Dual-band composite right/left-handed transmission lines with the nonreciprocal phase shift approximately proportional to the operating frequency are proposed and demonstrated by using normally magnetized ferrite microstrip lines. The nonreciprocal phase shift can be dynamically controlled by changing the externally applied dc magnetic field. Dynamic change in the nonreciprocal phase gradient along the line enables us to realize dual-band and unidirectional beam-scanning leaky-wave antennas without suffering from frequency-dependent change in the beam direction. A prototype nonreciprocal metamaterial line using polycrystalline yttrium iron garnet was fabricated and measured for verification of our basic concept.

中文翻译：

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具有与工作频率成比例的动态可控非互易相移的双波段复合右手/左手超材料线

通过使用正常磁化的铁氧体微带线，提出并演示了具有与工作频率近似成比例的非互易相移的双频带复合右/左手传输线。可以通过改变外部施加的直流磁场来动态控制单向相移。沿线的非互易相位梯度的动态变化使我们能够实现双频带和单向波束扫描漏波天线，而不会受到波束方向的频率相关变化的影响。制造并测量了使用多晶钇铁石榴石的非互易超材料原型线，以验证我们的基本概念。