Hi @chenyuxiang
welcome to this community.
English is the official language of the community. English will give to your post more visibility and make it easy to understand for all ST Community members and experts.
Therefore, I would suggest to edit your post and translate it to English.
Proposal:
Title: Inconsistant performances of ST25R3911B
Content:
hello! ST official, I use ST25R3911B chip for NFC identification solution;
I made 5 boards with the same circuit, and found that the performance of the antenna in identifying NFC tags was inconsistent;
1. Board No. 1 can recognize NFC tags normally;
2. Board No. 2 cannot recognize labels normally and needs to adjust the matching circuit parameters, and the parameters adjusted by the two boards are inconsistent;
3. Adjust the parameters of board No. 1 to the parameters of board No. 2. Board No. 1 cannot be recognized and does not work properly;
4. The same applies to the rest of the boards. The adjustment parameters are inconsistent in order to work properly.
Please tell me, gentlemen, what is the reason for this?
It's all the same circuit.
Rgds
BT
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