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A Study on the Magnetic Field Improvement for 13.56MHz RFID Reader Antenna  

Kim, Hyuck-Jin (Dept. of Electronics Engineering, University of Incheon)
Yang, Woon-Geun (Dept. of Electronics Engineering, University of Incheon)
Yoo, Hong-Jun (JT Corporation)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.1, 2006 , pp. 1-8 More about this Journal
Abstract
In this paper, we suggested a new antenna structure for the RFID(Radio Frequency IDentification) reader. The conventional RFID reader uses a loop antenna. The central area of a loop antenna shows a low magnetic field strength, especially for the case of a large loop antenna diameter. We proposed a parallel-fed multiple loop antenna. Simulation and measurement were carried out for a single loop antenna, series-fed and parallel-fed multiple loop antennas. Simulation results show that we can obtain 0.40A/m, 0.68A/m, 1.98A/m of magnetic field strengths at the central point of a reader antenna for a single loop antenna, series-fed and parallel-fed multiple loop antennas, respectively. We measured the $79mm{\time}48mm$ tag area averaged induced voltages with applying 20Vp-p same source signals to reader antennas through the resistors. Measured tag area averaged induced voltages at the central point of a reader antennas were 0.76V, 1.45V, 4.04V for a single loop antenna series-fed and parallel-fed multiple loop antennas, respectively. The results show that we can get high induced voltage which can grantee a longer reading distance with a proposed parallel-fed multiple loop antenna.
Keywords
RFID reader; parallel-fed; multiple loop antenna; magnetic field strength;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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