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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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    Detecting granulated fruit by measuring dual-frequency back scattered waves
    (2017-07-02)
    Kittiyanpunya, C.
    ;
    Phongcharoenpanich, C.
    ;
    Krairiksh, M.
    Granulation is a kind of defection in fruits that must be non-destructively detected. Electromagnetic wave measurement is a feasible technique for in-situ measurement. With thick peel, it is necessary to eliminate the effect of peel so that sole effect of variation of pulp can be detected. This paper presents the simulated scattering coefficient from fruit with dual-frequency that exhibits more obvious results than the single-frequency measurement. The results lead to the appropriate design of a sensor for granulation detection.
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    A reflectometer using antenna mixers
    (2016-03-07)
    Inrun, R.
    ;
    Vichianchai, R.
    ;
    Leekul, P.
    ;
    Kittiyanpunya, C.
    ;
    Krairiksh, M.
    This paper presents a sensor for monitoring moisture content of paper. The reflection coefficient of paper at various moisture contents are measured and used for determining humidity of paper. The resultant IF output of 50 MHz from the reflectometer operating at the frequency of 2.40 GHz and 2.45 GHz shows an obvious difference in reflection coefficient for dry and wet paper depicting the feasibility to design a moisture content sensor.
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    Pattern and frequency reconfigurable meander line Yagi-Uda antenna
    (2016-01-20)
    Utayo, M.
    ;
    Sangthongngam, W.
    ;
    Kittiyanpunya, C.
    ;
    Krairiksh, M.
    This paper presents a pattern and frequency reconfigurable meander line Yagi-Uda antenna for digital terrestrial television reception. To achieve a compact size for installing on a vehicle, the antenna is designed with meander line. The main beam switching and resonant frequency tuning are accomplished by loading two driven elements and four parasitic elements with the short or open of RF switches. The frequency is reconfigured with different electrical length of the driven element. The direction of the beam is shifted by alternating the short or open status of RF switches in parasitic elements.
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    Dual beam Yagi patch antenna
    (2015-10-22)
    Samree, S.
    ;
    Getjulom, S.
    ;
    Teangrod, S.
    ;
    Kittiyanpunya, C.
    ;
    Krairiksh, M.
    This paper presents a dual beam Yagi patch antenna. The antenna operates in the ISM band of 2.41 and 2.45 GHz. It consists of rectangular patch fed at two different probe positions. The patch has two reflectors each provides directional pattern in two perpendicular directions. The isolation is better than 20 dB and directivity is more than 3 dBi. This antenna can be applied for receiving video signals from wireless cameras.
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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.