KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Access type: UnknownSubject: search.filters.subject.Dielectric material

Search Results

Now showing 1 - 4 of 4
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Chipless RFID sensing for dielectric property of light weight concrete
    (2021-05-19)
    Suwalak, Rattapong
    ;
    Phaebua, Kittisak
    ;
    Phongcharoenpanich, Chuwong
    ;
    Lertwiriyaprapa, Titipong
    ;
    Pathoumvanh, Somsanouk
    This paper presents a passive chipless RFID tag (Electromagnetic sensor) based on the modified printed monopole antenna with a frequency filter technique. The proposed chipless RFID sensor is the wireless sensor technology with the nondestructive technique (NDT) testing. This proposed RFID tag is designed to obtain both determination and identification (ID) properties for a sensor application. To determine the dielectric constant of MUT under test, the circular monopole tag antenna is modified using adding the elliptical shape to achieve the wideband operating frequency. Moreover, this sensor is used the stripline frequency filter technique to obtain the 1-bit ID at the frequency of 2.77 GHz. The CST Microwave Studio simulator program uses to design and optimize the passive chipless RFID parameters. Simulated results show the proposed chipless RFID sensor can identify and determine the dielectric property of the LWC under test.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Optimizing the properties of vulcanized compounds for foodstuff conveyor belts in industrial microwave per-heating
    (2018-01-01)
    Limhengha, Suphatchakorn
    ;
    Sriseubsai, Wipoo
    This research finds a natural rubber-based material with good dielectric properties and low cost for a foodstuff conveyor belt (FCB) that can be heated with microwaves. For this purpose, epoxidized natural rubber-50 (ENR50) and standard Thai rubber 5L (STR5L) were mixed with a filler mixture of silica and magnesium carbonate. The FCB compound with filler (FCBcF) yielding the best vulcanization time, and the best mechanical, dielectric and dynamic properties, was selected for further study. The optimal FCBcF, ENR50:SiO<inf>2</inf>:MgCO<inf>3</inf> (100:40:40) with microwave pre-heating at 2.45 GHz and 340 W for one minute before vulcanization, was well cross-linked and strongly converted the microwaves to heat. FCBcF also showed satisfactory mechanical properties with reduced cost of raw materials and reduced the curing time by 50% per round. The results demonstrate that pre-heating of FCBcF prior to vulcanization reduces the time and cost of fabricating FCBs, providing long-term economic and environmental benefits.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Dual-band chipless RFID sensor for a material quality monitoring application
    (2017-01-17)
    Suwalak, Rattapong
    ;
    Lertsakwimarn, Kittima
    ;
    Phongcharoenpanich, Chuwong
    ;
    Torrungrueng, Danai
    The dual-band chipless RFID sensor is proposed to employ as a wireless material quality monitoring application. A printed perpendicular rectangular loop tag and a printed concentric rectangular loop tag are designed and optimized using the CST Microwave Studio program. The chipless RFID sensors are located on a material surface to determine qualities of a material under test. From numerical results, it is found that the proposed dual-band chipless RFID-sensor has a significant different radar cross section (RCS) compared with the single-band one. Therefore, both RFID sensors can be used together in the material quality monitoring system to improve the accuracy.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Numerical electromagnetic analysis with the PEEC method
    (2015-01-01)
    Yutthagowith, Peerawut
    The conventional full-wave formulation of the partial element equivalent circuit (PEEC) method was derived from the mixed-potential integral equation (MPIE) for the free space by A. E. Ruehli in 1974. The final results are interpreted Maxwell’s equations to a circuit domain by inductance, capacitance, and resistance extraction including retardation in theory. In that time, the retardation is neglected because the minimum wavelength corresponding to the considered maximum frequency is longer than dimensions of an interested domain. His development is based on the concept of inductance and capacitance extraction, which was firstly introduced by Rosa in 1908, and further developed by Grover in 1946 and Hoer and Love in 1965. Despite the fact that the PEEC method has an exact field theoretical basis, it was not primarily developed for the computation of electromagnetic fields. Instead, the circuit designer has a tool at hand to analyze the parasitic effects on connecting structures of circuits without leaving the familiar area of a network theory. This method was considerably developed further in the 1990s where retardation, external field excitation, and the treatment of a dielectric material were investigated.