Abstract
This paper presents the electromagnetic wave (EW) absorption properties in terms of complex permittivity and permeability of novel green composites coconut fiber coir and charcoal powder materials. The samples were fabricated using the raw agricultural waste coconut fiber coir, charcoal powder, epoxy resin and hardener with varied composition. The dielectric properties of the materials were characterized using two-port waveguide measurement method over the X-band frequency (8.2 – 12.4GHz). The average permittivity value measured is approximately 3.00 with 10wt% charcoal has the highest permittivity of 3.59. Apart from that, all samples exhibit good reflection loss of better than -25dB which means more than 99% absorption rate. The result shows the composite material is a promising organic material for electromagnetic absorber applications.
Highlights
As an electromagnetic wave travelling in free space penetrates into a material, the wave will be reflected, transmitted or absorbed [1]
The design of electromagnetic wave absorber is enhanced with material having electric or magnetic dipoles
The real parts of complex permittivity and permeability (ε′, μ′) are associated with electric and magnetic energy storage, whereas the imaginary parts (ε′′, μ′′) represent the dielectric and magnetic loss or energy dissipated within a material
Summary
As an electromagnetic wave travelling in free space penetrates into a material, the wave will be reflected, transmitted or absorbed [1]. Permittivity and permeability relate to a material’s ability to transmit an electric field and magnetic field respectively. Based on these parameters, materials are classified as either dielectric or magnetic. The real parts of complex permittivity and permeability (ε′, μ′) are associated with electric and magnetic energy storage, whereas the imaginary parts (ε′′, μ′′) represent the dielectric and magnetic loss or energy dissipated within a material. The ratio of imaginary parts (energy loss) to the real parts (energy stored) is the loss tangent of the complex permittivity and permeability. For an electromagnetic wave absorber, high imaginary parts of complex permittivity and permeability will enable greater absorption
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