C波段下变频器的设计与实现  

The Design and Realization of LNB in C-band

作　　者：黄阳镇 耿军平[1] 金荣洪[1] 梁仙灵[1] 朱晓伟[1] 

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《中国电子科学研究院学报》2014年第6期643-647,652,共6页Journal of China Academy of Electronics and Information Technology

基　　金：国家重大专项(2011ZX03001-007-03);国家自然科学基金(61201058);上海市教育委员会科研创新项目(12Z112030001);教育部留学回国人员科研启动基金;SMC-晨星优秀青年教师计划

摘　　要：下变频器是微波接收机的关键组件,其性能优劣将影响整个系统的指标。采用至上而下的模块化设计方法研制了一款C波段下变频器,首先进行下变频器的系统搭建和分立器件的指标分配,然后完成分立模块的原理设计、仿真优化和功能实现,最后实现系统集成和调试封装。该下变频器主要包括低噪声放大器、镜像抑制微带滤波器、锁相环本振源、混频器和功分器等元器件,体积小且便于集成,其射频输入为4.65±0.25 GHz,中频输出为1.3±0.25 GHz,测试噪声系数为4 d B,增益为1 d B,镜像频率和杂散信号抑制性能良好,各项指标满足系统要求。LNB is the key component of microwave receiver,which substantially affects the overall performance of the communication system. A modularized top-down design method is introduced to develop the LNB with high performance in C-band. Firstly,the system construction and the index distribution of discrete devices are completed based on the ADS software; Then the design,simulation and optimization are accomplished by the EDA simulation software and system integration and packaging can be realized finally. The proposed LNB with good performance and compact structure mainly consists of a LNA,a microstrip filter,a PLL frequency synthesizer,a mixer and a power divider. RF input frequency and IF output frequency of theproposed LNB is 4. 65 ± 0. 25 GHz and 1. 3 ± 0. 25 GHz respectively. According to the test result,the noise figure is 4 d B and the Gain is 1 d B,and a good performance of mirror frequency and spurious signal suppression can be achieved to match the communication system requirements.

关 键 词：下变频器 模块化设计 锁相环 噪声系数 

分 类 号：TN819.1[电子电信—信息与通信工程]