Left-handed transmission characteristics of rectangular waveguides periodically loaded with ferrite
Left-handed transmission characteristics of rectangular waveguides periodically loaded with ferrite
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DOI：
10.1109/intmag.2005.1463707
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发表时间：
2005
影响因子：
2.1
通讯作者：
T. Ueda;M. Tsutsumi
中科院分区：
文献类型：
--
作者：
T. Ueda;M. Tsutsumi
提出了一种周期性填充切向磁化铁氧体介质的左手矩形波导，并利用模式匹配法对该结构的返波特性进行了数值分析。操作频率被选择为低于有效介电常数为负的矩形波导中的主导TE/sub 10/模式的截止频率。结果表明，在负磁导率频率区域存在返波模，在该区域静磁表面波模可以被支持，磁场剖面在每个截面上具有由一系列指数组成的类正弦曲线。此外，三维全波模拟，这表明，不期望的激励的静磁表面波模式横向传播沿着的铁氧体层的表面附近的输入端口起着一个Transformer的作用，从引导TE/sub 10/模式的后向波模式，反之亦然输出端口附近。
A left-handed rectangular waveguide periodically filled with tangentially magnetized ferrite medium has been proposed, and backward wave characteristics in the structure have been confirmed numerically by using a mode-matching method. The operational frequency is selected to be below the cutoff frequency for a dominant TE/sub 10/ mode in a rectangular waveguide where the effective permittivity is negative. The obtained results show that there exist backward-wave modes in the negative permeability frequency region where magnetostatic surface wave modes can be supported, and the field profiles have a sinusoid-like form composed of a series of exponentials in each section. In addition, three-dimensional full-wave simulation is demonstrated, which shows that unexpected excitations of magnetostatic surface wave mode transversely propagating along a surface of the ferrite layer near the input port plays a role of a transformer from a guided TE/sub 10/ mode to the backward wave mode and vice versa near the output port.