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    Item type:Publication,
    Dihedral corner reflector antenna excited by a probe inside rectangular ring
    (2003-01-01)
    Lamultree, S.
    ;
    Phongcharoenpanich, C.
    ;
    Kosulvit, S.
    ;
    Krairiksh, M.
    This paper proposes a dihedral corner reflector excited by a probe inside rectangular ring. The antenna structure is simple. The radiation characteristics of the antenna for various spacing between a probe inside rectangular ring and the dihedral corner reflector are analyzed. The numerical results of the radiation pattern, elevational and azimuthal beam peak in E-plane and H-plane, beamwidth and maximum directivity are substantially investigated. In addition, these characteristics are also compared among the included angles of 30°, 45°, 60° and 90° of dihedral corner reflector. The result of the analysis is very useful to design the antenna of high directivity with unidirectional beam.
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    The result analysis of economic distribution transformer design in Thailand
    (2002-12-01)
    Suechoey, Boonlert
    ;
    Bunjongjit, Sulee
    ;
    Kando, M.
    Thailand's medium-sized industries, with demands rating from 30 - 999 kW., currently need to develop distribution transformers that provide the highest efficiency regarding the transformer low losses and lowest costs. This is partly because the energy authorities that provide the electricity have fixed the transformer losses. In this paper, the result analysis of transformer design is presented. The considered factor include efficiency, losses throughout the transformer costs. The analysis includes an example of calculation and selection.