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Access type: UnknownAuthor: search.filters.author.Ngamjanyaporn, P.

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    A switch-beam circular array antenna using pattern reconfigurable Yagi-Uda antenna for space communications
    (2017-12-19)
    Ngamjanyaporn, P.
    ;
    Kittiyanpunya, C.
    ;
    Krairiksh, M.
    This paper presents a switch-beam circular array antenna using pattern reconfigurable Yagi-Uda antenna. A two-beam switching Yagi-Uda antenna is applied as an array element. The 3-element circular array is introduced to be able to switch the main beam in azimuth direction by switching the beam and shifting the excitation phase of array elements. The array antenna is designed at 2.4 GHz for drone or UAV radio controlling. The two-beam elements and 90°-shifted phase of excitation are applied to realize the proposed switched-beam array antenna. The simulated results show that the array antenna can provide 7 main beam directions covering a half azimuth plane (0° ≤ φ ≤ 180°) and gain of the array antenna is higher than 7 dBi.
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    Spherical array self-mixing oscillator antenna
    (2002-06-20)
    Krairiksh, M.
    ;
    Buasomboon, W.
    ;
    Ngamjanyaporn, P.
    ;
    Phongcharoenpanich, C.
    A spherical array self-mixing oscillator antenna is designed by applying the injection locking technique to the spherical array of Gunn diode mounted waveguide radiators. The beam steering with considerably constant pattern and low cross-polarisation can be accomplished without using the sophisticated phase shifters. This antenna is designed and tested at the frequency of 10 GHz.
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    Switched-beam single patch antenna
    (2002-01-03)
    Ngamjanyaporn, P.
    ;
    Krairiksh, M.
    A simple and compact switched-beam antenna is presented. The radiation patterns of the antenna were predicted using the finite difference time domain method. Measurement was performed, and the results show good agreement with predictions. Low correlation can be expected from this antenna for diversity reception.
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    Analysis of circular array of monopole on the ground plane radiating linearly polarized conical beam for wireless LAN applications
    (2000-01-01)
    Phongcharoenpanich, C.
    ;
    Suriya, S.
    ;
    Lertwiriyaprapa, T.
    ;
    Ngamjanyaporn, P.
    ;
    Krairiksh, M.
    An analysis of a conical beam antenna using circular array of monopole on the ground plane is presented. This antenna was proposed for application to the HIPERLAN system. The structure of this antenna type is simple and easy to fabricate. The radiation pattern of the antenna is calculated by combining the total fields radiated from each monopole on the ground plane. The effect of the finite size ground plane is taken into account and found that it affects the back lobe level. Moreover, it is apparent that a nondirectional azimuthal pattern is realized when the circumferential spacing is sufficiently small. The radiation patterns for various parameters such as the array radius and the number of elements are demonstrated. Antenna measurements are set up to verify the proposed principle. The theoretical and experimental results are in good agreement.