Experimental and Numerical Study of Electromagnetic Waves Shielding by Metamaterial Structures
Yi-Shen Chen1, Chin-Hsiang Cheng2, Hsin-Yu Tsai 3 and David. T. W. Lin4
1,2,3
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan.
4Institute of Mechatronic System Engineering, National University of Tainan, Tainan, Taiwan.
In this study, a new design of metamaterial structure with a layer of periodic metallic pattern and a layer of dielectric material is proposed to improve its shielding effects for electromagnetic wave [1-3]. A three-dimensional numerical simulation of the electromagnetic wave shielding behavior of a metamaterial structure is performed based on a commercial computer package. Effects of influential parameters of the metamaterial layers are predicted for different patterns and geometries. In parallel, the designed metamaterial structures are also fabricated for validation. It is found that when size of a cell, size of pattern or height of gap of the pattern is increased, frequency of shielding range is increased. For example, for a silver pattern at 0.5-mm width, as the pattern sizes are 5mm × 5mm, 6mm × 6mmand 7mm × 7mm,the frequencies of shielding range arefound to be6.5 GHz, 5.3 GHz and 4.3 GHz, respectively. On contrary, the predicted frequency of shielding range is found to be independent of solution domain. In experiments, the periodic metallic pattern is successfully formed by printing nanoscale silver particle ink on polyimide tape. The shielding effects at various frequencies of electromagnetic wave are measured by using a vector network analyzer. A comparison between the experimental and the numerical data shows a close agreement.
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