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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.
A new type of planar microstrip dual-band bandpass filter is proposed, which consists of an open-loop ladder impedance resonator loaded with double branch lines and a parallel coupled microstrip line.By adjusting the open-loop ladder impedance resonator, parallel coupling microstrip line and The length of the branch line is loaded, and the bandpass filter has good dual-pass characteristics at 2.55 and 5.35 GHz with good isolation between them, with the relative bandwidths of 11.8% and 16.8% respectively. The bandpass filter has a wider bandwidth at band 2 than the ring ladder impedance resonator and can cover the entire range of WLANs in the high frequency band. The dual band bandpass filter has low loss, high isolation, low ripple By comparing the simulation results of HFSS software with the actual measured results, we found that the two have good consistency.