Planar near-field RFID reader antenna using opposite-directed currents

Author

Lee, Chuyong ; Cho, Chihyun ; Ryoo, Jeongki ; Park, Ikmo ; Choo, Hosung

Author_Institution

Sch. of Electron. & Electr. Eng., Hongik Univ., Seoul

fYear

2009

fDate

2-4 March 2009

Firstpage

1

Lastpage

4

Abstract

In this paper we propose a novel planar near-field antenna for radio-frequency identification (RFID) based on the principle that two closely spaced opposite-directed currents (ODC) can generate a strong magnetic field over a broad surface area. To implement the ODC concept, the proposed antenna uses a dipole and a parasitic patch with a microstrip feedline. The proposed antenna provides an Hz field greater than -20 dBA/m in a region of 30 times 30 cm². Measurements with a commercial RFID system show a maximum reading range of 24 cm, and a reading area of 744 cm² for a reading range greater than 5 cm.

Keywords

magnetic fields; microstrip lines; planar antennas; radiofrequency identification; RFID reader antenna; dipole antenna; magnetic field; microstrip feedline; opposite-directed currents; planar near-field antenna; radio-frequency identification; Antenna accessories; Antenna measurements; Aperture antennas; Area measurement; Dipole antennas; Magnetic field measurement; Magnetic fields; Microstrip antennas; Radio frequency; Radiofrequency identification;

fLanguage

English

Publisher

ieee

Conference_Titel

Antenna Technology, 2009. iWAT 2009. IEEE International Workshop on

Conference_Location

Santa Monica, CA

Print_ISBN

978-1-4244-4395-6

Electronic_ISBN

978-1-4244-4396-3

Type

conf

DOI

10.1109/IWAT.2009.4906920

Filename

4906920