TE01-TE11模式变换器的迭代设计方法
Iteration design method for TE01-TE11 mode converter
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摘要: 对模式变换器的迭代设计方法做了改进：给出了合理的迭代步长初始值取值方式；在迭代时只考虑了贡献较大的几条耦合线，而忽略了贡献小的耦合线，从而改善带宽。利用改进的迭代设计方法设计了波导直径与自由空间波长比值为2.765 5的TE01-TE11模式变换器，总长度为600 mm，相对带宽为6%，中心频率转换效率为99.14%，总计算时间为40 s。利用CST软件进行了仿真验证，结果吻合较好。Abstract: Two improvements in the iteration method for mode converter design are presented, i.e. a reasonable initial step value in every iteration is given and coupled lines of less contribution are ignored to improve bandwidth. A TE01-TE11 mode converter is designed with the improved iteration method, whose ratio of waveguide radius to free space wavelength is 2.765 5. Simulation results show that its relative bandwidth reaches 6%, total length is 600 mm, and conversion efficiency is 99.14% at the central frequency. The total calculation time is 40 s. The CST simulation result agrees well with the coupled mode simulation one.
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Key words:
- mode converter /
- phase rematch method /
- iteration method /
- coupled mode theory /
- overmoded waveguide
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