A wideband filtering phase shifter is proposed using a cascaded single line and coupled line as a shunt stub of the centre-coupled line. Such kind of a shunt stub provides the possibility to achieve wideband impedance matching, wideband phase shift, and multiple controllable transmission zeros (TZs) at the same time. The coupling between the shunt stubs of the practical layout can generate extra TZs and enhance the frequency selectivity. Compared with the state-of-the-art designs, the proposed one has wider bandwidth, more TZs and medium size, and the former cannot juggle bandwidth and size. Two prototypes at 1.76 GHz are designed with the relative operating bandwidth for 45°±3° (90°±4.2°) phase shift of 75% (76%), five TZs and the minimum return loss of 14.7 dB.

中文翻译：

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具有宽带宽和多个传输零点的滤波移相器

提出了使用级联单线和耦合线作为中心耦合线的分流短截线的宽带滤波移相器。这种分流短截线提供了同时实现宽带阻抗匹配、宽带相移和多个可控传输零点 (TZ) 的可能性。实际布局的分流短截线之间的耦合可以产生额外的 TZ 并增强频率选择性。与最先进的设计相比，所提出的设计具有更宽的带宽、更多的 TZ 和中等尺寸，前者无法兼顾带宽和尺寸。两个 1.76 GHz 原型设计具有 45°±3° (90°±4.2°) 相移 75% (76%)、五个 TZ 和 14.7 dB 最小回波损耗的相对工作带宽。