直角耦合结构的宽阻带SIW滤波器  

Wide Stopband SIW Filter with Right-Angle Coupling Structure

作　　者：任龙[1,2] 孟令琴[1,2] 祝君豪[1] 周景超[1] 刘洁[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200072 [2]东南大学毫米波国家重点实验室,南京210096

出　　处：《上海大学学报（自然科学版）》2014年第4期466-471,共6页Journal of Shanghai University:Natural Science Edition

基　　金：上海市重点学科建设资助项目(S30108);上海市科委重点实验室资助项目(08DZ2231100);毫米波国家重点实验室开放课题经费资助项目(K201324)

摘　　要：提出一种新型的宽阻带基片集成波导（substrate integrated waveguide,SIW）滤波器.该滤波器采用直角耦合结构,在上阻带产生两个传输零点（transmission zeros,TZs）,分别位于两个不同的二次模（TE102/TE201）谐振频率附近.为了进一步提高滤波器的阻带特性,在SIW的上层金属面蚀刻两个矩形槽.测量结果表明,该滤波器中心频率10 GHz处的插入损耗为1.9 dB,通带内回波损耗大于20 dB.阻带抑制大于20 dB的频段为10.5~18.8 GHz,有效抑制了二次谐波响应.相比传统SIW带通滤波器,阻带宽度增加了48%.实测结果与仿真结果吻合良好.A wide stopband filter based on substrate integrated waveguide （SIW） is proposed. Using a right-angle coupling structure, the filter has two transmission zeros （TZs） in the upper stopband. These TZs are located near the resonant frequencies of the two different second-order modes （TE102/TE201）, respectively. To further improve the stop- band performance, two rectangular slots are etched on the top metal layer of the SIW. The insertion loss is approximately 1.9 dB at the center frequency of 10 GHz. The return loss in the passband is more than 20 dB. The stopband attenuation within 10.5,-18.8 GHz is better than 20 dB, and the second harmonic response is effectively inhibited. Compared with the traditional bandpass filter based on SIW, the stopband bandwidth of this filter is widened by 48%. Measured results well agree with numerical simulations.

关 键 词：带通滤波器 宽阻带 基片集成波导 传输零点 直角耦合 

分 类 号：TN713[电子电信—电路与系统]