Circularly Polarized UHF RFID Tag Antenna for Wireless Sensing of Complex Permittivity of Liquids
Circularly Polarized UHF RFID Tag Antenna for Wireless Sensing of Complex Permittivity of Liquids
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DOI：
10.1109/jsen.2021.3121714
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发表时间：
2021-12-01
影响因子：
4.3
通讯作者：
Shen, Zhongxiang
中科院分区：
文献类型：
--
作者：
Chen, Yi;Hua, Changzhou;Shen, Zhongxiang
提出了一种基于互补开口环谐振器（CSRR）的超高频RFID标签圆极化天线。它的工作频率随着所提出的天线内部注入的液体而变化，该天线由3D打印技术制造。基于这一特征，通过测量读取范围，可以在距读取器天线一定距离处无线地提取被测液体的复相对介电常数。然后从具有最大读取范围的频率和两个相邻频率点提取液体的复介电常数的真实的实部和虚部，在所述两个相邻频率点处，读取范围相关参数是其最大值的90%。所提出的天线的圆极化是通过一对CSRR实现的，用于实现相对较大的读取范围和减小天线尺寸。根据测量结果，可以在距离1.97 m的阅读器上提取出真实的部分在1 ~ 81之间的液体的复相对介电常数。
This paper presents a compact circularly polarized UHF RFID tag antenna based on complementary split ring resonator (CSRR). Its operating frequency varies with the injected liquid inside the proposed antenna, which is fabricated by 3D printing technology. Based on this feature, the complex relative permittivity of the liquid under test can be extracted wirelessly at a distance from the reader antenna by measuring the read range. The real and imaginary parts of the complex permittivity of the liquid are then extracted from the frequency with the maximum read range and two neighboring frequency points, at which a read range related parameter is 90% of its maximum value. The circular polarization of the proposed antenna is realized by a pair of CSRRs for achieving a relatively large read range and miniaturizing the antenna size. According to the measurement results, the complex relative permittivity of liquids with real part between 1 and 81 can be extracted from a reader with the distance up to 1.97 m.