几种波导中电磁波传播的一般讨论

几种波导中电磁波传播的1般讨论
 
摘要：电磁波在波导管内空间中传播，而金属管壁作为电磁场存在的边界制约着管内电磁波的存在形式。本文在得出求波导中电磁波的基本方程后，针对3种不同几何边界的波导管（矩形、3角形、圆形）进行讨论，导出了电磁波在矩形波导、3角形波导和圆形截面的空心波导中传播的基本方程。3种波导均能传播TE波TM波，不能传播TEM波。本文同时讨论了相关的波型和截止频率等问题。
关键词：波导；电磁波的波型；边界条件；截止频率

A Discussion On The Transmission Of Electromagnetic Waves In Some Waveguides
 
Abstract:  Electromagnetic waves transmit in space inside waveguide , and the metal wall as the boundary condition of the existence of electromagnetic fields restrict the form of electromagnetic waves. Based on the basic equations of electromagnetic waves transmit in waveguide, then focus on three different geometric border waveguide (rectangular, deltaic, cylindrical) for discussion ,the basic equations of electromagnetic waves in rectangular waveguide , deltaic waveguide and cylindrical waveguide are got. Three waveguides can all transmit TE waves and TM waves, but can not transmit TEM waves . The modes of electromagnetic wave and threshold frequency related to three waveguides are also discussed.
Keywords:  waveguide ; modes of electromagnetic wave ; boundary condition ; threshold frequency
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