Mode Analyzing Method for Fast Design of Branch Waveguide Coupler
Mode Analyzing Method for Fast Design of Branch Waveguide Coupler
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DOI：
10.1109/tmtt.2019.2944598
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发表时间：
2019-10
影响因子：
4.3
通讯作者：
Zhongqian Niu;Daotong Li;Bo Zhang;Ke Yang;Yilin Yang;D. Ji;Yang Liu;Yinian Feng;Yong Fan;Xiao-dong Chen
中科院分区：
文献类型：
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作者：
Zhongqian Niu;Daotong Li;Bo Zhang;Ke Yang;Yilin Yang;D. Ji;Yang Liu;Yinian Feng;Yong Fan;Xiao-dong Chen
提出了一种精确、有效的分析对称四端口分支波导耦合器耦合比的方法。该方法是基于模式匹配法（MMM）和奇，偶模分析，考虑结和不连续性的基模和高阶模之间的相互作用。结果表明，在中心频率一定的情况下，波导耦合器的耦合比取决于所有分支线的高度之和，这对任意耦合比和任意分支数（≥3）的波导耦合器都适用。相对于传统设计方法的复杂性和仅在某些限制条件下有效性，该方法具有精确性和通用性的特点，并且具有简单直观的表达形式。通过表征具有不同数量的分路分支的四个制造的波导耦合器，在实验中验证了理论工作。
An accurate and efficient method for analyzing the coupling ratio of symmetrical four-port branch waveguide coupler is presented. The method is based on the mode-matching method (MMM) and the odd and even mode analysis, considering the interactions between the fundamental and higher order modes in junctions and discontinuities. It is found that the coupling ratio of the waveguide coupler is depended on the sum of all the branch line height if the center frequency is determined, which is valid for any coupling ratio and any number of shunt branches (≥3) waveguide coupler. Compared to the traditional design method that is complex and only valid under some restrictions, the proposed method has the characteristics of accuracy and universality, and has a simple and intuitive expression. The theoretical work is verified in an experiment by characterizing four fabricated waveguide couplers with a different number of shunt branches.