UHF/UWB Tag Antenna of Circular Polarization

作者：Gao Xiang^*; Shen Zhongxiang

来源：IEEE Transactions on Antennas and Propagation, 2016, 64(9): 3794-3802.

DOI：10.1109/TAP.2016.2583547

• Circularly polarized (CP) antenna
• dual-band tag antenna
• ultrahigh-frequency (UHF)
• ultrawideband (UWB)

A dual-band circularly polarized (CP) tag antenna is presented in this paper, which combines ultrahigh-frequency (UHF) and ultrawideband (UWB) operations for radio-frequency identification (RFID) and high-precision localization applications. The proposed antenna consists of two CP radiating elements with separated ports, where the UHF element is a planar loop antenna loaded with two pairs of meander lines of different dimensions for compactness and CP radiation, while the UWB element is a modified Archimedean spiral antenna with a tapered metallization ratio and encircled by the UHF loop. In addition, a miniaturized shunt-stub is employed in the UHF element to realize conjugate matching between the antenna and the UHF RFID chip. Experimental characterization of a fabricated prototype has validated the design, which shows that the proposed antenna exhibits very good radiation performance at both the bands, with -10 dB power reflection bandwidths of 0.86-0.975 GHz and 2.6-12 GHz, and 3 dB axial-ratio bandwidths of 0.911-0.938 GHz and 3.1-11.1 GHz, respectively. This antenna can find applications in RFID and indoor positioning systems.

• 出版日期2016-9