The high-order modes of the periodic-stub-loaded stripline are studied by using an equivalent circuit, which shows a good accuracy and efficiency. Due to the similarity, the proposed structure is compared with the spoof surface plasmon transmission line developed in recent years, and it reveals advantages for electromagnetic compatibility. Two approaches are introduced to suppress different transmission modes of the proposed structure. The first is the gradual transition structure, which could suppress higher order modes to form a low-pass (dc—9.2 GHz) filter. The second is the half-mode structure. It could suppress the fundamental and the second higher order modes to constitute a bandpass (9.6–27.6 GHz) filter. Both filters have selective transmission modes, broad stop band, steep transition and low-loss features. The prototypes are fabricated and measured. The measured filtering performance agrees well with the simulation data. Benefitting from aforementioned advantages, the proposed filters will be effective alternatives in practical high-speed integrated circuit.

中文翻译：

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宽带滤波器设计中周期性短截线加载带状线的高阶模式建模和分析

采用等效电路研究了周期短截线加载带状线的高阶模态，具有良好的精度和效率。由于相似性，将所提出的结构与近年来开发的欺骗表面等离子体传输线进行了比较，它揭示了电磁兼容性的优势。引入了两种方法来抑制所提出结构的不同传输模式。第一种是渐变过渡结构，可以抑制高阶模式以形成低通（dc-9.2 GHz）滤波器。二是半模结构。它可以抑制基波和二阶高阶模式以构成带通（9.6-27.6 GHz）滤波器。两种滤波器都具有选择性传输模式、宽阻带、陡峭过渡和低损耗特性。原型被制造和测量。测得的滤波性能与仿真数据吻合良好。受益于上述优点，所提出的滤波器将成为实际高速集成电路中的有效替代品。