A Universal UHF RFID Reader Antenna

Author

Chen, Zhi Ning ; Qing, Xianming ; Chung, Hang Leong

Author_Institution

Inst. for Infocomm Res., Singapore

Volume

57

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

1275

Lastpage

1282

Abstract

A broadband circularly polarized patch antenna is proposed for universal ultra-high-frequency (UHF) RF identification (RFID) applications. The antenna is composed of two corner-truncated patches and a suspended microstrip line with open-circuited termination. The main patch is fed by four probes which are sequentially connected to the suspended microstrip feed line. The measurement shows that the antenna achieves a return loss of -15 dB, gain of 8.3 dBic, axial ratio (AR) of 3 dB, and 3-dB AR beamwidth of 75^deg over the UHF band of 818-964 MHz or 16.4%. Therefore, the proposed antenna is universal for UHF RFID applications worldwide at the UHF band of 840-960 MHz. In addition, a parametric study is conducted to facilitate the design and optimization processes for engineers.

Keywords

UHF antennas; broadband antennas; microstrip antennas; microstrip lines; polarisation; radiofrequency identification; bandwidth 818 MHz to 964 MHz; broadband circularly polarized patch antenna; loss -15 dB; open-circuited termination; suspended microstrip line; universal UHF RFID reader antenna; Axial ratio (AR); RF identification (RFID); broadband antenna; circularly polarized (CP); sequential feed; ultra high frequency (UHF);

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2009.2017290

Filename

4806172