基于级联平行阶跃耦合线开路贴片的镜频抑制预选器分析与设计  

Analysis and design of an image rejection preselector with open patch loaded parallel coupled line

作　　者：姜杨 鞠丽娟 张智翀 JIANG Yang;JU Li-juan;ZHANG Zhi-chong(Tongfang Electronic Technology Co,Ltd,Jiujiang 332002,China;College of Information Engineering,Jiujiang Vocational and Technical College,Jiujiang 332007,China;College of Electronic and Information Engieering,Jinggangshan University,Ji’an 343009,China)

机构地区：[1]同方电子科技有限公司,江西九江332002 [2]九江职业技术学院信息工程学院,江西九江332007 [3]井冈山大学电子与信息工程学院,江西吉安343009

出　　处：《磁性材料及器件》2020年第6期49-52,57,共5页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(61701205);江西省教育厅科技计划基金资助项目(GJJ160752)。

摘　　要：为提高超外差接收机对镜频的抗干扰能力,提出了一种新的基于级联平行阶跃耦合线的开路贴片的镜频抑制预选器,可在超外差接收机的输入端滤除外来的镜频干扰信号,以保证接收机可接收到正常的通信信号。并讨论了基于级联平行阶跃耦合线的开路贴片的结构模型,进一步建立等效电路模型对其进行定量分析,研究了传输零点与电长度的关系以及慢波因子对阻带谐波的抑制。实测结果表明,该电路使得预选器的矩形系数达到了1.08。在3.72 GHz处设计了一个传输零点且可通过独立调控电路参数实现零点可调,阻带抑制远大于100 dBc。实测结果和理论分析一致,证明了该结构的可行性,可在小型化镜频抑制预选器中得到很好的应用。In order to improve the image rejection of the superheterodyne receiver,a new image rejection preselector with patch loaded parallel coupled line is proposed to filtering the image interference signal to ensure the normal communication signals.Based on the structure,an equivalent circuit model is proposed for quantitative analysis,and dependence of transmission zeros on electrical length and suppression of stopband harmonics by slow-wave ratio.The rectangular coefficient is 1.08.There is a transmission zeros at 3.72 GHz,which can be independently tuned.The measured results demonstrate agreement with theory,verifying the feasibility of the structure,and it can be well applied in the design of the preselector.

关 键 词：镜频抑制预选器 平行阶跃耦合线 开路贴片 传输零点 矩形系数 镜频干扰 慢波因子 

分 类 号：TN713[电子电信—电路与系统]