SD card and RF signal amplification device based on double-interface smart card chip

Abstract

The embodiment of the invention discloses an SD card and an RF signal amplification device based on a double-interface smart card chip, and the SD card supports contact and non-contact SD card application, comprising an RF antenna, a double-interface smart card chip and an SD card chip; wherein a signal amplification circuit which can enhance RF signals of the RF antenna is disposed between the RF antenna and the double-interface smart card chip, and RF signals induced by the RF antenna are transferred to the double-interface smart card chip after being amplified by the signal amplification circuit; and in order to enhance RF signals, a layer of ferromagnetic material can be additionally disposed inside the SD card, strengthening magnetic flux density of the SD card region. The embodiment of the invention can apply a double-interface smart card chip to an SD card, and can combine an RF antenna and an SD card into a whole without changing SD size, enabling the SD card to have non-contact function, and have no difference compared with a normal SD card in terms of usage and appearance.

Description

technical field [0001] The invention relates to the technical field of databases, in particular to an SD card, a radio frequency signal amplification device and a mobile terminal realized based on a dual-interface smart card chip. Background technique [0002] Radio frequency identification technology (Radio Frequency Identification, RFID) transmits energy and data through magnetic or electromagnetic fields, and uses radio frequency to achieve non-contact two-way communication. Because radio frequency identification technology does not require direct contact and is flexible and quick to operate, it is widely used in transportation, logistics, medical care, finance and other fields. In the field of smart cards, the use of contact smart cards will cause corrosion and wear of the contact points, resulting in a reduction in the service life of the smart card, and the communication efficiency of the contact card is low, the response time is long and other shortcomings, which are ...

AI Technical Summary

Problems solved by technology

[0005] In order to obtain enough magnetic field for the contactless smart card working at 13.56MHz, the size of the antenna coil is generally large, which completely exceeds the size of the SD card, let alone the MiniSD card. If the size of the antenna coil is simply reduced, the current contactless The application of the radio frequency technology on the smart card in the SD card will cause insufficient mutual inductance of the antenna coil between the contactless SD card and the reader, which cannot meet the actual needs

[0006] If the SIMPass solution is adopted, since the SD card is generally connected to the side of the mobile phone, it is impossible to build the antenna and the SIM card into the mobile phone like SIMPass. It will make it difficult for users to operate, and the external antenna is easy to break, affecting the use

Moreover, the radio frequency signal with a working frequency of 13.56MHz cannot pass through metal materials. It is unrealistic to restrict mobile phones with SD card slots to non-metal products.

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