In this letter, new compact third-order single- and dual-band filters on a hexa-modes half-mode substrate integrated waveguide (HMSIW) resonator with loaded H-shaped slot are presented. For the single-band design, the TE101 mode, TE201 mode, and the lower part of H-shaped slot mode are utilized to realize the third-order filtering response. By properly allocating the high-order modes, wide-stopband performance is also obtained. For the dual-band design, the TE101 mode, TE201 mode, and the lower part of H-shaped slot mode are used to realize the third-order lower passband, and the TE202 mode, TE302 mode, and the upper part of H-shaped slot mode are used to realize the third-order upper passband. The operating frequency and bandwidth of the proposed single-/dual-band filters both can be independently controlled. To validate the design concept, two prototypes of third-order single- and dual-band HMSIW bandpass filters (BPFs) are designed, fabricated, and tested. The simulated and measured results agree well with each other.

中文翻译：

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带负载 H 形槽的六模半模基板集成波导谐振器上的紧凑型单频和双频滤波器

在这封信中，介绍了带有负载 H 形槽的六模半模衬底集成波导 (HMSIW) 谐振器上的新型紧凑型三阶单频和双频滤波器。对于单频段设计，利用TE101模式、TE201模式和H型槽模式的下部来实现三阶滤波响应。通过适当分配高阶模式，还可以获得宽阻带性能。双频设计采用TE101模式、TE201模式、H型槽模下部实现三阶低通带，TE202模式、TE302模式、H-采用异形槽模式实现三阶上通带。所提出的单/双带滤波器的工作频率和带宽都可以独立控制。为了验证设计概念，设计、制造和测试了三阶单频和双频 HMSIW 带通滤波器 (BPF) 的两个原型。模拟结果和测量结果相互吻合。