Title :
Dispersive FDTD modeling on multi-layer left-handed meta-materials for near/far field imaging at microwave frequencies
Author :
Hao, Y. ; Lu, L. ; Parini, C.G.
Author_Institution :
Dept. of Electron. Eng., London Univ., UK
Abstract :
´Perfect´ imaging in left-handed meta-materials (LHMs) is constrained by evanescent wave losses. A multi-layer LHM structure can be deployed to reduce the losses, particularly in near field imaging. In this paper, we demonstrate using dispersive FDTD simulation how the multiple-layer LHM structure is used to ´guide´ evanescent waves with very little attenuation over large stack thickness in near field imaging at microwave frequencies. Effect of the multi-layer structure on far field imaging is also presented. The theoretical prediction is verified by FDTD simulation with good agreement.
Keywords :
composite materials; finite difference time-domain analysis; losses; microwave imaging; multilayers; dispersive FDTD modeling; dispersive FDTD simulation; evanescent wave guiding; evanescent wave losses; far-field microwave imaging; microwave frequencies; multi-layer LHM structure; multi-layer left-handed meta-materials; near-field microwave imaging; perfect imaging; stack thickness; Dispersion; Finite difference methods; Lenses; Maxwell equations; Microwave frequencies; Microwave imaging; Numerical simulation; Permeability; Slabs; Time domain analysis;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1220355
