Optimization of UHF RFID tag antennas using a genetic algorithm

UHF band (860/spl sim/960 MHz) RFID tag strip-line antennas for non-metallic object and slotted patch RFID antenna for metallic objects have been optimized with a GA. The antennas are optimized for commercially available RFID tag IC chips. Different cell sizes of FDTD have been tried while the GA optimizes the symmetrical shape of RFID antennas.