Log-periodic dipole array with improved front-to-back ratio for universal UHF RFID handheld reader applications

Author

Huang, Ting-Jui ; Hsu, Heng-Tung

Author_Institution

Dept. of Commun. Eng., Yuan Ze Univ., Chungli, Taiwan

fYear

2012

fDate

8-14 July 2012

Firstpage

1

Lastpage

2

Abstract

This paper presents an antenna design for universal UHF RFID handheld readers. Four-element log-periodic dipole array was adopted as the basic antenna structure. The arms of the radiators were folded to make the antenna compact in size. Parasitic elements were also included to improve the front-to-back ratio. The fabricated prototype exhibited good impedance bandwidth covering the universal UHF RFID band from 840MHz to 960MHz. Besides, the overall radiation efficiency was above 80% across the entire band. A maximum of 10dB improvement in front-to-back ratio was achieved at 920MHz.

Keywords

UHF antennas; dipole antenna arrays; radiofrequency identification; radiowave propagation; antenna compact; antenna design; antenna structure; four-element log-periodic dipole array; frequency 920 MHz; front-to-back ratio; log-periodic dipole array; parasitic elements; prototype fabrication; radiation efficiency; universal UHF RFID band; universal UHF RFID handheld reader applications; Antenna measurements; Dipole antennas; Radiofrequency identification; UHF antennas; UHF measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2012 IEEE

Conference_Location

Chicago, IL

ISSN

1522-3965

Print_ISBN

978-1-4673-0461-0

Type

conf

DOI

10.1109/APS.2012.6349198

Filename

6349198