This Letter presents a miniaturised multi-channel millimetre-wave filter bank implemented by stripline and substrate integrated waveguide (SIW). Since the orthogonal transverse electric mode and transverse electromagnetic mode can coexist in the same hybrid structure cavity and be transmitted almost without mutual interference, embedding stripline into SIW to miniaturise the size of the filter bank is achievable. A prototype composed of four bandpass filter units working at X-band is designed, fabricated and tested. Measurement results show that the proposed device has four independent channels with a good quality of bandpass filtering and the isolation among ports of different filter units are relatively high. The proposed prototype has 39.5% volume reduction than traditional stacking structure as well as good scalability, which has broad prospects in the application of next-generation wireless communication system.

中文翻译：

---

小型多通道毫米波滤波器组

这封信提出了一种由带状线和衬底集成波导（SIW）实现的小型化多通道毫米波滤波器组。由于正交横向电模式和横向电磁模式可以共存于同一混合结构腔中，并且几乎没有相互干扰地被传输，因此可以将带状线嵌入SIW中以使滤波器组的尺寸最小化。设计，制造和测试了由四个在X波段工作的带通滤波器单元组成的原型。测量结果表明，该装置具有四个独立的通道，具有良好的带通滤波质量，并且不同滤波器单元的端口之间的隔离度较高。拟议的原型比传统堆叠结构的体积减少了39.5％，并且具有良好的可扩展性，