A novel (patent pending) waveguide orthomode transducer (OMT) design is presented. The use of a common waveguide cross section with twofold rotational symmetry is proposed to mitigate the typical drawbacks of a two-probe OMT geometry. In particular, the cross-polarized electric field component may be reduced by introducing a twofold rotationally symmetric cross-sectional design with slant axes in the reference frame defined by the directions of the two coupling probes. Interestingly, it is also demonstrated that this solution may be used directly in the probing area to either reduce the cross-polarized field component or to reduce the probe-to-probe coupling. The aspect ratio of the required asymmetric section is close to 1, and the design has limited impact on other signals when used as an orthomode junction (OMJ) in multifrequency feed systems. Two designs, one with dual-linear operation and one with dual-circular operation, are optimized in K-band (17.7–20.2 GHz). Good agreement is found between simulated and measured data, validating the concept. This solution is of interest for the design of future multifrequency feed systems onboard broadband communication satellites.

中文翻译：

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具有双重旋转对称性的双探头波导正交模换能器

提出了一种新颖的（正在申请专利的）波导正模换能器 (OMT) 设计。建议使用具有双重旋转对称性的公共波导截面来减轻双探针 OMT 几何结构的典型缺点。特别地，可以通过在由两个耦合探针的方向限定的参考系中引入具有倾斜轴的双重旋转对称截面设计来减少交叉极化电场分量。有趣的是，还证明了该解决方案可以直接用于探测区域，以减少交叉极化场分量或减少探头到探头的耦合。所需的非对称部分的纵横比接近 1，在多频馈电系统中用作正交模式结 (OMJ) 时，该设计对其他信号的影响有限。两种设计，一种采用双线性操作，一种采用双循环操作，在 K 波段 (17.7–20.2 GHz) 中进行了优化。在模拟数据和测量数据之间找到了很好的一致性，验证了这个概念。该解决方案对未来宽带通信卫星上的多频馈电系统的设计具有重要意义。