Wireless communication system of SIM (Subscriber Identity Module) card and communication method thereof
A technology of a wireless communication system and a communication method, applied in the SIM card wireless communication system and the communication field thereof, can solve the problems of connection failure, weakening the reliability and stability of the connection between the SIM card and the communication terminal equipment, and easily damaged contacts, etc. The effect of improving reliability, improving service life and strong anti-interference ability
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[0061] Example one: such as figure 1 As shown, a SIM card wireless communication system includes a SIM module 1 and a communication terminal module 2, wherein the SIM module 1 and the communication terminal module 2 communicate through a wireless connection.
[0062] Communication terminal module 2, the first function is: to provide power to the SIM module 1 through electromagnetic coupling, and the second function: to send the CLK level signal, the RESET level signal and the IO level signal to the SIM module 1 wirelessly to realize information Transmission from the communication terminal module 2 to the SIM module 1; at the same time, it is used to receive the level signal of the IO pin of the SIM card 11 wirelessly sent by the SIM module 1. The communication terminal module 2 is provided with a GSM sub-module 21, an electric energy transmission sub-module 22, a data transmission direction detection sub-module A 24, and a wireless transceiver sub-module A 23. among them:
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Example Embodiment
[0091] Embodiment two: such as Figure 8 As shown, a communication method of a SIM card wireless communication system, taking a 3.25MHz CLK clock signal as an example, includes the following steps:
[0092] S1, the power transmission sub-module of the communication terminal module 2 processes the generated power and wirelessly transmits it to the power receiving sub-module 12. Step S1 includes the following steps:
[0093] S101. Generate an AC signal in the form of electric energy with the same frequency as the clock signal of the SIM card, which is implemented by a signal generating circuit. specific:
[0094] In the power transmission sub-module 22, a 13 MHz clock signal is generated through a 13 MHz active crystal oscillator, and the generated clock signal is subjected to a 4-frequency division process to obtain an AC signal in the form of 3.25 MHz power.
[0095] S102. Amplify the power of the AC signal, which is implemented by the signal amplifying circuit 222. specific:
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