可多重聚焦电磁能量的左手材料结构
Structure of left-handed-materials for splitting electromagnetic energy
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摘要: 功分器在微波工程中广泛应用。基于有损耗的Lorentz模型的时域有限差分(FDTD)方法，分析模拟了左手材料(LHM)的平板结构和环状结构对电磁波源的不同聚焦特性。每个左手材料边界均可以对波源发出的波进行聚焦。同时通过比较，在对称结构中，每个聚焦点的电磁场幅度都相同。说明该左手材料结构可以对电磁波源进行多点聚焦。Abstract: The energy-splitter is widely used in microwave engineering. Finite-difference time-domain(FDTD) method is used to analyze and verify new accurate energy-split structures with perfectly matched lossy left-handed-material(LHM) slabs or ring. From these numerical simulations, the sub-energy-sources at the outer focusing image points of each LHM slab are generated. All of the sub-energy-sources have almost the same magnitude in such symmetric structures. The energy splitting effect of these new LHM structures can be seen.
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Key words:
- energy-splitter /
- fdtd method /
- left-handed material /
- multi-focus
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