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从模式保留和转换的角度,过模波导器件可分为模式转换器、模式保留器和模式综合器.传统方法只解决其中一种器件的设计或者对器件的某个指标进行改进.本文在深入分析耦合波理论之后,提出了过模波导器件的迭代设计方法,从原理上解决了过模波导器件的设计问题.该方法能够统一设计三类过模波导器件,通过添加不同的结构控制方法,可得到转换效率更高、带宽更宽、结构更紧凑、满足不同工程需求的器件,而且还能有效设计一些新型器件.给出了两个设计实例:双频TM01—TE11模式变换器和光壁馈源喇叭.双频TM01—TE11模式变换器的两个工作频点为8.75GHz和10.3GHz,波导半径为16mm,在两个频点转换效率为99%以上.光壁馈源喇叭实现TE11模式向高斯束的转换.CST仿真结果验证了这两个器件设计的正确性和有效性.
From the viewpoint of mode reservation and conversion, over-mode waveguide devices can be divided into mode converters, mode preservers and mode synthesizers. The traditional method only solves the design of one of the devices or improves an index of the device. After analyzing the coupling wave theory, an iterative design method for overmodular waveguide devices is proposed, which solves the design problem of overmodulated waveguide devices in theory. This method can uniformly design three types of overmodulated waveguide devices. By adding different structure control methods, We can get more conversion efficiency, wider bandwidth, more compact structure to meet different engineering needs of the device, but also effectively design some new devices.Analyzed two design examples: dual-band TM01-TE11 mode converter and optical wall-feed Source speaker. The dual-frequency TM01-TE11 mode converter has two operating frequency points of 8.75GHz and 10.3GHz with a waveguide radius of 16mm and a conversion efficiency of over 99% at two frequency points. Gaussian beam conversion.CST simulation results verify the correctness and effectiveness of the design of these two devices.