Parametric Study of a Circularly Polarized Planar Antenna for Reader of UHF RFID System

Author

Suwalak, Rattapong ; Phongcharoenpanich, Chuwong

Author_Institution

Res. Center for Commun. & Inf. Technol., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

Abstract

This paper presents the design of circularly polarized elliptical patch antenna (EPA) that radiates unidirectional beam. A circularly polarized patch antenna was investigated for the reader of the radio frequency identification (RFID) at ultra high frequency (UHF) band. The center frequency is 923 MHz with the bandwidth from 920 MHz to 925 MHz. The antenna structure is simple because we use the single feed for circular polarization. The prototype antenna was fabricated to measure the antenna characteristics. The pattern is unidirectional pattern with directivity of 8.93 dBi and axial ratio of 1.88 dB at the center frequency. The obtained bandwidth is 15 MHz.

Keywords

UHF antennas; antenna feeds; antenna radiation patterns; electromagnetic wave polarisation; planar antennas; radiofrequency identification; EPA; UHF RFID system; antenna directivity; antenna structure; axial ratio; circularly polarized elliptical planar antenna design; frequency 920 MHz to 925 MHz; radio frequency identification reader; single feed; ultra high frequency band; unidirectional beam pattern; Antenna feeds; Antenna measurements; Bandwidth; Frequency; Parametric study; Patch antennas; Planar arrays; Polarization; Prototypes; Radiofrequency identification; RFID antenna; UHF; circular polarization; planar antenna;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. APMC 2007. Asia-Pacific

Conference_Location

Bangkok

Print_ISBN

978-1-4244-0748-4

Electronic_ISBN

978-1-4244-0749-1

Type

conf

DOI

10.1109/APMC.2007.4555059

Filename

4555059