Electromagnetic fields and transmission properties in tapered hollow metallic waveguides.
Electromagnetic fields and transmission properties in tapered hollow metallic waveguides.
复制标题
锥形空心金属波导中的电磁场和传输特性。
DOI：
10.1364/oe.17.000034
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发表时间：
2009
期刊：
影响因子：
3.8
通讯作者：
D. Fan
中科院分区：
文献类型：
--
作者：
Xiahui Zeng;D. Fan
本文详细分析了锥形空心金属波导中横电（TE）和横磁（TM）本征模的电磁场空间分布，并讨论了这两种本征模的传输特性。推导出电磁场分量、衰减常数、相位常数和波阻抗的空间分布的显式解析表达式。利用数值计算得到的精确本征值，研究了波导的传输特性与锥角、模式以及波导长度的关系。结果表明，所有的模式从传播通过过渡到消逝区的连续运行和衰减的值增加的距离锥顶点和锥角减小。不能实现纯传播模式和纯消逝模式之间的严格区分。在锥形空心金属波导中，随着离锥顶距离的减小，一个接一个的模达到截止。
We analyze the electromagnetic spatital distributions and address an important issue of the transmission properties of spherical transverse-electric (TE) and transverse-magnetic (TM) eigenmodes within a tapered hollow metallic waveguide in detail. Explicit analytical expressions for the spatital distributions of electromagnetic field components, attenuation constant, phase constant and wave impedance are derived. Accurate eigenvalues obtained numerically are used to study the dependences of the transmission properties on the taper angle, the mode as well as the length of the waveguide. It is shown that all modes run continuously from a propagating through a transition to an evanescent region and the value of the attenuation increases as the distance from the cone vertex and the cone angle decrease. A strict distinction between pure propagating and pure evanescent modes cannot be achieved. One mode after the other reaches cutoff in the tapered hollow metallic waveguide as the distance from the cone vertex desreases.