具有特定频段的左手材料构造与设计优化

Design and optimization of left-handed materials with specific frequency bands

为研究具有特定频段的左手材料设计方法.首先基于传输线理论构造了一种左手材料微观构型,采用S参数反演法进行数值仿真和等效传输线模型分析,说明了该构型在特定的尺寸条件下具有左手特性,并分析了尺寸参数对左手性能的影响.进而给出了在给定频率附近具有最大带宽、较小损耗的左手材料设计优化问题的数学模型,并给出了设计实例.数值设计结果验证了优化模型的适用性和正确性.

In this paper, a design optimization method for left-handed materials with specific frequency bands is proposed. A microstructure of the left-handed material is constructed based on the transmission line theory, and the properties of this material are simulated numerically with the S-parameter retrieval method and analyzed with equivalent transmission line model. The effects of the size parameters of the microstructure on the left-handed characters are analyzed. The analysis results verify that this structure does exhibit left-handed characteristics with appropriately sized microstructure. Then the mathematical model of the microstructure with maximized frequency band-width and lower loss at given frequencies is proposed, and examples are given. The design result confirms that the optimized model is applicable and accurate.