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# 第 15 章 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about ' 第 15 章' - jillian-fry

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［例1］波导中不能传播TEM波。

·由于波导要传输电磁能量。也就是说，必须要有 方向的Poyningting矢量，所以，它必须具有横向的电场 和磁场

·磁场 必须是封闭成圈的，因而只有如图a和b两种可能。

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• 根据Maxwell方程要求

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(c)有中心导体

(d)有中心电场

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［例2］矩形波导在z=0处接短路片，求波导内的场。在波导中心 处振荡按什么规律变化？并研究这种情况下功率容量与E0的关系。

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［解］这是一个实际问题。因为应用中波导总会接负载，而其中短路负载是最常用的，先写出入射场

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Emax=2E0

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［例3］深入研究矩形波导中TE10波广义传输线。

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