Ka波段微带下变频器

下变频器简称高频头,是卫星电视接收系统的一个重要组成部分,它可对卫星下行信号进行放大和变频.与传统的C波段和Ku波段下变频器相比,Ka波段下变频器具有许多优点,正逐步在通信领域中得到应用.文中介绍了一种用于卫星直播系统的Ka波段微带下变频器,首先说明了其电路的工作原理和结构,然后研究了内部各模块的设计方法和用微波器件构造具体电路的实现过程.调试实验和实际接收表明该Ka波段下变频器具有良好的性能和较大的实用价值.

A Ka-band Microstrip Low Noise Downconverter

LNB(low noise downconverter block) is called RF head for short.It is an important part of satellite-television receiving system.It can amplify and convert satellite down-signals.In comparison with traditional C-band LNB and Ku-band LNB,Ka-band LNB has a lot of advantages,and is being used gradually in communication fields.This paper introduces a kind of Ka-band microstrip LNB for direct broadcast satellite(DBS).It firstly explains the circuit operation principle and the structure of Ka-band LNB,then studies the design methods of its internal modules and the realization process of the specific circuit made up of microwave components.Debugging experiments and practical reception show that this kind of Ka-band LNB has good performance and big practical value.