An UHF RFID Circularly Polarized Tag Antenna With Long Read Distance for Metal Objects

被引：7

作者：

Wang, Ping ^{[1
,2
]}

Luo, Wei ^{[1
,2
]}

Shao, Yu ^{[1
,2
]}

Jin, Haiyan ^{[3
]}

机构：

[1] Chongqing Univ Posts & Telecommun, Minist Educ, Chongqing Key Lab Mobile Commun Technol, Engn Res Ctr Mobile Commun, Chongqing 400065, Peoples R China

[2] Chongqing Univ Posts & Telecommun, Sch Commun & Informat Engn, Chongqing 400065, Peoples R China

[3] Univ Elect Sci & Technol China, Inst Aeronaut & Astronaut, Chengdu 611731, Peoples R China

来源：

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2022年 / 21卷 / 02期

关键词：

Antennas; UHF antennas; Antenna measurements; Impedance; Electronic countermeasures; Radiofrequency identification; Receiving antennas; Circular polarization (CP); high gain; metal-attachable; tag antenna; DESIGN; PROBE;

D O I：

10.1109/LAWP.2021.3122871

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this letter,a circularly-polarized (CP) metal-tolerant tag antenna with a long reading distance (RD) is proposed for the ultra-high frequency (UHF) radio-frequency identification (RFID) systems. In order to realize CP radiation and high gain, a cross slot is etched on top patch to provide two orthogonal polarizations, whereas the meandered strip on the central copper layer is used to obtain a 90 degrees phase difference between adjacent ports. An equivalent circuit model is established to better understand the operating mechanism and impedance characteristic. A prototype mounted on a 200 mm x 200 mm metal plate has been manufactured and measured to verify the design and shows an impedance bandwidth of 8 MHz (918-926 MHz) and axial ratio bandwidth of 1.3 MHz (921.6-922.9 MHz). Also, a maximum gain of 2 dBi at 922 MHz and a maximum RD of about 22.4 m have been demonstrated.

引用

页码：217 / 221

页数：5

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