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Subject: search.filters.subject.dielectric material

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    Comparative Testing of Breakdown Voltage Versus Polarization Current of 0.6/1kV XLPE Cables with Different Defects
    (2018-07-02)
    Singhasivanon, Jakawan
    ;
    Jirasuwankul, Nirudh
    ;
    Pattanadech, Norasage
    In this paper, a study of breakdown voltage versus polarization current was performed comparatively to explore whether there was an existing of relationship between the two phenomena. The experiment was performed on low voltage \pmb{(0.6/1\mathrm{kV})} XLPE cables with three different cases of defect, case 1: conductor cladded with small and thin copper strip, case 2: conductor cladded with thin plastic ring, and case3: conductor cladded with plane paper strip. The results illustrated that breakdown voltage tends adversely to polarization current in all test cases. When the polarization current was increasing, the breakdown voltage was decreasing. Whereas the polarization current was decreasing, the breakdown voltage was increasing. It was also found that defective cable with thin copper strip has the lowest breakdown voltage whereas one with plane paper strip has the highest breakdown voltage.
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    Chipped and chipless RFID sensors for quality monitoring of light weight concrete using the radar equation
    (2016-09-06)
    Suwalak, Rattapong
    ;
    Phongcharoenpanich, Chuwong
    ;
    Torrungrueng, Danai
    Chipped and chipless RFID (Radio frequency identification) sensors for quality monitoring of light weight concrete (LWC) using the radar equation are presented. In this paper, a printed loop tag with a meander-line is employed as a chipped RFID sensor and a dual printed perpendicular square loop tag is employed as a chipless RFID sensor. The optimum parameters of the proposed RFID sensors are obtained using the CST Microwave Studio program. Both RFID sensors with/without IC chip are used to improve the accuracy of dielectric material determination. In addition, the relation between the read range (R<inf>max</inf>) and the real part of dielectric constant (<inf>r</inf>) is studied. It is found that it can be used to determine the dielectric constant of LWC.
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    Dielectric material determination using the radar equation in RFID sensor applications
    (2016-03-07)
    Suwalak, Rattapong
    ;
    Phongcharoenpanich, Chuwong
    ;
    Torrungrueng, Danai
    ;
    Akkaraekthalin, Prayoot
    A radar-cross section (RCS) of passive printed tags in a radio frequency identification (RFID) is presented to determine a dielectric constant of a material under test (MUT). In this paper, a printed loop tag with a meander-line is employed as an RFID sensor. The optimum parameters of the proposed RFID sensor are obtained using the CST Microwave Studio program. This paper employs two RFID sensors with different RCS to improve the accuracy of dielectric material determination. The relation between the read range (Rmax) and the real part of dielectric constant (?r) can be used to determine the dielectric constant of MUT.
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    A radar-cross section of a passive tag on dielectric material in an RFID sensor application
    (2015-08-17)
    Suwalak, Rattapong
    ;
    Phongcharoenpanich, Chuwong
    ;
    Torrungrueng, Danai
    ;
    Akkaraekthalin, Prayoot
    This paper is mainly present to a radar-cross section (RCS) of a passive tag in a radio frequency identification (RFID) sensor application. To determine qualities of a dielectric material under test (MUT) with a non-destructive testing (NDT) technique, a proposed meander-line dipole tag antenna is employed as a RFID sensor. The design and optimum parameters of the proposed RFID sensor are obtained using the CST Microwave Studio program. In this paper, instead of focusing on the scalar backscattered power based on the Friis transmission equation, we are also studying the RCS range equation to utilize for improve the accuracy of determination a qualities of MUT in a RFID sensor system. Simulated results show that the characteristics of the proposed RFID sensor such as the input impedance, antenna gain, power transmission coefficient and RCS.