Design A Wideband Electromagnetic Absorber Using Carbon Nano-composite

Document Type : Research Paper

Authors

Abstract

Normally, carbon compounds have proper electrical absorption in microwave frequencies. To enhance the magnetic absorption these compounds, nanoparticles impurities such as ferrites, sandast and metal particles are added to them. In this paper, a carbon Nano-composite electromagnetic absorber is proposed. Utilizing the electromagnetic properties of the some previous reported carbon Nano-composite materials, the proposed multi-layer absorber is designed in X band (8.2-12.4 GHz) frequencies. The absorption characteristics of the absorber are calculated by analytic transmission line method (TLM). The permittivity (ɛ) and permeability (µ) of the Nano-composite materials are derived from previous reported papers. Also, using modified local particle swarm optimization (MLPSO) method, the performance of the proposed absorber is improved. In X band frequencies, the return loss of the investigated absorber is less than -11.8 dB (94 percent absorption) with 3.3 mm thickness. Furthermore In this band, the maximum absorption value is about -42 dB for the proposed configuration.

Keywords


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