Abstract
Electromagnetic absorbing materials with broadband, lightweight, wide-angle, and polarization-insensitive characteristics attracts extensive research interest recently, due to rapid advancement in radar detection techniques and communication devices. Three-dimensional printing is being employed to realize cost-effective structured electromagnetic absorbers that has lately become a common practice of improving radar stealth performance and shielding effectiveness. Structured absorbers permit realization of desired absorption characteristics by careful design of their geometrical structures. In this study, a two-layer structured microwave absorber using conductive ABS polymer is simulated. COMSOL Multiphysics environment is used to investigate the absorption characteristics of the designed structure. Under normal incidence, simulation results revealed at least 90% of absorption from 7.2 GHz to 18.0 GHz for both Transverse Electric (TE) and Transverse Magnetic (TM) polarizations. Oblique incidence results for TE polarization indicate that the absorption rate is more than 90% in the whole range of 7.2–18 GHz frequency band up to 450 while the absorption rate is more than 80% for 600 incident waves. The absorption rate is more than 90% in the 7.2-18 GHz range for oblique incidences of up to 300 only for TM polarization, but greater than 70% at 450 incident angles. Additionally, the designed absorber is independent of the polarization of the incident wave. As a result of the exhibited favourable absorption characteristics, the studied absorber provides great potentials for its experimentation and practicability using the low-cost 3D printing manufacturing process
Highlights
In recent years, technological advancements in communication devices and radar detection techniques have increasingly brought about electromagnetic interference (EMI) and radiation problems, which incur the urgent need for radical electromagnetic interference shielding devices for military and civilian applications
This is a confirmation of the precision, reliability, and accuracy of the COMSOL Multiphysics numerical solver used in the present work, relieving us of prompt experimental work for the validation of the subsequent simulation results
Based on the complex relative permittivity and permeability of the conductive Acrylonitrile Butadiene Styrene (ABS) measured by Ren & Yin, (2018), the absorptivity of the two-layer structured microwave absorber (SMA) was simulated and calculated from the equation of absorption strength given in Equation (1), using the COMSOL Multiphysics’ RF module based on finite element method
Summary
Technological advancements in communication devices and radar detection techniques have increasingly brought about electromagnetic interference (EMI) and radiation problems, which incur the urgent need for radical electromagnetic interference shielding devices for military and civilian applications. As devices designed to effectively absorb incident electromagnetic radiation by transforming it into ohmic heat or other forms of energy, electromagnetic (EM) wave absorbers are often used for shielding (Ahmad et al, 2019). Threedimensional (3D) printing technology has attracted massive attention due to its many advantages like near-complete design freedom, flexibility, design complexity, cost efficiency, and high sustainability (Guo et al, 2019). This has inspired researchers in the microwave field to explore 3D printing for the manufacturing of components like antennas, waveguides, and absorbers (Kjelgard et al, 2018). The study offers great potentials for its experimentation and practicability using the low-cost 3D printing manufacturing process
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