In this paper, the influence of the cutting plane as well as the orientation of the cavities in cross-coupled W-band waveguide filters are investigated. When waveguide filters are manufactured with the commonly known CNC (computer numerical control) milling technique, at least one cutting plane is required. The position of this cutting plane has an impact on the composition of the cavities, the manufacturing accuracy, and on the maximal number of transmission zeros (TZs) introduced by a direct source to load (SL) cross-coupling. Similar filter set-ups therefore may show different performances depending on the position of this cutting plane. To examine all these effects, three similar fourth-order W-band filter set-ups are realized with distinct cutting planes and different oriented cavities. The filters are compared in terms of the sensitivity to manufacturing tolerances, the maximal number of TZs introduced by a direct SL cross-coupling as well as their spurious mode performance.

在本文中，研究了交叉耦合 W 波段波导滤波器中切割平面和腔体方向的影响。当使用公知的CNC（计算机数控）铣削技术制造波导滤波器时，至少需要一个切割平面。该切割平面的位置对型腔的组成、制造精度以及直接源到负载 (SL) 交叉耦合引入的传输零点 (TZ) 的最大数量有影响。因此，类似的过滤器设置可能会根据该切割平面的位置显示不同的性能。为了检查所有这些影响，三个相似的四阶 W 波段滤波器设置实现了不同的切割平面和不同定向的腔。