The signal from RFO1 and RFO2 can not pass over the matching circuit.

[Lchan.1]

I am developing an RFID system that is capable to read a passive tag(M24LR04E) about 30cm

My antenna design chose Molex 1462360031 and the reader IC is ST25R3915. I use the matching circuit tool as the circuit reference but the signal did not pass over the 220pF capacitor. Therefore no signal could pass to the antenna. Is there any ST25R3915 matching design that is work?

[Ulysses HERNIOSUS]

Hi,

as ST25R3915 belongs to the ST25R3911B family, please use the information available on ST25R3911B. ST25R3916 is a different (albeit similar) family.

Please also refer to AN4974: Antenna matching for ST25R3911B/ST25R391x devices.

If you need more assistance, please provide more information about your measurements and its setup.

Best Regards, Ulysses