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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Embodiment 1
[0061] Embodiment one: if 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] The communication terminal module 2 has the first function: to provide power to the SIM module 1 through electromagnetic coupling, and the second function: to send the CLK level signal, RESET level signal and IO level signal to the SIM module 1 by wireless means 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 - GSM sub-module 21 , - power transmission sub-module 22 , - data transmission direction detection sub-module A 24 , - wireless transceiver sub-module A 23 . in:
[0063] - The GSM s...
Embodiment 2
[0091] Embodiment two: if Figure 8 Shown, a kind of communication method of SIM card wireless communication system, take 3.25MHz CLK clock signal as example, comprise the following steps:
[0092] S1. The power sending sub-module of the communication terminal module 2 wirelessly transmits the generated power to the power receiving sub-module 12 after processing. Step S1 comprises 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 realized by a signal generating circuit. specific:
[0094] A 13MHz clock signal is generated by a 13MHz active crystal oscillator in the power sending sub-module 22, and the generated clock signal is divided by 4 to obtain a 3.25MHz AC signal in the form of power.
[0095] S102 , amplify the power of the AC signal, which is realized by the signal amplifying circuit 222 . specific:
[0096] A signal amplifying circuit 222 with class E powe...
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