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Author: search.filters.author.Yoiyod, P.Subject: search.filters.subject.Reflectometer

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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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    Microwave vector reflectometer using self-mixing oscillator antennas
    (2015-01-01)
    Yoiyod, P.
    ;
    Krairiksh, M.
    This paper presents a microwave reflectometer using self-mixing oscillator antennas. A unique characteristic of the proposed reflectometer is its simple structure without a circulator and a directional coupler. Each self-mixing oscillator antenna utilizes a Gunn diode as an active device and a rectangular waveguide as a resonator and a radiator. The determination of dielectric properties of materials was carried out at 9.79 GHz and the measured results using the proposed reflectometer were in good agreement with those by a dielectric probe. In addition, the reflectometer has several industrial applications, e.g. fruit classification, moisture content sensing, etc.