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    Dual-band RFID tag antenna with EBG for glass objects
    (2016-01-06)
    Phatarachaisakul, Teerapol
    ;
    Pumpoung, Tajchai
    ;
    Phongcharoenpanich, Chuwong
    The dual-band tag antenna designed for glass objects of HF-RFID (13.56 MHz) and UHF-RFID (920-925 MHz) applications along national standard of Thailand is proposed. The tag antenna has the same size with a credit card. The overall dimension of the tag antenna with EBG is 147 mm × 73.5 mm × 8.3 mm. The purpose of this antenna design is to implement with the RFID for the highway tracking and tolls systems. The tag antenna and EBG are designed on FR-4 substrate with thickness of 0.3 mm and 3 mm, respectively. To achieve the dual band operation, the designed tag antenna with EBG structure is based on the loop (spiral coil), the meander-line structure with double T-matching and mushroom-like EBG structure for HF-, UHF-RFID and EBG, respectively.
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    A four-beam pattern reconfigurable Yagi-Uda antenna
    (2013-01-01)
    Kittiyanpunya, C.
    ;
    Krairiksh, M.
    This communication presents a pattern reconfigurable antenna which is based on the Yagi-Uda configuration that can change the radiation beam into four directions. The function of the parasitic elements can be altered between a director and a reflector with PIN diodes while the driven element can be altered between two perpendicular directions with RF switches. To be able to use this proposed antenna on an electric conductor, such as on the vehicle rooftop, the antenna is thus mounted on electromagnetic band gap (EBG) structure which serves as a magnetic conductor. The gain is approximately 5 dBi and the field trial exhibited the diversity gain of 17 dB over the fixed beam antenna. As a result, the proposed antenna possesses high potential for further development into a TV signal reception on moving vehicles. © 2013 IEEE.