This letter reports on the RF design and practical development of miniaturized substrate-integrated-(SI)-coaxial-resonator-based bandstop filters (BSFs). Size compactness is achieved through the use of double-resonant coaxial resonators that are shaped by two coupled capacitively loaded posts within the volume of a circular cavity. The operating principles of the double-resonant SI-coaxial-resonator-based BSF concept are demonstrated by means of coupled-resonator diagrams and synthesized examples of both single-stage and multi-stage higher order BSF configurations. For proof-of-concept validation, various single- and two-stage coaxial-resonator-based BSF prototypes were designed, manufactured, and measured at $S$ -band.

中文翻译：

---

使用双谐振同轴谐振器的紧凑型基板集成带阻滤波器

这封信报告了基于小型化基板集成 (SI) 同轴谐振器的带阻滤波器 (BSF) 的 RF 设计和实际开发。尺寸紧凑是通过使用双谐振同轴谐振器实现的，该谐振器由圆形腔体体积内的两个耦合电容负载柱形成。通过耦合谐振器图和单级和多级高阶 BSF 配置的合成示例，演示了基于双谐振 SI 同轴谐振器的 BSF 概念的工作原理。为了概念验证验证，设计、制造和测量了各种基于单级和两级同轴谐振器的 BSF 原型，并在 $S$ 波段进行测量。