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Efficient FDTD method for analysis of mushroom-structure based left-handed materials

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5 Author(s)
Wu, W.-Y. ; Dept. of Electr. Eng., Nat. Sun Yat-sen Univ., Kaohsiung ; Lai, A. ; Kuo, C.-W. ; Leong, K.M.K.H.
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A finite-difference time-domain method, combined with thin-wire and thin-slot algorithms, which is used to analyse a metamaterial based on periodic mushroom structures, is proposed. This proposed method is suitable for analysing problems involving large structures with fine structural details. Several composite right/left handed (CRLH) metamaterial mushroom-based structures are investigated. A 19 times 8 flat lens and a parabolic lens structure composed of 410 unit mushroom cells are investigated and they demonstrate negative-refractive-index characteristics while operating in the LH region. The simulation and measurement results of one- and two-dimensional CRLH mushroom-based structures are compared. The periodic analysis for mushroom structures is also introduced. Only a single unit mushroom cell is required to present the phenomena of infinite periodicity with periodic boundary conditions

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Microwaves, Antennas & Propagation, IET  (Volume:1 ,  Issue: 1 )