Slits Loaded Circularly Polarized Universal UHF RFID Reader Antenna

Author

Sim, Chow-Yen-Desmond ; Yi-Wen Hsu ; Guanli Yang

Author_Institution

Dept. of Electr. Eng., Feng Chia Univ., Taichung, Taiwan

Volume

14

fYear

2015

fDate

2015

Firstpage

827

Lastpage

830

Abstract

A simple structure circularly polarized (CP) UHF (ultrahigh frequency) RFID (radio frequency identification) reader antenna that operates within the universal RFID bands (840-960 MHz) is investigated. Here, the technique of loading a corner truncated square patch antenna into an L-shaped ground plane is initially studied to achieve good impedance matching with broad CP bandwidth. To further enhance both the impedance bandwidth and CP bandwidth, a novel technique of loading three narrow slits into the corner truncated square patch is proposed. By meticulously arranging these three slits in a certain manner, from the experimental results, besides achieving a gain level of approximately 8.6 dBic, the proposed antenna can also yield an impedance bandwidth from 685 to 1125 MHz, while good CP bandwidth between 836 and 986 MHz is also demonstrated.

Keywords

UHF antennas; electromagnetic wave polarisation; impedance matching; microstrip antennas; radiofrequency identification; CP bandwidth enhancement; L-shaped ground plane; bandwidth 685 MHz to 1125 MHz; circular polarization; corner truncated square patch antenna; frequency 840 MHz to 960 MHz; gain level; impedance bandwidth enhancement; impedance matching; slits loaded CP UHF RFID reader antenna; ultrahigh frequency radio frequency identification reader antenna; Antenna measurements; Bandwidth; Frequency measurement; Gain; Patch antennas; Radiofrequency identification; Axial ratio; RFID antenna; circular polarization; corner truncated square patch; slit loaded; universal UHF band;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2014.2382557

Filename

6990503