The objective of this study is to try to find a canonical solution to realise transversal bandpass filters (BPFs), especially transversal BPFs with high order. For this purpose, first, a new configuration composed of coupled lines and transmission lines is proposed. After a series of simple transformations and approximations executed, the proposed configuration is simplified to a circuit with four paths between the source and load, and each path contains one half-wavelength resonator. Then based on the modularity of transversal filters, a dual-mode resonator is used to replace the half-wavelength resonator in each path. Thus, the order of transversal BPF could be extended to five, six and even higher. It is shown that the proposed configuration could realise arbitrary BPFs specified by a transversal coupling matrix, including single-passband filter with multiple transmission zeros, self-equalised BPF and multi-passband filters. In final, a class of BPFs is synthesised, designed and measured to prove the validity of the approach.

中文翻译：

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横向带通滤波器的规范合成

这项研究的目的是试图找到一种规范的解决方案，以实现横向带通滤波器（BPF），尤其是高阶横向BPF。为此，首先提出一种由耦合线和传输线组成的新配置。经过一系列简单的变换和逼近，所提出的配置简化为在源和负载之间具有四个路径的电路，每个路径包含一个半波长谐振器。然后，基于横向滤波器的模块化，使用双模谐振器代替每个路径中的半波长谐振器。因此，横向BPF的顺序可以扩展到五个，六个甚至更高。结果表明，所提出的配置可以实现由横向耦合矩阵指定的任意BPF，包括具有多个传输零点的单通带滤波器，自平衡BPF和多通带滤波器。最后，对一类BPF进行了综合，设计和测量，以证明该方法的有效性。