Design and development of microwave absorber using waste materials
Sugarcane bagasse is a potential agricultural waste to design the pyramidal microwave absorber to be used in radio frequency (RF) anechoic chamber for testing application. An RF anechoic chamber is a shielded room covered with absorbers to eliminate unwanted reflection signal. In this work, sugarca...
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| Format: | Thesis |
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| Language: | English |
| Subjects: | |
| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78025/3/Liyana.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78025/5/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78025/6/Full%20text.pdf |
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| Summary: | Sugarcane bagasse is a potential agricultural waste to design the pyramidal microwave absorber to be used in radio frequency (RF) anechoic chamber for testing application. An RF anechoic chamber is a shielded room covered with absorbers to eliminate
unwanted reflection signal. In this work, sugarcane bagasse from the sugar industry and rubber tire dust from tire wear have been used. Both of the wastes have lossy carbon
contents naturally, which has made them suitable as the raw materials for the
fabrication of the low cost microwave absorbers. The dielectric constant of the
sugarcane bagasse had been measured using the Dielectric Probe Technique and
Software of Agilent 85071E using Transmission Line Technique. Microwave absorbers
are made of two main components, a filler material that does the absorption, and a
material matrix to hold the filler. In dielectric materials, the most crucial properties that
enable them to be applicable as microwave absorbers are the dielectric constant and the
loss factor which is the dissipation of energy in the material. Generally, dielectric
material absorbers are fabricated by the combination of fillers in a polymer matrix. In
this work, the fillers are the agricultural waste which is sugarcane bagasse (SCB) and
rubber tire dust (RTD) from tire wear whereas the polymer matrix is unsaturated
Polyester Resin RP9509 (UPR) which is rigid, flexible and electromagnetically
transparent polymer. In this work, the sugarcane bagasse also has been mixed with
rubber tire dust (RTD) to investigate their performance. The microwave absorber using
sugarcane bagasse had been designed and simulated in the CST Microwave studio
software. The measurement of waveguide technique has been used to check the
reflectivity performance. The microwave absorber has been investigated in microwave
frequency range between 1 GHz to 18 GHz. The results show that the sugarcane
bagasse has the potential used as the base material in developing the microwave
absorber and can operate in that range of frequency successfully. The adding of the
filler which is rubber tire dust increased the performance of the microwave absorber.
These absorbers were designed on the basis of the wave attenuation and depth of
penetration data and their EMC performance was evaluated in terms of bi-static
reflectivity performance. The performance of the absorbers was found to be below -10
dB. The different concentration of the filler were being measured and the reflectivity
was found to be better then -20 dB when the increasing value of rubber tire dust were
added. |
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