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Author: search.filters.author.Kosulvit, SompolSubject: search.filters.subject.RFID

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    Dual-band circular plate antenna with annular-ring slot and four-paired rectangular slots
    (2013-09-02)
    Boonying, Komkris
    ;
    Phongcharoenpanich, Chuwong
    ;
    Kosulvit, Sompol
    This paper presents dual-band circular plate antenna with an inserted annular-ring slot and four-paired rectangular slots excited by a feeding probe for RFID applications. The operating frequencies of the RFID system are 920 MHz to 925 MHz and 2.4 GHz to 2.5 GHz. It is found that at two bands, 922.5 MHz and 2.45 GHz, the S<inf>11</inf> are -14.7 dB and -23.2 dB, respectively. The radiation pattern of the proposed antenna radiates unidirectional beam with vertical polarization for both bands. The half-power beamwidths at 922.5 MHz in XZ-plane and XY-plane are 63.4 ° and 80.1 °, whereas ones at 2.45 GHz in XZ-plane and XY-plane are 35.5 ° and 57.6 °, respectively. The measured gain is higher than 5 dBi at both frequencies. © 2013 IEEE.
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    Meander-line antenna with arc structure for UHF-RFID Tag
    (2011-12-01)
    Wongsiritorn, Pitchanun
    ;
    Pumpoung, Tajchai
    ;
    Phongcharoenpanich, Chuwong
    ;
    Nuangwongsa, Kanawat
    ;
    Kosulvit, Sompol
    The new configuration of the RFID tag antenna is presented in this paper. It consists of meander-line with arc structure and T-matching technique to accomplish the very small tag antenna for an operation of the frequency band 920-925 MHz, corresponding to the standard of UHF RFID in Thailand. The electrical size of the proposed tag antenna is approximately 0.025λ <inf>0</inf> 0.24λ <inf>0</inf> or 0.8 mm × 79 mm, and it is designed by using NXP G2XL IC chip with the impedance of 21.29-j191.7 ω at the frequency of 922.5 MHz. The proposed tag antenna obtains the omnidirectional pattern with 0.91 dBi gain. It is fabricated on FR 4 with the thickness of 0.25 mm. The maximum read range is 8 m, which was measured by 4 W EIRP reader. © 2011 IEEE.