This article proposes a novel approach for extracted pole (EP) filter synthesis. The pole producing elements can be extracted without introducing phase shifters. It is made possible by extracting lowpass elements in the prototype without reducing the order of filter functions. Using the proposed elements as added redundancy, the nonideal effect in the physical model is absorbed by adjacent resonators. Those novel approaches break through the conventional framework in EP filter synthesis. The synthesized results do not introduce extra spikes caused by nonideal phase shifters in the conventional EP filters. The new theory enables the application of EP filters in broadband situations. This work also reveals the equivalence between the frequency-dependent couplings and the PPEs. The validity of the demonstrated method is illustrated via an 11-pole filter with two transmission zeros. The simulated and measured results have no extra spikes caused by the nonideal phase shifters, which verified the effectivity of the proposed theory.

中文翻译：

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没有理想移相器的新型提取极点滤波器的合成

本文提出了一种提取极点 (EP) 滤波器合成的新方法。可以在不引入移相器的情况下提取极产生元素。这是通过在原型中提取低通元素而不减少滤波器函数的阶数来实现的。使用建议的元件作为附加的冗余，物理模型中的非理想效应被相邻的谐振器吸收。这些新方法突破了 EP 滤波器合成中的传统框架。合成结果不会引入由传统 EP 滤波器中的非理想移相器引起的额外尖峰。新理论使 EP 滤波器能够在宽带情况下应用。这项工作还揭示了频率相关耦合和 PPE 之间的等效性。通过具有两个传输零点的 11 极滤波器说明了所演示方法的有效性。模拟和测量结果没有由非理想移相器引起的额外尖峰，这验证了所提出理论的有效性。