At present, the common bus card protocol is iso 14443a, and the communication frequency is 13.56mhz. Tags with the same protocol and frequency will interfere with the bus card. For example, if the library card and bus card of 14443a are stacked together, there will be conflicts, and neither card can be read. But as long as they are separated, they can be read. This is different from the previous magnetic card. Many RFID cards will not fail if they are put together for a long time.

If it is an UHF RFID tag, it will not interfere with the bus card, but the metal parts of the two antennas will have shielding effect, which may affect the performance. If the bus card can be swiped by 5cm, but the UHF tag is attached, it may only be swiped by 2cm.