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应用基于有限元方法的仿真软件HFSS,分析和设计了圆形槽波导-波纹圆形槽波导模式变换器。变换器由具有渐变波纹深度的波纹圆形槽波导构成,可实现TE11到HE11的模式转换。分析表明,变换器的长度和第一个波纹的深度是影响其性能的主要因数。在保持变换器优化长度不变的条件下,调整波纹周期、增加波纹数目和波纹宽度对改善变换器的性能效果不明显。所设计的具有5个渐变深度波纹的模式变换器,在中心频率36GHz上回损可达30dB。变换器实测的结果与仿真分析之结论吻合较好。
The finite element method based simulation software HFSS was used to analyze and design circular slot waveguide - corrugated circular slot waveguide mode converter. The converter is made up of corrugated circular groove waveguides with a graduated ripple depth, enabling the mode conversion from TE11 to HE11. The analysis shows that the length of the converter and the depth of the first ripple are the main factors affecting its performance. Adjusting the ripple period, increasing the number of ripple and the width of the ripple can not improve the performance of the converter under the condition of keeping the optimal length of the converter unchanged. The designed mode converter with five deep-gradient gradients achieves a return loss of 30 dB at a center frequency of 36 GHz. The measured results of the converter are in good agreement with the conclusions of the simulation analysis.