A compact filtering crossover utilizing substrate integrated waveguide (SIW) quintuple-mode resonator (QMR) technology is proposed for the first time. Benefiting from this technology, the proposed crossover firstly breaks the status quo that SIW crossover filtering response is only concentrated in single passband, thereby extending the applications of the SIW crossovers. In design, the QMR is derived by embedding metal-via holes in the conventional SIW resonant cavity, thus to produce quintuple resonant modes featuring with specific electric distributions. Next, by dividing these modes into two groups, a triple-mode bandpass filter (BPF) channel and a single-mode dual-band BPF channel are both realized. To implement two flat passband channels, there are two SIW cavities cascaded. And also, the isolation between two channels is implemented by employing the orthogonal characteristic. In this way, a crossover is implemented. The proposed design method can be a good candidate for developing SIW multi-band filtering crossovers. For verification, an example circuit has been designed, fabricated, and measured.

中文翻译：

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基于SIW五元模谐振器的紧凑型滤波分频设计

首次提出了一种利用衬底集成波导 (SIW) 五元模谐振器 (QMR) 技术的紧凑型滤波分频器。受益于该技术，所提出的分频器首先打破了SIW分频器滤波响应仅集中在单通带的现状，从而扩展了SIW分频器的应用。在设计中，QMR 是通过在传统的 SIW 谐振腔中嵌入金属通孔来获得的，从而产生具有特定电分布的五重谐振模式。接下来，通过将这些模式分为两组，实现了三模带通滤波器（BPF）通道和单模双频 BPF 通道。为了实现两个平坦的通带通道，需要级联两个 SIW 腔。并且，两个通道之间的隔离是利用正交特性实现的。这样就实现了交叉。所提出的设计方法可以很好地用于开发 SIW 多频带滤波分频器。为了验证，我们设计、制造和测量了一个示例电路。