Umaisaroh Umaisaroh, Mudrik Alaydrus, Erfan Handoko, Nadio Alferinanda
Activated carbon derived from coconut shells has gained significant attention as an effective and sustainable absorber material. The process involves carbonizing coconut shells to create a carbon-rich base, followed by activation through heat and steam, leading to a porous structure with a vast surface area. In this research, coconut shell charcoal is used to make an absorber for microwave application. We used relative permittivity (ϵ) 3.178, relative permeability, (μ) 1.215 and dielectric loss tangent (σ) 0.0719 to simulate the material based of coconut shell charcoal. We investigate the absorption in terms of design and the size of the proposed absorber in the frequency region of 26.5 GHz to 40 GHz (Ka band). The optimal absorption was achieved with a transmission factor of -29.22 dB and -52.94 dB in both simulation and measurement. The absorption percentage > 99 % for the flat design of the coconut shell charcoal design with the thickness of 16.9 mm. © Published under licence by IOP Publishing Ltd.
Department of Electrical Engineering, Universitas Mercu Buana, Jalan Meruya Selatan No.1, Jakarta, 11650, Indonesia; Department of Physics, Universitas Negeri Jakarta, Jalan Rawamangun Muka, Jakarta, 13220, Indonesia
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