This article presents the design of a broadband high‐efficiency power amplifier (PA) with a compact coupling structure. In theory, the output matching network impedance expression based on the compact coupling structure is derived. According to the load impedance range of the class EFJ PA, the coupling structure is deduced to meet the impedance range of the class EFJ PA. This structure can realize the two functions of impedance transformation and harmonic impedance control. In order to further expand the bandwidth and improve the drain efficiency, the step impedance matching method is used to design the input matching network. To verify this design approach, a broadband high‐efficiency PA over a 115% bandwidth from 0.8 to 3.0 GHz is designed. The measured results show that the PA delivers output power of 40–42.2 dBm with the drain efficiency of 62%–73% and gain of 10–12.2 dB in the target band. The test results are good consistent with the simulated ones.

中文翻译：

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具有紧凑耦合匹配网络的宽带高效功率放大器

本文介绍了具有紧凑耦合结构的宽带高效功率放大器（PA）的设计。从理论上推导基于紧凑耦合结构的输出匹配网络阻抗表达式。根据EFJ PA类的负载阻抗范围，推导出耦合结构以满足EFJ PA类的阻抗范围。这种结构可以实现阻抗变换和谐波阻抗控制的两个功能。为了进一步扩展带宽并提高漏极效率，采用阶跃阻抗匹配方法来设计输入匹配网络。为了验证这种设计方法，设计了从0.8到3.0 GHz的115％带宽的宽带高效功率放大器。测量结果表明，PA可以提供40–42的输出功率。在目标频段内，其2 dBm的漏极效率为62％–73％，增益为10–12.2 dB。测试结果与模拟结果吻合良好。