We report on a novel compact wideband 90° twist with performance tolerant to small geometry variation and hence improved manufacturability through direct milling. The experimental verification shows 44% fractional bandwidth with return loss better than 20 dB over the 140–220 GHz band. The performance, compactness, and tolerance to manufacturing inaccuracy make it very suitable for use in various waveguide systems from microwave to millimeter-wave range.

中文翻译：

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具有机加工公差布局的紧凑型 90° 波导扭曲的设计与实现

我们报告了一种新颖的紧凑型宽带 90° 扭曲，其性能可以容忍小的几何变化，因此通过直接铣削提高了可制造性。实验验证表明，在 140–220 GHz 频带内，44% 的部分带宽具有优于 20 dB 的回波损耗。性能、紧凑性和对制造误差的容忍度使其非常适合用于从微波到毫米波范围的各种波导系统。