission, the signal booster 2 can work passively without an external DC or AC power supply.

The communication interface 4 is used for the communication connection between the background system 3 and the reader 1, and provides background support required for RFID transactions. The communication interface 4 is a communication interface such as RS232 or Ethernet.

When the reader 1 operates the originally matching electronic tag, the tag is placed in the read-write area outside the reader's antenna signal booster 2 . When the reader 1 operates the dual-interface SIM card 10 in the mobile communication device 9, the mobile communication device 9 is placed on the signal booster 2, and the dual-interface SIM card 10 communicates with the reader 1 via the signal booster 2 and completes the transaction .

The signal returned by the dual-interface SIM card 10 to the reader 1 is enhanced by the signal booster 2, so that the reader 1 and the mobile communication device 9 do not need to be modified, which effectively expands the application range of the system and reduces the capital and time investment of system research and development.

The workflow of the radio frequency identification system of the present invention is as follows:

1) Paste the signal booster 2 on the reader 1 of the existing reader system;

2) If you want to operate the original electronic tag matching the frequency and protocol of the reader 1, put the tag in the reading and writing area outside the reader antenna signal booster 2, and complete the transaction according to the normal process;

3) If the dual-interface SIM card 10 in the mobile communication device is to be operated, the mobile communication device 9 is placed on the signal booster 2;

4) The command sent by the reader 1 is directly received by the dual-interface SIM card 10 in the mobile communication device 9, and the signal answered by the dual-interface SIM card 10 is first sent to the signal booster 2 in ASK, FSK or PSK modulation mode, and the After the booster 2 completes the signal enhancement, it returns to the reader 1 with the same frequency protocol as the reader 1;

5) At the end of the transaction, the reader 1 gives an audible and visual signal to remind the user;

6) The user takes away the mobile communication device 9 with the dual-interface SIM card 10 after being prompted for the end of the transaction;

7) After the signal booster 2 finds that the mobile communication device 9 has left, it performs data clearing and waits for the start of the next transaction.

Due to the bridge function of the dual-interface SIM card, the present invention can effectively connect mobile communication networks such as GSM/CDMA/3G/4G where the mobile communication device is located with the RFID payment network, thereby more effectively realizing non-contact short-distance radio frequency identification .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the content of the patent scope of the present invention shall be within the technical scope of the present invention.

Claims (10)

1. A dual-interface SIM card (10), comprising a SIM card base (13), a contact card metal contact (14) and a contactless antenna (11), is characterized in that: The dual-interface SIM card (10) also includes a SIM card chip (12) embedded in the SIM card base (13); The non-contact antenna (11) of the dual-interface SIM card (10) is directly embedded in the SIM card base (13), and the two ends of the non-contact antenna (11) are connected to the SIM card respectively. On the first antenna pin ANT ₁ (124) and the second antenna pin ANT ₂ (125) of the chip (12). 2. The dual-interface SIM card according to claim 1, characterized in that the communication protocol between the dual-interface SIM card (10) and the mobile communication device (9) where it is located complies with the ISO/IEC7816 standard. 3. The dual-interface SIM card according to claim 1, characterized in that the signal sent to the dual-interface SIM card (10) by the reader (1) conforms to the ISO/IEC 14443 standard, or the ISO/IEC 15693 standard , or ISO11784/ISO11785 standard. 4. The dual-interface SIM card according to claim 1, 2 or 3, characterized in that the plane where the non-contact antenna (11) is located is parallel to the plane where the SIM card chip (12) is located . 5. The dual-interface SIM card according to claim 1, 2 or 3, characterized in that the plane where the non-contact antenna (11) is located is parallel to the plane of the SIM card base (13). 6. A radio frequency identification system applying the dual-interface SIM card described in claims 1 to 5 above, comprising a reader (1), a background system (3), the communication between the reader (1) and the background system (3) Interface (4), mobile communication equipment (9), it is characterized in that this radio frequency identification system also comprises dual-interface SIM card (10) and signal booster (2), The dual-interface SIM card (10) is installed on the mobile communication device (9), The signal sent by the reader (1) is directly received by the dual-interface SIM card (10) in the mobile communication device (9), and the signal that the dual-interface SIM card (10) responds to the reader (1) First send to the signal booster (2), after the signal booster (2) completes the signal enhancement, then return to the reader (1) with a frequency protocol consistent with the reader (1) . 7. The radio frequency identification system according to claim 6, characterized in that the signal booster (2) is pasted on the reader (1) or the mobile communication device (9) to enhance the dual interface The SIM card (10) returns the response signal of the reader (1). 8. The radio frequency identification system according to claim 6, characterized in that the signal modulation method sent to the signal booster (2) by the dual-interface SIM card (10) is ASK or FSK or PSK modulation method, and the carrier frequency is 6.78MHz or 13.56MHz or 27.12MHz. 9. The radio frequency identification system according to claim 6, characterized in that the communication standard from the signal booster (2) to the reader (1) is the same as that from the reader (1) to the The communication standards of the dual-interface SIM card (10) are consistent, and also comply with the ISO/IEC 14443 standard, or the ISO/IEC 15693 standard, or the ISO11784/ISO11785 standard. 10. The radio frequency identification system according to claim 6, characterized in that said mobile communication device (9) is a mobile phone using GSM, CDMA, 3G or 4G communication network.

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