Title :
Dispersive FDTD modeling on near field imaging in multi-layer left-handed meta-materials at microwave frequencies
Author :
Lu, Ling ; Hao, Yang ; Parini, Clive G.
Author_Institution :
Dept. of Electron. Eng., London Univ., UK
Abstract :
´Perfect´ imaging in left-handed meta-materials (LHMs) is constrained by surface wave losses in near field. A multi-layer LHMs structure can be deployed to reduce the losses particularly in near field imaging. Furthermore, we demonstrate how to use a multiple-layer LHMs structure with variable gap distance to enhance near field image over large stack thickness in near field imaging at microwave frequencies. The theoretical prediction is verified with good agreement using a causal two-dimensional dispersive FDTD simulation.
Keywords :
finite difference time-domain analysis; microwave imaging; slabs; dielectric medium; dispersive FDTD modeling; finite difference time domain; microwave frequencies; multilayer left-handed metamaterials; near field imaging; perfect imaging; surface wave losses; variable gap distance; Dispersion; Finite difference methods; Focusing; Microwave frequencies; Microwave imaging; Plasma simulation; Predictive models; Slabs; Surface waves; Time domain analysis;
Conference_Titel :
High Frequency Postgraduate Student Colloquium, 2003
Print_ISBN :
0-7803-8123-8
DOI :
10.1109/HFPSC.2003.1242307