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Author: search.filters.author.Krairiksh, MonaiSubject: search.filters.subject.Dual-band

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    An annular microstrip antenna with sectoral slots for RFID reader
    (2009-12-01)
    Suwalak, Rattapong
    ;
    Pongpaibool, Pornanong
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    This paper presents an annular microstrip antenna with two sectoral slots fed by a coaxial probe on a square vertical ground plane. The proposed microstrip antenna can support the dual-band operation (UHF and microwave RFID bands). From the results, the antenna has the magnitude of S11 less than -10 dB along the bandwidth of 32 MHz (3.51%) for UHF band and 140 MHz (5.76%) for microwave band. The unidirectional beam can be achieved by the proposed microstrip antenna. The beamwidth in xz- and yz-planes is 82.8 and 89 degrees at the center frequency of 922.5 MHz and beamwidth in xz- and yz-planes is 39.8 and 28 degrees at the center frequency of 2.45 GHz, respectively. This antenna has efficiently high directivity for both bands. The simulation and measurement results are shown. ©2009 IEEE.