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    Design of flat spiral rectangular loop gate antenna for HF-RFID systems
    (2008-12-01)
    Kawdungta, Supakit
    ;
    Phongcharoenpanich, Chuwong
    ;
    Torrungrueng, Danai
    This paper presents a flat spiral rectangular loop gate antenna in walk-through gate installation for improving the distribution of magnetic field in High-Frequency Radio Frequency Identification (HF-RFID) systems. The spiral structure can provide the magnetic field distribution to cover desired region in various directions. This antenna is designed as a walk-through gate for the anti-theft application. The prototype antenna was fabricated and measured to confirm the antenna performance. ©2008 IEEE.
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    The effect of varying dimension of slot loop antenna
    (2005-12-01)
    Chanoodhorm, S.
    ;
    Anantrasirichai, N.
    ;
    Wakabayashi, T.
    The purpose of this paper is to study the effect of varying dimension of slot loop antenna by fix perimeter. The concept of designing is most simply introduced by considering a width of slot antenna for match impedance 50 ohms. This research is concerned in proportional of length and width of loop shape, such as : square loop shape 1:1, rectangular loop shape 5:4, 10:7, 3:2 and 2:1, respectively. The perimeter of loop shape is designed at frequency 2.4 GHz, this perimeter is fixed for other loop shape for considered the effect of varying dimension. © 2005 IEEE.