Directly-fed single-layer wideband RFID reader antenna

Author

Pan, Yongping ; Zheng, Lei ; Liu, H.J. ; Wang, Jia ; Li, RongLin

Author_Institution

Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China

Volume

48

Issue

11

fYear

2012

Firstpage

607

Lastpage

608

Abstract

A wideband circularly-polarised (CP) antenna with a simple structure is proposed for universal ultra-high frequency (UHF) radio-frequency identification (RFID) reader applications. The antenna is composed of two patches, an L-shaped ground and an SMA connector. The main patch which is truncated to generate CP radiation is fed directly by the SMA connector oriented in the same plane via the vertical part of the L-shaped ground. The parasitic patch used to enhance the bandwidth is placed at the same layer of the main patch. These two schemes realised a directly-fed single-layer structure. The 3 dB axial ratio bandwidth and impedance matching bandwidth for 14 dB return loss overlap within the universal UHF RFID band (840 960 MHz), while high gain with an average level of 7.3 dBi is achieved. Simulation and measurements are in good agreement.

Keywords

UHF antennas; antenna feeds; broadband antennas; impedance matching; radiofrequency identification; CP antenna; L-shaped ground; SMA connector; UHF RFID reader applications; axial ratio bandwidth; directly-fed single-layer structure; directly-fed single-layer wideband RFID reader antenna; frequency 840 MHz to 960 MHz; impedance matching bandwidth; loss 14 dB; ultra-high frequency radio-frequency identification reader applications; universal UHF RFID band; wideband circularly-polarised antenna;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2012.1140

Filename

6204256