Flexible microwave chipless tag system based on DGS resonators

摘要

In this paper, a flexible microwave tag system using a frequency-scanning type RFID is proposed with multi-resonators based on defected ground structures. While a conventional chip-based tag stores time-sequential codes, the proposed one achieves pure passive tags by using multi-resonant bit over a wide frequency range. Moreover, the resonator of the spiral-shaped defected ground structure implemented on the back side of transmission lines has advantages of the excellent band notch characteristics as well as the bit-error avoidance by the re-radiation occurred on normal resonators. The proposed microwave tag is designed and implemented with UWB antennas at 3–7 GHz on the thick FR4 and thin flexible polyimide substrates, respectively. From the experimental results in an anechoic chamber, it has been verified of the excellent recognitions for various 5-bits identification codes.