Analysis of edge slots in rectangular waveguide with finite waveguide wall thickness
Analysis of edge slots in rectangular waveguide with finite waveguide wall thickness
复制标题
有限波导壁厚矩形波导边缘槽分析
DOI：
10.1109/8.511820
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发表时间：
1996
影响因子：
5.7
通讯作者：
D. Chang
中科院分区：
文献类型：
--
作者：
Cheng;R. Wu;Powen Ilsu;D. Chang
在考虑波导壁厚有限的情况下，提出了一种计算具有显著特征的边槽导纳特性的新方法。应用变分反应理论推导了内外波导缝隙区电场的变分方程，并用有限元法求解。详细描述了槽区划分为三角形圆柱体的小单元以及每个单元的基函数。在壁厚为零的极限情况下，利用三角基函数的伽辽金方法将有限元分析简化为矩法分析。通过比较考虑和不考虑壁厚的数值结果，研究了波导壁厚对波导槽特性的影响。在典型的x波段波导中，忽略壁厚可能导致对边缘狭缝的严重低估，低估幅度可达14%。考虑有限壁厚的计算结果已与先前文献中发表的测量数据和精心设计的实验装置所获得的数据进行了核对。理论结果与实验结果吻合较好，证明了分析的有效性。
A novel analysis for computing the admittance characteristics of edge slots with a salient feature in successfully considering the finite waveguide wall thickness is presented. The variational equation for the electric field in the slot region between the inner and outer waveguide walls is derived by applying the variational reaction theory and solved by the finite-element method. The division of the slot region into small elements of triangular cylinders and the basis function for each element are described in detail. In the limiting case of zero wall thickness, this finite-element analysis is reduced to a moment-method analysis using Galerkin's approach with triangular basis functions. The effects of waveguide wall thickness on the characteristics of the slot are investigated by comparing the numerical results with and without considering the wall thickness. Negligence of the wall thickness may result in a severe underestimation of the resonant length by as large as 14% for edge slots cut in typical X-band waveguides. The computed results with the finite wall thickness taken into account have been checked with the measured data published in previous literature and those obtained by a carefully devised experimental setup. Good agreement between theoretical and experimental results is obtained to demonstrate the validity of the analysis.