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Novel UHF RFID Tag Antenna for Metallic Foil Packages
Jeongki Ryoo,Jaeyul Choo,Hosung Choo IEEE 2012 IEEE transactions on antennas and propagation Vol.60 No.1
<P>A low-cost wideband antenna for radio-frequency identification (RFID) tags for use with metallic foil packages is designed in this communication. An proximity inductively coupled feed structure is employed to perform wideband impedance matching between a slot on a metallic foil package and a small rectangular feeding loop connected to a microchip. The results show a measured half-power bandwidth of 32.2% (799 MHz-1,093 MHz) and a reading distance of over 10 m.</P>
Jaeyul Choo,Jeongki Ryoo,Hosung Choo 한국전자파학회JEES 2011 Journal of Electromagnetic Engineering and Science Vol.11 No.1
In this letter, we propose a novel tag antenna that has low performance degradation with nearby dielectric material. We obtained a stable reading performance and a broad matching bandwidth on nearby dielectric materials by employing a T-matching network with thick line width and capacitively slot-loaded arms. We then built the proposed antenna and measured the tag sensitivity to examine the reading characteristics with nearby dielectric materials. The measured results clearly demonstrate stable tag sensitivity with various nearby dielectric materials, such as foam, acrylic-plastic, glass, and ceramic plates. To more closely observe the antenna characteristics with nearby dielectric materials, we also examined the impedance variation and surface current distribution with respect to the dielectric constant of nearby target objects, which ranged from 1×ε? to 16×ε?.
Planar Near-Field RFID Reader Antenna for Item-Level Tagging
Chihyun Cho,Chuyong Lee,Jeongki Ryoo,Hosung Choo IEEE 2011 IEEE antennas and wireless propagation letters Vol.10 No.-
<P>In this letter, we propose a novel UHF planar near-field antenna for the application of RFID item-level tagging. The proposed antenna was designed to have a strong and uniform H<SUB>z</SUB>-field over a broad antenna aperture to identify the various items with stable reading performance. To obtain a strong near H<SUB>z</SUB>-field, two coupled patches are employed along with a microstrip-line feed, resulting in average H<SUB>z</SUB> of -15 dBA/m on antenna aperture (30 × 30 × 10 cm<SUP>3</SUP>). We also measured the reading range, and it confirmed that the proposed antenna is suitable for a commercial RFID smart-shelf application.</P>
Performance Analysis of Single Channel Interferometer using circular array antenna in FH environment
JongMook Won,CheolSoo Lee,JeungMin Joo,JunHo Song,YoungJin Ryoo,KwangIl Lee,JeongKi Pack 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we perform the one channel Interferometer technique using circular array antenna in practical Frequency Hopping environment. For the one channel Interferometer technique, switching process and phase estimation algorithm and Correlation Vector Direction Finding (CVDF) is used. And we simulate the Direction Finding (DF) Accuracy by the error of switching and phase estimation in case Frequency Hopping signal exist. Also, the simulations include the DF error by the modulation of the interested narrow band signal.