一种覆盖Ku波段平衡式低噪声放大器的设计  

Design of Ku-band Balanced LNA

作　　者：朱明[1] 刘濮鲲[2] 王自成[2] 朱德才[1] 

机构地区：[1]中国科学院研究生院,北京100190 [2]中国科学院电子学研究所,北京100190

出　　处：《科学技术与工程》2008年第16期4476-4480,共5页Science Technology and Engineering

摘　　要：采用HMIC技术,设计出了覆盖Ku波段的微带型平衡式低噪声放大器,其全频段NF<2,增益为(10±1)dB,输入输出VSWR<1.43。其中,耦合电桥采用了改进型的3dB Wilkinson耦合器,比传统电桥具有更宽的带宽,且更易实现。匹配网络采用宽带直接优化法,实现了良好的增益平坦度。整个电路结构紧凑,分离元件少,易加工,成本低,具有很大的工程价值。By applying the technique of HMIC,one kind of balanced LNA covering the whole Ku-Band is designed.It is characteristic of NF〈2,G=（10±1）dB,and VSWR〈1.43 for both ports.In the framework of this LNA,two improved 3-dB Wilkinson couplers are used as signal splitter and combiner,which have broader bandwidth than traditional coupler,and are realized easier.Technique of direct optimization for broadband is adopted in matching network,which supplies good gain fluctuation characteristics.Compact structure,low cost,few lumped elements make this kind of LNA high practical value.

关 键 词：低噪声放大器 宽带匹配 Wilkinson耦合 

分 类 号：TN722.3[电子电信—电路与系统]