Gita Rabelsa, Debi Rianto, Ananda Putra, Cahya Edi Santosa, Josaphat Tetuko Sri Sumantyo, Yohandri
An anechoic chamber is a notable facility in developing radar technology, electromagnetic wave research, communications, satellite systems, and for the usage of both civil and military fields. In this work, the pyramidal particle board is designed and fabricated as radar absorber material (RAM) based on activated carbon of coconut shell that has extensive porosity and high absorption. Geometrically tapered microwave absorber such pyramidal are preferred due to their better performance. The pyramidal shape produces an impedance gradient which results in high reflectivity levels in anechoic chambers at both normal and off-normal angles of incidence. Pyramidal absorber material to be designed with a thin thickness, this be important where allows it to be used in limited buildings. The coconut shell activated carbon is mixed with resin which has high adhesive power, low water absorption, and high surface hardness. This pyramidal radar absorber was created with has many advantages such us high broadband performance, non-flammable, self-extinguishing, and resistant to high humidity conditions. The microwave simulation software is operated in obtaining the optimum geometry of the pyramidal. The fabricated pyramidal absorber is characterized using a Vector Network Analyzer (VNA) in the frequency range 2 to 8 GHz (C-band). Various parameters that influence the absorption performance of the pyramidal were investigated such as the percentage of resin added, the distance of the source port and angles between the signal source as well as the surface of the pyramidal radar absorber. The experimental results show that the absorption of the pyramidal board is very high and meets it for use as an absorbent material in anechoic chamber. © 2019 IEEE.
Faculty of Mathematics and Natural Science, Universitas Negeri Padang Jl. Prof Hamka Air Tawar Padang, Physics Department, Sumatera Barat, 25131, Indonesia; Josaphat Microwave Remote Sensing Laboratory, Center for Environmental and Remote Sensing (CEReS), Chiba University, Japan
