This paper presents a novel slow wave structure (SWS) using geometrically progressive loaded shunt stubs for miniaturization of microstrip lines. It is observed that, compared to the conventional periodically stub loaded SWS, the proposed technique renders further miniaturization of around 20%, theoretically. Apart from that, this technique also helps in suppression of higher pass bands inherently present in SWSs. A detailed analysis of this technique has been carried out with corresponding design scheme. For proof of concept, this miniaturization scheme is applied to a rat‐race coupler designed at 2 GHz, where 75% reduction in overall footprint is observed. The simulated and measured results are found to be in good agreement with the proposed theory.

中文翻译：

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用于基于传输线的组件小型化的几何渐进存根加载方案

本文提出了一种新颖的慢波结构（SWS），该结构使用几何渐进式负载短截线来微带线的小型化。可以观察到，与常规的定期存根加载的SWS相比，所提出的技术在理论上实现了约20％的进一步小型化。除此之外，该技术还有助于抑制SWS中固有的更高通带。已经用相应的设计方案对该技术进行了详细的分析。为了进行概念验证，此小型化方案适用于设计为2 GHz的鼠形耦合器，在该耦合器中，总体占地面积减小了75％。仿真和测量结果与所提出的理论非常吻合。