Radiation Absorbing Material (RAM) is used to absorb radiations of electromagnetic wave surrounding us. Thus, the multiple layers’ microwave absorber using biomass composite materials could be one of the solutions to address the problem. In order to effectively absorb the radiation of electromagnetic wave, the multiple layers’ absorber is characterized to optimize the performance of the absorber. The characterization is made by varying biomass composite material contents, thickness and other possible considerations. CST Microwave Studio software is first used to design and simulate the multiple layers’ absorber to estimate its performance. Development of multiple layers’ prototype is carried out to test its performance at free space environment. Free space dielectric measurement method is used to determine the value of multiple layers’ absorber dielectric. The dielectric value is then used in CST software in order to make the simulation more precise. Free space arch which is connected to Agilent Analyzer is used to measure absorption of multiple layers’ microwave absorber.
Agriculture waste has huge potential to be used as an alternative material for constructing microwave absorber which is typically used in an anechoic chamber. The existing microwave absorbers are normally manufactured from chemical substances. This project is proposing the use of a new composite biomass material namely coconut coir, for constructing microwave absorbers. Generally, pyramidal shape is chosen since it is commonly used in the industry. The major part of this project involves an intense study in designing and developing the best techniques to construct pyramidal shape microwave absorber. The frequency range investigated in this work is between 1GHz to 12GHz. Referring to the commercial absorber as the standard, the reflectivity performance of this coconut coir pyramidal absorber was thoroughly investigated in this research. It is then proven that the biomass material used in this study is found to have a significant impact on the microwave absorber performance.
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