Compact dual-band bandpass filter for WLAN systems  

用于无线局域网的小型化双频段带通滤波器(英文)

作　　者：朱晨[1] 周健义[1] 

机构地区：[1]东南大学毫米波国家重点实验室,南京210096

出　　处：《Journal of Southeast University(English Edition)》2010年第4期509-512,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.60621002,60702027,60921063);the National Basic Research Program of China(973Program)(No.2010CB327400);the National High Technology Research and Development Program of China(863Program)(No.2008ZX03005-001,2008AA01Z223,2009AA011503)

摘　　要：A novel dual-band planar microstrip filter using parallel coupled microstrip lines and open-loop stepped-impedance resonators（SIRs）loaded with two shunt open stubs is presented.By tuning the physical lengths of open-loop SIRs,parallel coupled microstrip lines and two stubs,the bandpass filter has good dual-passband performance at 2.55 and 5.35 GHz and high isolation between the two passbands.The relative bandwidths of the two passbands are 11.8% and 16.8%,respectively.Compared with the conventional open-loop SIR filters,the designed filter has a comparatively broader fractional bandwidth at the second passband.So it can cover all the wireless LAN（local area network）bands.In addition,the filter has the features of low loss,high rejection and low ripple.The measured results are in good agreement with the simulated responses by HFSS software.提出了一个新型的平面微带双频段带通滤波器,由加载双分支线的开环阶梯阻抗谐振器和平行耦合微带线组成.通过调节开环阶梯阻抗谐振器、平行耦合微带线和加载分支线的长度,带通滤波器在2.55与5.35GHz具有很好的双通带特性且在其间有很好的隔离度.两者的相对带宽分别为11.8%与16.8%.与传统的开环阶梯阻抗谐振器相比,该带通滤波器在第2频带有更宽的带宽,可以覆盖WLAN在高频段的整个范围.该双频段带通滤波器具有低损耗、高隔离、低纹波的特性.通过比较HFSS软件的仿真结果与实际测得的结果发现,两者具有很好的一致性.

关 键 词：DUAL-BAND parallel coupled microstrip lines stepped-impedance-resonators（SIRs） 

分 类 号：TN713.5[电子电信—电路与系统]