A Small and Lightweight Antenna for Handheld RFID Reader Applications

Author

Bang, Jae-Hoon ; Bat-Ochir, Chinzorig ; Koh, Hyung-Suk ; Cha, Eun-Jong ; Ahn, Bierng-Chearl

Author_Institution

Dept. of Radio & Commun. Eng., Chungbuk Nat. Univ., Cheongju, South Korea

Volume

11

fYear

2012

fDate

7/4/1905 12:00:00 AM

Firstpage

1076

Lastpage

1079

Abstract

This letter presents a circularly polarized antenna suitable for handheld radio frequency identification (RFID) reader applications. The proposed antenna consists of four meandered monopole elements fed by a series feed network, each segment having an equal magnitude and a successive 90^° phase difference. The monopole elements and the feed network are created on two separate printed circuit boards. Four coaxial lines are used to connect the feed network to the monopoles. Short-circuited tuning stubs are employed for impedance matching. A prototype antenna measuring 45 × 45 × 9 mm³ and weighing 13 g is designed, fabricated, and tested. Measurements show that the fabricated antenna has at 919 MHz a gain of 2.2 dBic, a 3-dB gain beamwidth of 150^°, and a 3-dB axial-ratio beamwidth of 146^°.

Keywords

UHF antennas; antenna feeds; coaxial cables; electromagnetic wave polarisation; impedance matching; monopole antennas; printed circuits; radiofrequency identification; antenna feed network; antenna measurement; axial-ratio beamwidth; circularly polarized antenna; coaxial line; frequency 919 MHz; gain 3 dB; handheld RFID reader application; impedance matching; mass 13 g; meandered monopole antenna element; printed circuit board; radio frequency identification; short-circuited tuning stub; Antenna measurements; Feeds; Gain; Radiofrequency identification; Substrates; Tuning; Circular polarization; lightweight antenna; radio frequency identification (RFID) reader; small antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2012.2217311

Filename

6296675