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幾種波導(dǎo)中電磁波傳播的一般討論
幾種波導(dǎo)中電磁波傳播的1般討論
摘要：電磁波在波導(dǎo)管內(nèi)空間中傳播，而金屬管壁作為電磁場存在的邊界制約著管內(nèi)電磁波的存在形式。本文在得出求波導(dǎo)中電磁波的基本方程后，針對3種不同幾何邊界的波導(dǎo)管（矩形、3角形、圓形）進(jìn)行討論，導(dǎo)出了電磁波在矩形波導(dǎo)、3角形波導(dǎo)和圓形截面的空心波導(dǎo)中傳播的基本方程。3種波導(dǎo)均能傳播TE波TM波，不能傳播TEM波。本文同時討論了相關(guān)的波型和截止頻率等問題。
關(guān)鍵詞：波導(dǎo)；電磁波的波型；邊界條件；截止頻率
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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