Design of RFID near-field focusing circular patch array antenna at 2.4GHz with applications

Author

Liu, Hsien-Wen ; Weng, Chung-Hsun ; Yang, Chang-Fa ; Lin, Yu-Shu ; Chen, Fu-Syuan ; Huang, Yu-Cheng ; Hsu, Che-Wei

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan

fYear

2010

fDate

Nov. 29 2010-Dec. 1 2010

Firstpage

1

Lastpage

4

Abstract

In this paper, a planar circular patch array antenna that features electric fields focused in the near-field zone for 2.4 GHz radio frequency identification (RFID) applications is presented. This array antenna is implemented by using six circular patch elements and a microstrip feeding network with a proper input phase for each element. The array antenna is capable of enhancing electric field distributions in the near zone to charge and interrogate dipole-like passive tags near the array antenna by capacitive coupling. Readable range is measured for up to 12 tags lined up closely with 1 cm spacing. Applications using the proposed array antenna with an RFID reader by Sunlit are discussed.

Keywords

UHF antennas; microstrip antenna arrays; planar antenna arrays; radiofrequency identification; RFID near field focusing circular patch array antenna; RFID reader; dipole like passive tags; electric field distributions; frequency 2.4 GHz; microstrip feeding network; planar circular patch array antenna; Antenna arrays; Antenna feeds; Arrays; Dipole antennas; Electric fields; Focusing; Radiofrequency identification; RFID; circular patch array antenna; mutual coupling; near-field UHF reader antenna; near-field focusing;

fLanguage

English

Publisher

ieee

Conference_Titel

Internet of Things (IOT), 2010

Conference_Location

Tokyo

Print_ISBN

978-1-4244-7413-4

Type

conf

DOI

10.1109/IOT.2010.5678442

Filename

5678442