Development of insensitive RFID tag for variation of chip impedance

This paper presents develop of insensitive RFID tag independent about variation of chip impedance. Designed tag antenna is operate at 900MHz bands, and it's performances is maintained when reactance of the chip is changed. If chip reactance changes from -J80 ~ -J270 ohm, this tag takes -10 dB bandwidth in 900 MHz bands. Moreover we confirmed that this tag antenna has ability to use commercial chip model.