Single antenna tuning circuit used for near field communication equipment

Abstract

A single antenna tuning circuit used for near field communication equipment with plural application modules, comprising a matching unit that connects a communication module and an antenna, to thereby input and output signals via the antenna; a first communication unit in correspondence to one of the plural application modules, being connected with the matching unit, to thereby input or output a signal via the antenna; a second communication unit in correspondence to another one of the plural application modules, being connected to the matching unit, to input or output a signal via the antenna;and an isolating unit that isolates the first and second communication units. The isolating unit is used for isolating the communication units, to further isolate each application module of near file d communication equipment connected to the communication unit electrically, to thereby simply a structure of the tuning circuit and reduce a dimension requirement of near field communication equipmentwith the antenna tuning circuit with one same antenna.

Description

technical field [0001] The invention relates to an antenna tuning circuit of a near-field communication device, in particular to a single-antenna tuning circuit in which multiple communication modules of the near-field communication device can share the same antenna. Background technique [0002] In recent years, electronic payment services have penetrated into people's lives and brought many conveniences. This digital consumption method replaces the traditional currency delivery, which greatly alleviates a series of social problems such as waiting in line. Since 2006, with the publicity and promotion of Near Field Communication (NFC) technology, more and more consumers use NFC devices for this emerging consumption mode, leading the trend of the times. [0003] In NFC devices, chip manufacturers integrate application modules such as contactless card readers (PCDs) and contactless cards (PICCs) into an NFC single chip. Correspondingly, the integration level of NFC devices i...

AI Technical Summary

Problems solved by technology

This antenna system architecture requires special design of two antennas, and the relative position of each NFC device antenna needs to be adjusted, resulting in poor product performance consistency.

In addition, because the two antennas cannot be completely overlapped, the area occupied by the antenna system is too large, and the integration level is not high, so there are structural difficulties for small NFC devices.

If one antenna is used directly, the PCD circuit and PICC circuit inside the NFC chip will inevitably affect each other through the tuning circuit, thereby reducing the overall performance and even making the NFC device extremely unstable.

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