1, when speaking as an antenna, is the quality factor;
2, as programming: When the reader wants to read and write the tag, the reader first sends a Query command to all the tags. The command contains a parameter Q (Q is an integer between 0 and 15). After receiving this command, the tag in the reader's RF field will generate a random number between 0~21Q− as its response time slot, and load this random number into the time slot counter. Only the tag with the time slot of 0 in the slot counter will send RN16 (16-bit random number) to the reader as the response information.