A Study of Electromagnetic Absorption Performance of Modern Biomass Wall Tile

Abstract

Electromagnetic elimination was used to eliminate unwanted radiation that may interface with machinery or affect human health. The use of microwave absorbers has become necessary for an environment with a safe electromagnetic wave level. The objectives of this project are to design a microwave absorber as a modern biomass wall tile and to investigate the absorbing performance of the modern wall tile absorbers with different materials. The absorber was designed with similar shapes and different biomass materials. The concept of modern wall tile had been applied to design the absorbers in terms of their shape and dimension by using biomass materials. Biomass materials such as kenaf and coconut coir were used in the study due to their lightweight and environmental-friendly material behavior. The simulation was done using CST Suite Studio software to predict the preliminary result of the absorbers. The proposed designs of the modern wall tile from the CST simulation are then fabricated while the mixtures of the materials are moulded into a microwave absorber. NRL Arch free space method was used to determine the absorption performance of the modern wall tile absorbers at a frequency range from 1GHz to 12GHz. Both results of the simulation and free space measurement are analyzed and discussed. This study showed that absorber KCA has the best performance among all the absorbers with the absorption of more than -10 dB. The mixture of biomass material with carbon has a great absorption performance compared to the mixture of biomass material without carbon.

Computational investigation of various wedges electromagnetic wave absorbers on anechoic chambers

“…Unobstructed sound can be created when the wave is not affected much by behaviors such as reflection, absorption, deflection, diffraction, refraction, diffusion and is not affected by the effects of resonance [8]. Literature studies conducted by many researchers state that the selection of the medium material and the shape of the wedges significantly affect the absorption performance to produce a space without echo [9,10,11]. The perfect free-reflection of sound in anechoic chamber design provides precise measurement of noise source sound power levels, this condition is also ideal for calibrating electro-acoustic measuring instruments and measuring the performance of various electroacoustic products [12,13,14].…”