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设计了一款新型的小型化双频分支线耦合器。通过在端口处加载一段扩展的传输线实现分支线耦合器的双频工作。使用微带过渡结构连接不同介质层中的两个微带线电路以降低耦合器的尺寸。利用传输线理论将传统的λ/4传输线等效为T型传输线结构,并将端口处的扩展部分进行折叠处理,达到进一步缩减器件尺寸的目的。本文设计了一个工作频率在0.97/1.8GHz的双频分支线耦合器,并进行实物加工,仿真结果性能良好,实测与仿真数据非常吻合。
Designed a new miniaturized dual-frequency branch-line coupler. The dual-band operation of the branch line coupler is implemented by loading an extended transmission line at the port. Use microstrip transitions to connect two microstrip circuits in different media layers to reduce the size of the coupler. Using the transmission line theory, the traditional λ / 4 transmission line is equivalent to the T transmission line structure, and the expansion part at the port is folded to achieve the purpose of further reducing the size of the device. In this paper, we design a dual-frequency branch-line coupler operating at 0.97 / 1.8GHz and perform in-kind processing. The simulation results show good performance, and the measured and simulated data are in good agreement.