A circularly polarized square plate antenna with two inclined slots for UHF-RFID reader

Author

Charoenchue, Putuch ; Phongcharoenpanich, Chuwong ; Phaebua, Kittisak ; Aunchaleevarapan, Kraison

Author_Institution

Fac. of Eng., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok, Thailand

fYear

2011

fDate

7-9 Dec. 2011

Firstpage

1

Lastpage

4

Abstract

This paper presents a circularly polarized square plate antenna with two inclined slots excited by a probe on square ground plane to radiate circularly polarized unidirectional beam. This antenna is proposed for installing at the reader of Radio Frequency Identification (RFID) at Ultra High Frequency (UHF) band. UHF-RFID in Thailand has the bandwidth from 920 MHz to 925 MHz, and center frequency is 922.5 MHz. The proposed antenna structure is simple because of using the single probe to feed the antenna for circularly polarized radiation. The pattern of this antenna is unidirectional beam with gain 8.6 dBic and axial ratio of 0.92 dB at center frequency. The obtained measured bandwidth is 50 MHz.

Keywords

UHF antennas; antenna feeds; antenna radiation patterns; electromagnetic wave polarisation; radiofrequency identification; Thailand; UHF-RFID reader; antenna feed; circularly-polarized square-plate antenna; circularly-polarized unidirectional beam radiation; inclined slot; radiofrequency identification; ultrahigh-frequency band; unidirectional beam pattern; Programmable logic arrays; Circularly Polarized; RFID; UHF;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Signal Processing and Communications Systems (ISPACS), 2011 International Symposium on

Conference_Location

Chiang Mai

Print_ISBN

978-1-4577-2165-6

Type

conf

DOI

10.1109/ISPACS.2011.6146137

Filename

6146137