RFID antenna size minimization using double-layer periodic structures

In this paper, we explored the possibility of using multilayer periodic structures to reduce the RFID antenna size while maintaining the required performance. Specific designs are laid out with two double-layer structures with L-C and L-L setups, respectively. As compared to a normal single-layer dipole, the new structures results in large size reductions while maintaining the self resonance and self tuned features. With the meander line shaping, the double- layer dipoles can be easily reduced by 50% without losing the performance requirements.