paper 140319073436

A passive radio frequency identification (RFID) tag antenna with circular polar- ization (CP) radiation is proposed to operate at 902–928 MHz and mount on metallic surfaces. A U-shaped terminal short-circuited feedline welded to a tag-chip is embedded in a rectangular slot to achieve a coupled feeding and a good impedance matching. By employing two truncated corners and two L-shaped slots with unequal length on the patch, a good left-hand circular polarization (LHCP) and compact size are obtained. The measured impedance bandwidth of the antenna is 85 MHz (875–960 MHz), while the simulated 3-dB CP bandwidth is 6 MHz (912– 918 MHz). The proposed tag antenna shows reasonable read ranges when mounted on the metal plate in the following experiment.

Citation

Zhibin He, Sailing He, Hui Liu, Te Pan, and Shuai Zhang, "Compact Circularly Polarized RFID Tag Antenna with an Embedded U-shaped Feedline for Metallic Surfaces," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1567-1571

References

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