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本文论述了在给定的带宽范围内。波导的衰减常数在上限频率下为最小的波纹茧形波导的最佳截面形状,并用工程上便于制作的优化的近似茧形和圆角矩形波导来近似。借助于微扰理论给出了该类波导基模及邻近高阶模的截止频率和衰减常数的近似计算公式。结果表明,优化的茧形波导十分接近于最佳主模波导。
This article discusses the given bandwidth. The attenuation constant of the waveguide is the smallest optimum cross-sectional shape of the corrugated cocoon waveguide at the upper limit frequency and is approximated by an optimized, approximately cocoon-shaped and rounded rectangular waveguide that is easy to manufacture in engineering. With the help of the perturbation theory, the approximate formulas for calculating the cut-off frequency and the damping constant of the fundamental modes of the waveguide and the adjacent higher-order modes are given. The results show that the optimized cocoon waveguide is very close to the best main waveguide.