Fig. 6 shows the simulated andmeasuredPRCcurvesoftheimplementedantennas,andthe bandwidths are found to be 6.02% (890–945 MHz) and 6.05% (898–954 MHz), respectively. We note, from the simulated and measured results presented in Fig. 6, that the approximate resonant frequency of the tag is 926 MHz, which is higher than the