Device and method for improving performance consistency of radio frequency sim cards in different mobile phones
A consistent and high-performance technology, applied to the structure of telephone sets, electrical components, transmission systems, etc., can solve the problems of impedance matching deterioration, affecting the compatibility of RF SIM card mobile phones, affecting signal transmission and reception, etc., to reduce the impact of wireless communication performance Effect
Active Publication Date: 2015-09-30
SHANGHAI QUANRAY ELECTRONICS
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Problems solved by technology
[0006] When the inductance value of the antenna 101 changes, by The determined resonant frequency changes, resulting in RF SIM cards that meet the resonance conditions in some mobile phones. In other mobile phones, the impedance matching deteriorates sharply, which seriously affects signal transmission and reception.
Eventually, when the radio frequency SIM card is used in different mobile phones, the performance consistency becomes poor, which affects the mobile phone compatibility of the radio frequency SIM card
Method used
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention should not be limited thereby.
[0032] In a radio frequency SIM card system, the antenna 101 is most sensitive to the external environment. Assuming an ideal environment, the basic inductance value of the antenna is L 0 , then, when the environment of the mobile phone changes, the inductance value of the antenna can be expressed as L=L 0 (1+β 1 ), where β 1 ∈[-0.25,0.5].
[0033] In a specific application, due to the user changing the mobile phone, the inductance L of the antenna 101 changes twice, and the capacitor C in the matching network circuit 107 needs to have a corresponding change range of more than twice to compensate for the change in the antenna inductance . The reference value of the recording capacitance is C 0 , capacitance value C=C 0 (1+β2), β 2 ∈[-0.5,0.7]. In this spec...
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A device for improving the performance consistence of a radio frequency SIM card in different mobile phones comprises an antenna and a non-contact front end chips which are called a CLF chip and a safety module chip for short. The device is characterized in that the CLF chip comprises a radio frequency radiating circuit, an impedance matching network and a voltage amplitude detection and judgment circuit are additionally provided, the voltage amplitude detection and judgment circuit detects the amplitude of outer signals of the radio frequency radiating circuit, and the impedance matching network is composed of equivalent capacitors. The impedance matching network formed in a capacitor array mode is added to the CLF chip, the automatic detection circuit is added, through detection on the amplitude of powered emitted signals, a network parameter corresponding to the maximum amplitude value serves as a final parameter, the radiating power of radio frequency radiation circuits in the different mobile phones is adjusted to the maximum, and therefore the influence on the wireless communication performance of the radio frequency SIM card from variation of the mobile phone environment is lowered.
Description
technical field [0001] The invention relates to a radio frequency SIM card, in particular to a method for improving the performance consistency of the radio frequency SIM card in different mobile phones. technical background [0002] Mobile phone radio frequency SIM card is a kind of SIM card capable of mobile payment. It not only has the function of SIM card, but also realizes short-distance wireless communication. It can integrate functions such as bus cards, bank cards and access control cards to pay for some daily services and facilitate citizens to travel and shop. In recent years, mobile phone radio frequency SIM cards have developed very rapidly in China. Following the 2.4G payment card launched by China Mobile, operators and UnionPay have now launched a series of 13.56MHz radio frequency SIM cards. [0003] Such as figure 1 As shown, a radio frequency SIM card for a mobile phone generally includes three parts: an antenna 101 , a contactless frontend (CLF for short)...
Claims
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IPC IPC(8): H04B1/40H04M1/02H04B1/3816
Inventor 任文亮车文毅
Owner SHANGHAI QUANRAY ELECTRONICS