Performance Evaluation of Flat Shape Absorbers Coated with Multi-Layer Biomass Composite

Microwave absorber is one of the main components used widely in anechoic chambers for antenna measurement. It is also used to absorb unwanted radiations in electronic products and other applications. This paper presents an investigation on the performance of flat shape microwave absorbers coated with biomass composite namely sawdust carbon and palm ash composite. The layer of biomass composite applied on the surface of this flat shape absorbers was found to contribute significant impact on the performance. This study is also looking at the impact of using two different board materials that is cardboard and plywood as the base of the absorbers. The wave frequency ranging from 8GHz to 12 GHz was chosen for the purpose of this study

Performance Study of Egg Tray Microwave Absorber

This paper proposes the physical models of a threelayer egg tray microwave absorber that contains biomass material as the design. The absorbing materials were prepared in three layers: carbon, palm ash and a mixture of coconut shell granular with carbon. To verify the performance of the absorber, it was modeled and measured by free space arch reflectivity measurement to determine the absorption level in a frequency range of 8 GHz to 12 GHz. The absorption level resulting from this investigation were then analyzed and discussed. The investigation shows that palm ash granular with carbon can increase the absorption level performance. Thus, the material has the potential to be used in electromagnetic absorption