一种分段无源预选滤波器的设计  

Design of the Menogenesis Passive Preselected Filter

作　　者：陈锟[1] 代兵[1] 朱正平[1] 蓝加平[1] 

机构地区：[1]中南民族大学电子信息工程学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2012年第1期75-79,共5页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金仪器专项资助项目(41127003);湖北省自然科学基金重点资助项目(2010CDA062);国家科技基础性专项重点资助项目(2008FY120100)

摘　　要：给出了一种分段无源预选滤波器的设计,以提高接收机对带外强干扰的抑制能力及信噪比、灵敏度等指标.该预选滤波器采用无源LC并联谐振实现滤波,微控制器控制衰减倍数来调节滤波器的输出幅度.将预选滤波器加入到扫频雷达中对电离层进行探测,实验结果表明:该滤波器提高了接收机的信噪比、灵敏度,对带外强干扰的抑制能力可达20 dB,改善了雷达的性能.The receiver＇s parameters such as the rejection capability of interference outside the band,the signal to noise ratio,and the sensitivity can be improved by using the merogenesis passive preselected filter in the front end of the receiver.The preselected filter is realized by parallel resonance passive LC circuits and its output magnitude is controlled by the microcontroller adjusting the attenuator coefficient.The experimental results show that the preselected filter improved the receiver＇s parameters of the signal to noise ratio and the sensitivity,had the ability to suppress strong interference of outside the band reached 20dB and promoted the performance of the radar.

关 键 词：短波无线电 扫频接收机 预选滤波器 

分 类 号：O453[理学—无线电物理]