提出了一种在圆波导中添加金属分割片及半边金属管壳的结构以实现圆波导TM01-TE11模式转换。通过金属分割片将圆波导分成两个半圆区域: 其中一个半圆区域为空波导, 另一半圆区域为填充一定厚度金属管壳的空波导。在S波段对设计的中心频率为2.8 GHz的物理模型进行数值模拟与实验研究, 模拟结果表明: 在中心频率2.8 GHz转换效率为99.56%, 反射率低于0.01; 在2.716~2.946 GHz频带内转换效率大于90%, S11小于-10 dB。实验中测试到的S11参数与模拟结果基本一致, 证明了该变换器技术方案的可行性和模拟结果的正确性。

A circular waveguide TM01-TE11 mode converter filled with metal shell and metal plate is proposed . The circular waveguide is split into two semi-circle sectors: one semi-circle sector is a regular empty waveguide, the other is an empty semi-circle waveguide filled with a metal shell and metal plate to adjust its radius. The numerical simulation results show that the reflection is below 0.01 and the conversion efficiency reaches 99.56% at the center frequency 2.8 GHz, and the S11 is below -10 dB and the conversion efficiency exceeds 90% at the frequency range from 2.716 GHz to 2.946 GHz. The results of S11 obtained by experiment are in agreement with that of the simulation, which validates the design and simulation of the mode converter.