A high-isolation eight-way power combiner is proposed in this article that is constructed by cascading three stages of power combiners in series. Its high isolation and low return loss are realized by means of lumped isolators, an isolated side network, and a resistive septum. The eight-way power combiner is basically a 17-port mode network, consisting of eight input ports, eight matching ports, and one output port. The mode network matrix cascade computation clearly reveals the working mechanism. Based on the designed 17-port network, an eight-way power combiner is realized with eight matching ports connected to loads. The measurements agree well with the simulations. From 7.8 to 10.2 GHz, the return loss at the input ports is greater than 19 dB, the return loss at the output port is greater than 18 dB, the isolation is at least 19 dB, and the insertion loss is less than 0.4 dB. The proposed eight-way power combiner has the merits of high isolation, low return loss, low insertion loss, high power capacity, and ease of integration, with great potential for integration into high-power amplifiers.

中文翻译：

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一种高隔离八路功率合路器

本文提出了一种高隔离度的八路功率合路器，由三级功率合路器串联而成。它的高隔离度和低回波损耗是通过集总隔离器、隔离侧网络和电阻隔板实现的。八路功率合路器基本上是一个17端口模式的网络，由8个输入端口、8个匹配端口和1个输出端口组成。模式网络矩阵级联计算清楚地揭示了工作机制。基于所设计的17端口网络，实现了8路功率合路器，8个匹配端口连接负载。测量结果与模拟非常吻合。从 7.8 到 10.2 GHz，输入端口的回波损耗大于 19 dB，输出端口的回波损耗大于 18 dB，隔离度至少为 19 dB，插入损耗小于0.4dB。所提出的八路功率合路器具有高隔离度、低回波损耗、低插入损耗、高功率容量和易于集成等优点，具有很大的集成到大功率放大器中的潜力。