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中文摘要：
提出了一种基于双Σ形金属条的双向型左手材料结构. 该结构由介质基板和两个反向对称放置在介质基板两侧的Σ形金属条构成, 在电磁波平行入射和垂直入射两种情况下, 都能够实现双负特性（ε〈0, μ〈0） . 通过利用HFSS软件仿真、等效参数提取, 分析验证了该结构在X波段具有双向特性和左手特性. 该结构的双向特性拓宽了电磁波的入射角度, 对左手材料的多维化和多向化发展提供了参考价值.
英文摘要：
A structure of two-dimensional incident left-handed metamaterial composed of double Σ-shaped metal strips is proposed. The structure consists of a dielectric substrate and two anti-symmetrical Σ-shaped metal strips on each side of it, and the structure presents double negative properties （ε〈0, μ〈0）, with electromagnetic waves being incident parallel or perpendicular to the substrate. With HFSS software, the two-dimensional incident left-handed properties of the structure are analyzed and verified in X waveband by means of spectrum analysis and effective parameters extracted from S parameters. The two-dimensional incident properties of the structure widen electromagnetic wave angle and are also of reference value for developing multi-dimensional incidence of the metamaterial.
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