We developed an RFID module based on the Mifare RC522 (Mifare RFID Reader/Writer 13.56MHz RC522 SPI [3901] : Sunrom Electronics/Technologies). The schematic of the circuit is shown below. We have taken some measures and we can highlight those carried out in points 1, 2 and 3. We noticed that the signal was attenuated. So I would like to know if this could have happened due to a possible difference in the MFRC522 registers or due to the physical characteristics of the antenna design (our antenna is a bit bigger, which can generate a difference in antenna impedances).
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Mifare RC522 and Our project, same signal
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Mifare RC522 Our project
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Mifare RC522 Our project
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