Innovative Kenaf-Brick Composite for Effective Microwave Absorption

A growing and intense interest in the technology of microwave-absorbing materials has come from the rapid development of electronic systems and telecommunications. Electromagnetic waves can penetrate a small building, leading to a significant decline in absorption ability and severely damaging human health. The composition of kenaf material as an absorbing material is being studied to enhance the absorption performance of brick absorbers. Kenaf material can develop porous brick, thus affecting the absorption performance of the corresponding brick. Porous carbon materials demonstrate significant potential in absorbing electromagnetic waves. This is because of their ultra-low density, large surface area and great ability to lose dielectric. The brick absorbers are measured with two orientations, horizontal and vertical, representing different levels of wall thickness. The Arch space-free method from the Naval Research Laboratory (NRL) takes measurements from 1GHz to 12GHz.The results indicated that the vertical orientation performs better than the horizontal orientation. When assembled vertically, porous bricks can make a more complex and winding path for microwaves, maximising the ability for the waves to interact and be absorbed.