A Design of W-band Broadband Ortho-mode Transducer
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摘要: W波段接收机系统能有效接收多条重要的射电天文分子谱线信息，对于天文观测和科学研究有重要意义。W波段正交模耦合器（Ortho-Mode Transducer，OMT）作为接收机系统实现极化分离的关键器件，其性能对接收机整体性能有重要影响。介绍了一款基于Boifot结构的W波段宽带正交模耦合器，并介绍了正交模耦合器的工作原理和设计流程。仿真结果表明，在70~116 GHz频带内，正交模耦合器相对带宽达到49.4%，回波损耗优于18.7 dB，交叉极化优于55.8 dB，端口隔离度优于54 dB。Abstract: The W-band receiver system can effectively receive many important spectral lines for radio astronomy observations, which is of great significance for astronomical observations and scientific research. As a crucial component of the receiver system, the W-band ortho-mode transducer is important to achieve polarization separation and it has a considerable impact on the overall performance of the receiver system. We design a W-band broadband OMT based on the Boifot junction and introduce the working principle and designing process of OMT. The simulation results show that the relative bandwidth of OMT reaches 49.4%, the return loss is better than 18.7 dB, the cross-polarization is better than 55.8 dB, and the port isolation is better than 54 dB in the 70-116 GHz band.
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Keywords:
- Ortho-Mode Transducer /
- broadband /
- Boifot junction /
- W-band
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