Compact square quadrifilar spiral antenna with circular polarization for UHF mobile RFID reader

Author

Son, Wang-Ik ; Lee, Han-Lim ; Lee, Moon-Que ; Min, Sang-Bo ; Yu, Jong-Won

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea

fYear

2010

fDate

7-10 Dec. 2010

Firstpage

2271

Lastpage

2274

Abstract

A compact square quadrifilar spiral antenna (QSA) with right-hand circular polarization for mobile UHF passive radio frequency identification (RFID) reader is presented. The proposed QSA consists of four spiral antennas fed by microstrip feed network. The proposed reader antenna matching is optimized by using the matching condition for a small 4-port antenna. Experimental results show that the QSA of size 60 × 60 × 17 mm³ has a 3-dB beamwidth of more than 130, the front-to-back ratio of more than 15 dB, the peak gain of 2.5 dBic and the axial ratio under 2 dB.

Keywords

UHF devices; microstrip antennas; polarisation; radiofrequency identification; spiral antennas; circular polarization; compact square quadrifilar spiral antenna; gain 2.5 dB; microstrip feed network; mobile UHF passive radio frequency identification reader; reader antenna matching; small 4-port antenna; Dipole antennas; Frequency measurement; Gain; Radiofrequency identification; Spirals; UHF antennas; Quadrifilar spiral antenna; UHF mobile RFID reader antenna; circular polarization;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference Proceedings (APMC), 2010 Asia-Pacific

Conference_Location

Yokohama

Print_ISBN

978-1-4244-7590-2

Electronic_ISBN

978-1-902339-22-2

Type

conf

Filename

5728313