Title :
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
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;
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
DOI :
10.1109/IWAT.2009.4906920
