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Author: search.filters.author.Pansomboon, RassamitutSubject: search.filters.subject.UHF RFID

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    Item type:Publication,
    The multiple loop antenna for enhanced readability performances of near-field UHF RFID applications
    (2016-06-01)
    Pansomboon, Rassamitut
    ;
    Phongcharoenpanich, Chuwong
    This research is concerned with a multiple loop antenna applicable to near field ultra-high frequency (UHF) radio frequency identification (RFID). The proposed multi-loop antenna is configured to induce the robust and even magnetic field distributions in the H<inf>x</inf>, H<inf>y</inf>, and H<inf>z</inf> orientations so as to achieve the enhanced readability performances in all directions (i.e., x, y, and z). Simulations were carried out using CST Microwave Studio to determine the impedance bandwidth (|S<inf>11</inf>|<−10 dB) in the frequency range of 920–925 MHz (i.e., Thailand's UHF RFID standard) and to investigate the H<inf>x</inf>-, H<inf>y</inf>-, and H<inf>z</inf>-oriented magnetic field distributions. A prototype antenna of 14 cm × 16 cm × 0.6 mm (W × L × H) in overall dimension was subsequently fabricated on an FR4 substrate connected to a coaxial cable. In this research, the H<inf>x</inf>-, H<inf>y</inf>-, and H<inf>z</inf>-oriented magnetic field distributions of the prototype antenna were measured in the x-axis, y-axis, and x–y plane and are in good agreement with the simulation results. The measured readability performances in the x-, y-, and z-directions in which seven near field UHF RFID tags were deployed unobstructed (i.e., in open air) are respectively 25.27%, 31.73%, and 85.43%. Furthermore, the performances on the antenna readability with the tags attached to the microcentrifuge tubes are 30.55%, 25.90%, and 69.09% for the x-, y-, and z-directions. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:402–417, 2016.
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    Improvement of multiple loop antenna for near-field UHF RFID applications
    (2014-11-20)
    Pansomboon, Rassamitut
    ;
    Phongcharoenpanich, Chuwong
    ;
    Kawdungta, Supakit
    In this paper, the design of multiple loop antenna is presented for near-field UHF radio frequency identification (RFID) applications. The proposed antenna is operated at 920-925 MHz along the standard of the RFID frequency band in Thailand. The antenna can generate the magnetic field distribution in three principal directions in the operating area. The prototype antenna was fabricated on FR4 substrate with overall size of 13.90 cm × 16.10 cm × 0.6 mm. The proposed antenna has a good impedance matching and uniform magnetic field distribution.