宽带小型化微带均衡器设计

Design of Broadband Miniaturized Microstrip Equalizer

功率放大模块在工作频带内存在增益波动的情况,目前较为理想的解决方案是在原传输网络中添加一个增益均衡网络,该均衡网络就是增益均衡器。文章针对2~6 GHz功放模块增益波动较大的问题,设计和制造了一种采用微带电路的小型化均衡器,其工作频率为2~6 GHz,均衡量约为9 dB,输入输出驻波系数小于1.5,改善了功放模块输出功率不平坦的问题,对研发该类均衡器有一定的参考价值。文中简要介绍了传输线和增益均衡器的基本原理以及薄膜电路的相关设计,结合实际需求,确定目标曲线,设计增益均衡器的初始模型,再利用三维场仿真软件对增益均衡器进行仿真优化,研制出2~6 GHz微带型增益均衡器。该增益均衡器实测结果与设计基本吻合,满足了小型化的设计要求。

The power amplifier module has gain fluctuation in the working frequency band.The ideal solution to this problem,at present,is to add a gain equalizer network to the original transmission network,which is called gain equalizer.In this paper,a miniaturized equalizer using microstrip circuit is designed and manufactured,aiming at the problem that the gain of 2-6 GHz power amplifier module fluctuates greatly.Its working frequency is 2-6 GHz,the balance is about 9 dB,and the input and output standing wave coefficient is less than 1.5,which improves the problem of uneven output power of power amplifier module,and has certain reference value for the research and development of this kind of equalizer.Furthermore,the basic principle of transmission line and gain equalizer and the related design of thin-film circuit are briefly introduced in the paper.According to the actual demand,the target curve is determined,the initial model of gain equalizer is designed.Then the gain equalizer is simulated and optimized by three-dimensional field simulation software,and the 2-6 GHz microstrip gain equalizer is developed.The experimental results of the gain equalizer are in good agreement with the design and meet the design requirements of miniaturization.