Impacts of Refraction Index Mismatch on Performance of Target Detection and Imaging by Using Flat LHM Lens
FANG Jie-Ran1, GONG Yu1, DONG Xiao-Ting1,2, WANG Gang1
1Department of Telecommunication Engineering, Jiangsu University, Zhenjiang 2120132Laboratory of Computational Electromagnetics, Darmstadt University of Technology, D-64289 Darmstadt, Germany
Impacts of Refraction Index Mismatch on Performance of Target Detection and Imaging by Using Flat LHM Lens
1Department of Telecommunication Engineering, Jiangsu University, Zhenjiang 2120132Laboratory of Computational Electromagnetics, Darmstadt University of Technology, D-64289 Darmstadt, Germany
摘要Refraction index mismatch between flat left-handed metamaterial (LHM) lens and its surrounding medium generally destroys the focusing of flat LHM lens and degrades the performance of near-field target detection by using flat LHM lens. For LHM lens of refraction index mismatch within ±30%, numerical simulations demonstrate that lenses with large refraction index may suffer less resolution degradation than lenses with small refraction index, and the enhancement of refocused microwave backscattered from target can be subsided by up to approximately 5.5dB. The refraction index mismatch will also shift the target position in the reconstructed image so that theoretical prediction of target position needs to be modified.
Abstract：Refraction index mismatch between flat left-handed metamaterial (LHM) lens and its surrounding medium generally destroys the focusing of flat LHM lens and degrades the performance of near-field target detection by using flat LHM lens. For LHM lens of refraction index mismatch within ±30%, numerical simulations demonstrate that lenses with large refraction index may suffer less resolution degradation than lenses with small refraction index, and the enhancement of refocused microwave backscattered from target can be subsided by up to approximately 5.5dB. The refraction index mismatch will also shift the target position in the reconstructed image so that theoretical prediction of target position needs to be modified.
FANG Jie-Ran;GONG Yu;DONG Xiao-Ting;WANG Gang. Impacts of Refraction Index Mismatch on Performance of Target Detection and Imaging by Using Flat LHM Lens[J]. 中国物理快报, 2008, 25(1): 286-289.
FANG Jie-Ran, GONG Yu, DONG Xiao-Ting, WANG Gang. Impacts of Refraction Index Mismatch on Performance of Target Detection and Imaging by Using Flat LHM Lens. Chin. Phys. Lett., 2008, 25(1): 286-289.
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