Suwalak, Rattapong
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Preferred name
Suwalak, Rattapong
Alternative Name
Suwalak, R.
Main Affiliation
Email
rattapong.su@kmitl.ac.th
16 results
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Item type:Publication, Non-destructive determination of coconut oil using microwave dielectric constant sensing(2019-01-01); Coconut oil demand for food, medical and cosmetic uses is increasing. Analyses of quality using non-destructive tools would be useful, and therefore, wireless sensing using high frequency to determine the percentage of coconut oil has been tested. The proposed sensing is based on the wireless power transmission and the penetration of the ultrahigh frequency wave. The system operates with the microwave transceiver that generates wireless power and receives the backscatter power from a sensor placed on a coconut. A transceiver at microwave frequency of 920-925 MHz with low power level was used to avoid affecting coconut quality. Wireless microwave dielectric constant sensing was used with reasonable accuracy to determine the percentage of the coconut oil. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Characteristics of specifically designed tags placed on a dielectric material(2014-01-01); ; Torrungrueng, DanaiA proposed folded dipole tag antenna for a radio frequency identification (RFID) sensor system is employed to determine qualities of a material under test (MUT). In this paper, a study on the characteristics of specifically designed tags (SDTs) placed on a dielectric material with a gap is presented. The CST Microwave Studio is used to study characteristics of these SDTs in the presence of an MUT near or contact with SDTs. Simulated results show that different SDTs provide different characteristics depending on MUTs. © 2014 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A radar-cross section of a passive tag on dielectric material in an RFID sensor application(2015-08-17); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Curved meander line resonators for chipless RFID sensors(2019-09-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A compact loop antenna with parasitic split ring for UHF RFID application(2013-05-27); This paper presents a compact loop antenna with parasitic split ring for the reader of the UHF RFID application. The proposed antenna is made up of the rectangular loop structure (feeding element) and the parasitic split ring to reduce the overall antenna dimension. It is found that the size can be decreased by 50% of the typical single loop antenna. The simulation is carried out by using CST Microwave Studio program based on the Finite Integral Technique (FIT). Furthermore, the antenna parameters are optimized using the Quasi Newton method. The effect of the antenna parameters on the impedance bandwidth are investigated in this paper. The comparison between the simulation and experimental results are also discussed. From the results, the antenna has the S<inf>11</inf> less than -10 dB along the bandwidth of 12MHz (1.6%). It can be operated in UHF RFID system in Thailand with the frequency band from 920MHz to 925 MHz. The omnidirectional beam is obtained with the maximum gain of 1.5 dBi at the center frequency of 922.5 MHz. The antenna is designed on FR4-substrate. The overall size of the proposed antenna is 51mm x 38mm x 0.8mm (0.15λx 0.11λx 0.02̧). It is easily embedded inside handheld reader. Moreover, the proposed antenna is simple structure, low profile and easy fabrication. Therefore, the compact loop antenna with parasitic split ring can be employed with a handheld UHF RFID reader. Copyright © 2013 The Electromagnetics Academy. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Characteristics of an RFID sensor for a different number of reinforced metal bars in lossy light weight concrete(2015-04-22); ; Torrungrueng, DanaiThe radio frequency identification (RFID) sensor technique applied to detect a different number of reinforced metal bars in a lossy light weight concrete (LWC) is presented. The proposed dipole antenna with inductive loop is employed as an RFID sensor. A different number of reinforced metal bars are studied through the characteristics of the RFID sensor placed on LWC. Simulations are performed using the CST Microwave Studio simulation program. It is found that the reinforced metal bars in LWC have important effects to the antenna gain of the RFID sensor. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Determination of dielectric property of construction material products using a novel RFID sensor(2012-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Dual-band RFID-reader antenna using annular plate with curved and rectangular slots(2010-12-01); A dual-band antenna for the reader of the Radio Frequency Identification (RFID) applications is proposed. The antenna design to achieve the dual-frequency band is carried out by using the annular plate with curved and rectangular slots. The simulation is done by using CST based on the Finite Integral Method. Furthermore, the parameters of antenna are optimized with the Quasi Newton method. The effects of antenna parameters are analyzed. Along the UHF-RFID band, the pattern is unidirectional beam. The half-power beamwidths in xz- and yz- planes are 78 and 64 degrees, respectively. The bandwidth covers 911-925.6 MHz. The directivity is 8.33 dBi. For 2.45 GHz band, the pattern is also unidirectional beam. The half-power beamwidths in xz- and yz-planes are 58 and 21 degrees, respectively. The bandwidth covers 2.32-2.52 GHz. The gain is 9-10.5 dBi. ©2010 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effects of tag location on light weight concrete for an RFID sensor application(2012-10-02); ; ; Torrungrueng, DanaiThe radio frequency identification (RFID) tags are proposed to be employed as remotely read dielectric-property sensors to determine qualities of some construction material products (CMPs); e.g., light weight concrete (LWC), mortar specimens and concrete. This paper presents a study of the characteristics of an RFID tag mounted at several locations on the LWC. The numerical simulations are performed using the CST Microwave Studio to study effects of tag, where the folded dipole with an inductive loop tag antenna is used. Results show that locations of an RFID tag on LWC affects the tag antenna characteristics such as input impedance, gain and radiation pattern. © 2012 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Recent Advances in RFID Sensors for Construction Material Monitoring Applications (Invited Paper)(2018-07-02); ;