The Analysis of Electrically Large Left-Handed Metamaterial Based on Mushroom Structure Using FDTD Approach
A full wave finite-difference time-domain method (FDTD) combined with thin-wire and thin-slot algorithms to analyze a metamaterial fabricated with periodic mushroom structures, is proposed in this dissertation. This proposed method is suitable for analyzing problems involving large structures with fine structural details. A periodic analysis for mushroom structures is presented. Only a single unit mushroom cell is required to present the phenomena of infinite periodicity with the help of periodic boundary conditions (PBCs).
The composite right-/left-handed (CRLH) transmission line (TL) approach is introduced and used to approximate CRLH metamaterial through lumped L and C. Finally, several CRLH metamaterial mushroom-based structures are investigated. A 19 by 8 flat microwave lens and a parabolic microwave lens structure composed of 410 unit mushroom cells are investigated. These structures demonstrate negative refractive index (NRI) characteristics while operate in the left-hand (LH) region. The simulation and measurement results of one- and two-dimensional CRLH mushroom-based structures are compared.
Advisor:Chih-Wen Kuo; Kin-Lu Wong; Ken-Huang Lin; Tzyy-Sheng Horng; Tzong-Lin Wu; Yu-De Lin; Hsueh-Yung Chao; Ming-Cheng Liang
School:National Sun Yat-Sen University
School Location:China - Taiwan
Source Type:Master's Thesis
Keywords:mushroom structure finite difference time domain method left handed metamaterial
Date of Publication:06/19/2006