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在固态毫米波功率放大器设计中,单片MMIC输出功率较小,提高系统功率的有效方法是采用功率合成技术,目前的功率合成技术存在的设计难点是提高各分配支路间的隔离度。本文基于对传统魔T的分析和改进,提出了一种高隔离度的3dB功率分配结构。经实验测试,运用该结构设计的功率分配器,在29.3-39.3GHz的频带内两等分支路之间的隔离度可高达-42dB,两支路的不平衡度低于0.1dB,插入损耗优于-0.25dB,很好地满足了实际应用的要求。
In the design of solid-state millimeter-wave power amplifier, the output power of monolithic MMIC is small, and an effective way to increase the system power is to use the power synthesis technology. The current design difficulty of power synthesis technology is to improve the isolation between the distribution branches. Based on the analysis and improvement of the traditional magic T, this paper proposes a high isolation 3dB power distribution structure. The experimental test, the use of the structure of the power splitter design, in the band 29.3-39.3GHz two equal branches between the isolation of up to -42dB, the two branches of unbalance less than 0.1dB, excellent insertion loss -0.25dB, well meet the practical application requirements.