一种非对称新型微带耦合器的研究

Study on A New Unsymmetric Microstrip Coupler

本文介绍一种带有叉指的微带耦合器，它是一种非对称型的耦合器，耦合度由主传输线对的间距决定。使用叉指有效地提高了定向性，且缩短了耦合器的长度（耦合区约为八分之一波长）。文章分析了该种耦合器，推出了计算该种耦合器的一系列公式，并编制程序完成电路的计算，给出了22dB耦合器的实例。

A kind of microstrip coupler with fingers is introduced. It is an unsymmetric coupler and its coupling coefficient is determined by the space between main transmission lines. The directivity is improved and the length of coupler is shortened by using fingers. In this paper, the realization method is given, the formulas of the coupler are derived, and the design is completed by using computer program. The 22dB coupler is given as an example.