Suwalak, Rattapong
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Preferred name
Suwalak, Rattapong
Alternative Name
Suwalak, R.
Main Affiliation
Email
rattapong.su@kmitl.ac.th
28 results
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Item type:Publication, Path loss model and measurements of 5.8 ghz wireless network in durian garden(2008-12-01); ; This paper presents the path loss model and measurement of wireless network in durian garden at 5.8 GHz. This study is important in wireless communication system for predication and design the communication system of durian garden such as communication range, power transfer, position of transmitting and receiving antenna. From the results, it is obvious that the path loss at the distance of 128 m from the transmitter is less than -50 dB. © 2008 IEEE. - Some of the metrics are blocked by yourconsent settings
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, Dual-Band Band-Stop Filter for Chipless RFID Sensor in a Dielectric Constant Determination(2022-01-01); ; Torrungrueng, DanaiThis paper presents the dual-band band-stop filter to operate with the chipless RFID tag acts as the RFID sensor for a dielectric constant determination and the identification characteristic based on the signature responded signal from the chipless RFID sensor system. The proposed dual-band filter can generate the dual-stop band of the frequency of 2.2 GHz and 2.7 GHz. The 3-bits identification (ID) i.e., ID-01, ID-10, and ID-11 are obtained from the proposed filter. In addition, the chipless RFID sensor with band-stop filter technique can be determined the dielectric constant of RT/Duroid5880, Fr4 (Glass Epoxy), and low-Temperature cofired ceramic (LTCC). - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Chipless RFID sensing for dielectric property of light weight concrete(2021-05-19); ; - 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, Face Detection Approach to Classify Emotions Based on Facial Expression in Depressive Disorder(2023-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Dual-Band Band-Stop Filter using Multiple Hexagonal Microstrip Line for Chipless RFID Sensor(2023-01-01); ; Torrungrueng, DanaiThe dual-band band-stop filter using a hexagonal-shape microstrip line is presented in this paper. The chipless RFID with the band-stop filter used to determine the relative permittivity of material under test and identify characteristic based on the unique responded signal from the chipless RFID sensor. This paper proposed the multiple microstrip line structure with a quarter-wavelength transformer to generate an identification (ID) code, i.e., ID-01, ID-10, and ID-11 at the center frequency of 2.2 GHz and 2.7 GHz. From the results, the proposed chipless RFID sensor can be identified and determined the relative permittivity of the LWC.