零电磁材料特性模拟及分析
Simulation and analysis of zero-electric and zero-magnetic materials
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摘要: 利用时域有限差分法分别模拟了线源、TM波和偶极子激励下零电磁材料的角度滤波和波形变换特性。仿真结果表明:当电磁波的入射方向垂直于零电磁材料表面时，电磁波可完全穿过零电磁材料；对不同表面形状的零电磁材料，透射波的相位完全由材料输出面决定；在线源或偶极子上覆盖一层输出面为平面的零电磁材料，其辐射可变换成平面波，并且多个线源或偶极子组成的天线阵，单元天线的数目增加至N个时，其辐射场强也提高为N0.5倍。Abstract: Waveform converting and angular filtering properties of zero-electric and zero-magnetic(ZEM) materials slab were simulated under line source, TM wave and dipole irradiation, respectively, using finite-difference time-domain(FDTD) method. Simulation results show that electromagnetic wave can tunnel through the ZEM materials when the wave impinges on the entrance face of the materials perpendicularly; the phase pattern of the transmitted wave is dependent on the exit faces of ZEM materials; when the electromagnetic waves emitted from a line source or dipole transmit through a ZEM materials slab with planar exit face, it can be transformed into perfect plane waves. Moreover, the ZEM materials can be used in the design of antenna array. The radiation intensity of the ZEM material-assisted ante
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