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首页> 外文期刊>Journal of Electromagnetic Waves and Applications >Trapped mode phenomena in a weakly overmoded waveguiding structure of rectangular cross section
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Trapped mode phenomena in a weakly overmoded waveguiding structure of rectangular cross section

机译：矩形截面的弱过模波导结构中的陷波现象

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摘要

A general formula of the transmission coefficient derived from the Scattering Matrix Method (SMM) for reciprocal, lossless or lossy trapped mode structures is presented. Verifications of the theory by means of experiment and computer simulations (HFSS and Cascade) of the transmission coefficient are also presented. The rectangular cross section waveguide structure we considered consists of an uptaper, a straight uniform section, and a downtaper. The dominant TE10 mode can propagate through the structure whereas the TE30 mode is trapped within the center region of the structure. It is also shown that our formula reduces to that given by King and Marcatili [1] for the reciprocal and lossless case. The first five resonant frequencies and the transmission coefficient for the trapped mode structure have been calculated and compared to the results from the experiment and the computer simulations. At the resonant frequencies of the trapped mode, the transmitted power of the dominant TE10 mode may be reduced significantly, depending on the ohmic wall loss as well as the integrated coupling between the TE10 mode and the trapped TE30 mode. The effects of various waveguide aperture misalignments on the transmission coefficient are also discussed in this paper.
机译：提出了由散射矩阵方法（SMM）得出的互易，无损或有损陷波模式结构的透射系数的一般公式。还通过传输系数的实验和计算机模拟（HFSS和Cascade）对理论进行了验证。我们考虑的矩形横截面波导结构由一个上锥，一个直的均匀截面和一个下锥组成。主导的TE10模式可以在结构中传播，而TE30模式则被捕获在结构的中心区域内。还表明，对于互惠无损情况，我们的公式简化为King和Marcatili [1]给出的公式。已计算出前五个共振频率和陷阱模式结构的传输系数，并将其与实验和计算机仿真的结果进行了比较。在陷波模式的谐振频率下，取决于欧姆壁损耗以及TE10模式和陷波TE30模式之间的集成耦合，主要TE10模式的发射功率可能会大大降低。本文还讨论了各种波导孔径失准对传输系数的影响。

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