外加恒定磁场复合微波媒质负折射率条件

以亚铁磁媒质-YIG为基体,在其中嵌入金属导体线阵列是人工合成负折射率微波媒质的一种新方法。该方法采用了复合媒质磁导率张量的修正有效媒质理论,并推导出复合媒质介电常数张量的修正有效媒质理论,把在恒定磁场作用下复合媒质宏观上等效为一种磁导率和介电常数都为各向异性的媒质。分析得到了等效磁导率和等效介电常数张量,做出了色散曲线,获得了负折射率条件。

NRI Condition of Composite Microwave Medium under an External Magnetic Bias Field

Incorporating array of metallic wires into the host media, such as ferrimagnet YIG under an external magnetic bias field, is a novel method to synthesize negative refractive index (NRI) material. A modified effective medium theory of composite medium permittivity tensor is deduced. In our theory, the composite medium in the mass are transformed into an equivalent media that both permeability and permittivity are anisotropic. The effective permeability and permittivity tensors are calculated, the dispersive curves are presented, and the negative refractive condition is obtained by analysis.