摘要
为满足滤波器在双频带通信系统中的发展要求,提出了一种基于互补开口谐振环半模基片集成波导(CSRRHMSIW)加载互补开口谐振环缺陷接地(CSRR-DGS)的新型双带滤波器.根据CSRR-HMSIW和CSRR-DGS的传输特性,提出了一种CSRR-HMSIW和CSRR-DGS并联的双谐振结构,实现了一个双通带滤波器.利用精确设计CSRR-HMSIW的结构参数,确定其谐振频点和传输零点,实现以该谐振频点为中心的第一个通带;精确设计CSRR-DGS外边长和对应的开路支线长度、宽度,确定开路支线和CSRR-DGS彼此间的耦合产生谐振频点,实现以该谐振频点为中心的第二个通带,同时该结构引入一个传输零点,进一步加强第二通带高频段的带外抑制特性.设计和制作了一款工作于2.5GHz和5.4GHz的双带滤波器,测试两通带插入损耗小于2.4dB、两通带间的隔离高达55dB和带外抑制达到45dB,测试与模拟仿真结果吻合良好.
To meet the development requirements of the filter in the dual-band communication syst novel dual-band filter is presented, which is based on the half mode substrate integrated waveguide em （H , a M- SIW） loaded with the complementary split-ring resonator （CSRR） and the complementary split-ring re sonator defected ground structure （CSRR-DGS）. According to the transmission characteristics of CSRR- HMSIW and CSRR-DGS, a double resonance structure which parallels CSRR-HMSIW and CSRR-DGS is proposed to implement a dual-band filter. Owing to the structure parameters of CSRR-HMSIW, the reso- nant frequency point and transmission zero is determined, achieving the resonance frequency point as the center of the first passband. The out ring side length of CSRR-DGS and the length, width of the open stub is accurately designed to produce coupling resonance frequency point between the open stub and the CSRR- DGS, which is used to achieve its center point as a second passband, a transmission zero of the structure is introduced to further strengthen out-of-band rejection characteristic form the second passband with high frequency. A dual-band filter operating at 2.5 GHz and 5.4 GHz is designed and fabricated. Its measured insertion loss of the two passbands is less than 2.4 dB, and the isolation between two passbands is better than 55 dB, and the out-of-band rejection level is more than 40 dB. The measured results are in good agree- ment with the simulated ones.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第12期162-168,共7页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金资助项目(64101373)
中央高校基本业务费专项资助项目(XDJK2013B004
2362014xk13)
西南大学博士启动基金(SWU111030)
