Performance evaluation of biomass multilayer flat microwave absorber

Biomass multilayer flat microwave absorber is an innovation in the design of microwave absorbers. This research uses flat shape design and biomass materials targeting some improvement in terms of installation and fabrication. Coconut shells (granular), coconut shells (fine) and palm ashes are the biomass materials used to fabricate flat microwave absorber since previous study showed that they contain high percentage of carbon. The absorber shape, number of layers and biomass materials are the variables manipulated in the microwave absorption performance investigation. Free space dielectric measurement method is used to determine the absorption performance in the frequency range from 8 GHz to 12 GHz. The investigation shows that the flat microwave absorber fabricated with two layers of palm ash produced good absorption performance