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    Electromagnetic Design Considerations of Wideband Radome for Antenna Array of Digital Television Broadcasting Transmission
    (2018-07-02)
    Dentri, Sitthichai
    ;
    Osklang, Pracha
    ;
    Luadang, Bancha
    ;
    Phongcharoenpanich, Chuwong
    The electromagnetic properties are considered for the radome design of the wideband application in digital television (DTV) antenna array used for broadcasting transmission. The manufactured material with associated geometry is appropriately chosen to achieve the optimum radiation performances. The radome design guidelines for the wideband DTV antenna array of the broadcasting transmission are provided. The presented information is significant for DTV antenna array of future development.
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    A triple band antenna using dipole and interdigital structures
    (2018-06-01)
    Archevapanich, Tuanjai
    ;
    Chomtong, Pongsathorn
    ;
    Chutchavong, Vanvisa
    ;
    Akkaraekthalin, Prayoot
    This paper proposes a triple band antenna using interdigital technique based on a planar dipole structure. The antenna has been designed at the fundamental frequency of 1.8 GHz. With this proposed technique, the harmonic frequency bands of 2.45 and 5.2 can be created. The designed antenna can support various applications including indoor LTE, WLAN and wireless sensor base station systems. The simulation results of the antenna show superior characteristics in form of return loss and radiation pattern.
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    A simple and cost-effective bidirectional antenna using a probe excited circular ring
    (2001-01-01)
    Kosulvit, Sompol
    ;
    Krairiksh, Monai
    ;
    Phongcharoenpanich, Chuwong
    ;
    Wakabayashi, Toshio
    This paper presents a simple and cost-effective bidirectional antenna using a probe excited circular ring. The structure of the antenna is simple i.e., a linear electric probe surrounded by the circular ring. The principle of the antenna design is easy and straightforward. A choice of the ring radius is first chosen to achieve the condition that only the dominant mode can be propagated. Furthermore, it is found that for a specific ring radius, the radiation patterns of the antenna are varied as the ring width. Then, the optimum ring width that provides the maximum directivity is determined. The criterion of the selection of the ring width for various ring radii is illustrated as the guidelines for the antenna design. The fabricated antennas at the operating frequency of 1.9065 GHz are measured and compared with the theoretical predictions. It is apparent that these results are in reasonable agreement. The bidirectional pattern with the gain of 5.4 dBi over the bandwidth of 17% is obtained. Moreover, the antenna can be easily fabricated with the low production cost. Therefore, this antenna is suitable for installing at the base station in the street cell.