摘要
研究卫星天线射频信号优化问题,因镜频干扰在变频接收系统中影响很大,通常采用高品质的镜像抑制带通滤波器来处理高频信号。为了提高带通滤波器的镜像信号抑制能力和减小噪声系数,进一步减小多种干扰,提出微带带通滤波器设计方法和ADS软件优化设计高镜像抑制方法。方法通过对传输零点的准确定位,可实现选择性地抑制镜像信号。理论分析和仿真结果表明,所设计的带通滤波器性能和理论值一致,具有高镜像抑制能力、噪声系数低,同时还可以满足带内插损和带外抑制的设计要求,对工程应用有一定的指导意义。
The disturbance of image frequency sways badly in the frequency conversion system.Usually,the radio frequency image-reject filter with high quality is chosen to process the high-frequency signal.To overcome the shortcomings of existing microwave bandpass filter with low image rejection and noise factor,a new method using the software ADS is presented in this paper.Based on the accurate positioning of transmission zero,undesired image signal and noise factor are imitated over-45 dB and under 2 dB respectively.And a miniaturized microwave bandpass filter which has the least devices is designed by the new method.The simulation results show that the high image-reject bandpass filter is in accordance with the theoretic analysis,and the provided design method is very simple,convenient and suitable for the engineering design.
出处
《计算机仿真》
CSCD
北大核心
2011年第4期71-73,91,共4页
Computer Simulation
关键词
带通滤波器
镜像抑制
传输零点
Bandpass filter
Image-reject
Transmission zero
