ST25R95 Antenna Matching Circuit Review

Hi,

I'm testing a ST25R95 with a Molex 146236-2131 Antenna.

The Antenna Specs (per Molex) are

Using the ST25R95_EMI_FILTER_CALCULATION spreadsheet I substituted La and Ra to produce the following Antenna Matching Circuit.

C01 and C02 are 200pF,

L01 and L02 are 0.56uH

C11 and C12 are 0.57pF

C2 is 3.5 pF

R01 and R02 are 330R.

I've breadboarded the circuit and it works, but the range is less than I had hoped.

Can someone check my work and tell me if I've missed anything?

Thanks

This topic has been closed for replies.

Technical Moderator

Hi,

which tag technology do you use (NFC-A, B, F and/or V)? and what is the tag antenna size? Credit card format?

What is the read range for the various technologies (A/B/F/V)? Can you compare with X-NUCLEO-NFC03A1 reference board for the same tags?

Rgds

BT

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