I am trying to design a receiver circuit which can detect and retrieve information from RFID Tags which operate at different frequencies, namely 124 KHz, 128 KHz and 134.2 KHz. I need to design a receiver circuit which can detect tags of those 3 frequencies and retrieve information from it.(Basic RFID receiver but instead of 1, I need to detect tags of 3 different frequencies). Can anyone suggest any material, links or correct me if I am wrong, I believe it's possible right? Thanks in advance.