设计射频大功率放大器时，为了传输大的电源电流而加宽的λ/4电源偏置微带线往往不能很好的对偏置电路和信号电路进行隔离，从而影响放大器的性能。本文对一种采用加厚微带线设计λ/4电源偏置电路的方法进行了分析，并根据一种卫星数传发射机的功率放大器设计要求，分别采用本文介绍的方法和传统方法设计了两个功率放大器，给出了分析和试验结果，结果表明加厚λ/4偏置微带线可以比传统方法令功率放大器获得更高的性能，具有较大参考意义。

When conducting design of RF high power amplifier (HPA), the broadened microstrip λ/4 bias line for high DC current decreases the performance of the HPA. In this article, a thickened microstrip line is proposed to design the λ/4 drain bias circuit for HPA and is applied to a power amplifier for a miniaturized satellite transmitter. Measurement results showed that thickened bias line is feasible and useful for increasing HPA’s performance.