In this article, a compact triple‐mode balanced passband filter with intrinsic common‐mode (CM) suppression is designed by using a single isosceles right triangle perturbed half‐mode substrate integrated waveguide (HMSIW) cavity. The perturbation metallic vias are introduced to tune the first three resonant modes of HMSIW cavity to form a passband. Furthermore, the planar differential microstrip‐pin feed structure is designed to excite the perturbed substrate integrated waveguide cavity. Under CM operation, when the substrate's height is less than λ_g/4, the space between perfect electric conductor and perfect magnetic conductor cannot transmit electromagnetic wave, so CM noise can effectively cut off at the planar differential feed structure in a wide frequency range. Finally, a prototyped prototype at 4.5 GHz is designed and fabricated, and measured results show good agreement with simulated ones.

中文翻译：

---

具有固有共模抑制功能的紧凑型三模HMSIW平衡通带滤波器

在本文中，通过使用单个等腰直角三角形扰动的半模衬底集成波导（HMSIW）腔设计了具有固有共模（CM）抑制的紧凑型三模平衡通带滤波器。引入扰动金属通孔以调谐HMSIW腔的前三个谐振模式以形成通带。此外，平面差分微带针馈送结构旨在激发被扰动的基片集成波导腔。在CM模式下，基板高度小于_λg时/ 4，完美电导体和完美磁导体之间的空间无法传输电磁波，因此CM噪声可以在较宽的频率范围内有效地消除平面差分馈电结构。最后，设计并制造了4.5 GHz的原型样机，测量结果与仿真结果吻合良好。