Dual-Band UHF-RFID/WLAN Circularly Polarized Antenna for Portable RFID Readers

被引：83

作者：

Caso, R. ^{[1
]}

Michel, A. ^{[1
]}

Rodriguez-Pino, M. ^{[2
]}

Nepa, P. ^{[1
]}

机构：

[1] Univ Pisa, Dept Informat Engn, Pisa, Italy

[2] Univ Oviedo, Dept Elect Engn, E-33203 Gijon, Spain

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2014年 / 62卷 / 05期

关键词：

Circularly polarized antennas; dual-band antennas; inverted-F antenna; RFID portable reader; UHF-RFID reader antennas;

D O I：

10.1109/TAP.2014.2303971

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：

A compact, low-profile, two-port dual-band circularly polarized (CP) antenna for portable RFID readers is presented. The radiating element for the UHF-RFID band (902-928MHz) has been realized through a circular array of four inverted-F meandered monopoles, where the array elements are excited with a 90 degrees phase offset (sequential rotation feeding technique) through a microstrip feeding network. In order to also provide the portable reader with a wireless web access, a miniaturized CP patch has been added for the WLAN IEEE 802.11b, g radio link, by exploiting the available space between the four array elements, without increasing the overall antenna volume. The meandered monopoles and the patch are both etched on the same layer of an FR4 substrate, so getting a significant antenna compactness. (60 mm X 60 mm X 7 mm). The patch loading effect on the monopoles can be compensated by adjusting the meandered monopole length. Reflection coefficient, port isolation, axial ratio and radiation patterns are evaluated by numerical simulations and compared with measurements on an antenna prototype.

引用

页码：2822 / 2826

页数：6

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