Antenna gain method of near field communication (NFC) reader-writer

Abstract

The invention discloses an antenna gain method of a near field communication (NFC) reader-writer. According to the method, a card enquiry gain process is added to a card enquiry process of the NFC reader-writer. According to the card enquiry process, a plurality of times of rated gain card enquiry and one time of high gain card enquiry are carried out first, and if a response is given to the rated gain card enquiry, rated gain is set and follow-up interaction is carried out afterwards; and if a response is given to the high gain card enquiry, a reset gain judgement is carried out before high gain is set, and then the follow-up interaction is carried out. A reader-writer using the method is capable of reading an ordinary card normally in the nine times of rated gain card enquiry, and when the ordinary card is put in when the one time of high gain card enquiry is carried out, the high gain card enquiry can be automatically converted to the rated gain card enquiry; and the reader-writer can not read a small special-shaped card normally in the nine times of rated gain card enquiry and can read the small special-shaped card normally in the one time of high gain card enquiry, and the high gain can be maintained normally so as to be applied to the follow-up interaction of the card. The antenna gain method of the NFC reader-writer has a good effect on solving the problems of reading of a small antenna and an object with metal like a mobile with a payment function by a non-connect-type reader-writer.

Description

technical field [0001] The invention relates to a gain method of a wireless radio frequency card reader, more specifically an antenna gain method of an NFC reader. Background technique [0002] NFC readers / smart card readers and appliances with card reader functions such as POS machines are mostly due to limitations in appearance, structure and internal space, and the antenna area of ​​non-contact card readers cannot be made large enough, which directly affects Card reader performance. On the other hand, there are a large number of special-shaped cards on the market. These cards are packaged into various odd-shaped ornaments, and the general card antenna area is small. Some of these special-shaped cards are too small in size or have a deviation in response frequency, which may be difficult to recognize when used on our POS machine card reader. And with the gradual maturity of mobile payment technology, more and more mobile phone cards with payment function (based on NFC te...

AI Technical Summary

Problems solved by technology

However, simply increasing the antenna gain will reduce the anti-interference ability of the antenna, making the communication vulnerable to external micro-interference and making the communication unstable, making those ordinary cards whose standard conforms to ISO / IEC 14443-1 size may also cause instability and affect reading. Card overall performance and stability

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