中文摘要：

通过对谐振型左手材料的理论分析,提出了一种新型双通带左手材料的单元结构.该结构由E型和双谐振环形构成的谐振器与金属线组合而成,其中谐振器实现负磁导率,金属线实现负介电常数.利用电磁仿真软件,分析该材料单元结构的谐振特性,提取该结构的折射率、波阻抗以及介电常数、磁导率.仿真结果表明：该结构在其工作频段内存在2个通带,并且在这2个通带内该结构都具有左手特性.

英文摘要：

A novel dual-band left-handed materials（ LHM） structure is proposed which is composed of a copper wire and a resonator with double SRRs and a E ring. Resonators are used to achieve negative permeability and wires are used to achieve negative permittivity in the structure. The resonant characteristics of the structure are simulated. The refraction index,the wave impedance,the permittivity and the permeability are evaluated. The simulated results show that the proposed structure exhibits double pass-band left-handed characteristics.