针对微波系统对定向耦合器带宽要求高的问题,提出了一种宽带定向耦合器的设计方法。将多节耦合传输线等效为多节阶梯阻抗滤波器的级联,采用矩阵运算和网络综合理论设计了一款1~4 GHz耦合度为20 dB的定向耦合器,并采用加载枝节补偿电容的方法提高耦合器的定向性。通过HFSS仿真软件对其进行仿真优化,并制造了一款宽带定向耦合器实物,实测结果表明：在1~4 GHz内该耦合器的耦合度在-19.3~-20.2 dB之间,隔离度小于-30 dB,回波损耗小于-13 dB,带内波动小于0.9 dB,达到-20 dB耦合器设计要求。
Abstract
In order to solve the problem that microwave system needed the wider bandwidth of directional coupler, a new method of wide-band directional coupler was proposed. A 1 ~ 4 GHz directional coupler with a coupling degree of 20 dB was designed, and the directivity of coupler was improved by loading branch compensation capacitance. HFSS simulation software was used to optimize the coupler. The test results show that the coupling degree of the coupler is between -19.3 ~ -20.2 dB in 1~4 GHz, the isolation degree is less than -30 dB, the return loss is less than -13 dB, and the in-band fluctuation is less than 0.9 dB, meeting the design requirements of the -20 dB coupler.
关键词
带状线耦合器 /
宽带 /
补偿电容 /
高定向性 /
矩阵运算
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Key words
strip line coupler /
broadband /
compensation capacitance /
high orientation /
matrix operations
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中图分类号：
TP713
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参考文献
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脚注
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基金
* 上海市科委基金资助项目(17ZR1411100)
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