针对目前北斗通信系统中设计临频干扰和传统滤波器存在的工作频率、带宽、带内平坦度和矩形系数等指标不理想的缺陷,设计了一种新式滤波器模型.该模型具有较好的矩形系数、带内平坦度和带外抑制能力,-3 dB带宽内波动小于0．896 dB,实测矩形系数为1．73,能够很好去除北斗通信系统模拟中频中的干扰信号.利用ADS2008仿真软件进行了模型的仿真,制作实物测试滤波器的矩形系数、带内平坦度及带外抑制能力.结果表明,该滤波器可用于北斗通信系统.%A new filter model was presented to address the problems of adjacent frequency interference in the Beidou satellite communication system and poor performance in working frequency, bandwidth, pass band flatness and rectangular coefficient of the traditional filter. It has good performance on rectangular coefficient, pass band flatness and rejection of out bandwidth, the -3 dB bandwidth was less than 0. 896 dB, and the measured rectangle coefficient was 1. 73 , which can filter the interference signal in the medium frequency in Beidou communication system. The software ADS2008 was used for simulation and design of the model, including test of rectangular coefficient, pass band flatness and out band rejection. It is proved that the new filter can be well used in the Beidou communication system.
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