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《Electronic Components and Materials》 2018-05
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Design of quasi-elliptic microstrip bandpass filter based on SIR

LIU Kaizheng;LIU Shiqin;XIANG Tianyu;ZHENG Xiaoyuan;LEI Tao;School of Mechanical and Electrical Engineering, Guizhou Normal University;Mechanical and Electrical Engineering Faculty, Jian College;  
A microstrip bandpass filter with quasi-elliptic function response based on SIR was proposed for the first time.With two opened half-wavelength SIRs side-coupled to I/O feed lines,the realized filter response possesses two transmission zeros in stopband which improve the stopband rejection,first spurious rejection and selectivity,but the circuit size is almost not increased.The effective overall circuit only occupies 16 mm×3.32 mm,about 0.45λ_g×0.093λ_g,whereλ_g is the guided wavelength at the passband centre frequency.The simulated and measured results show that the bandstop filter has a centre frequency of 4.95 GHz.The minimum insertion loss is 1.6 d B.The two transmission zeros are located at 2.34 GHz and 6.3 GHz.The stopband rejections are better than 40 d B and 35 d B near the lower stopband and upper stopband,respectively.The first spurious rejection is better than 25 d B.The bandwidth of upper stopband better than 20 d B is 9 GHz.
【Fund】: 贵州省科学技术基金计划项目(黔科合基础[2016]1108);; 贵州省科学技术基金项目(黔科合LH字[2014]7048)
【CateGory Index】: TN713
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