应用于WLAN的加载对称H型枝节的双通带滤波器

Design of a Novel Dual-Band Bandpass Filter Loaded Symmetrical H-Shaped Stubs for WLAN Application

提出了一种新型的可直接应用于无线通信WLAN的双通带微带滤波器。该滤波器通过在开环阶梯阻抗谐振器(SIR)上加载对称H型枝节的方式,实现其良好的双通带特性。对滤波器结构进行加工与实测,实测结果与仿真结果吻合良好。实测结果表明,该滤波器两个通带的中心频率分别位于2.4GHz和5.2GHz,满足WLAN(IEEE-802.11a/b/g)的应用需求。最后加工得到的滤波器尺寸为33.06mm×13.23mm,相对尺寸为0.26λg×0.10λg,具有小型化的特点。

In this paper,a novel dual-band bandpass filter applied for WLAN application is proposed. The filter structure used open-loop stepped impedance resonators( SIRs) loaded symmetrical H-shaped stubs to achieve its good dualband response. The filter structure has been fabricated and measured,the measurement performance showed good agreements with the simulation. And results showed that the filter had two passbands centered at 2. 4GHz and 5. 2GHz,which is agreeable with WLAN( IEEE-802. 11 a / b / g) application. And the final filter's size is 33. 06 mm × 13. 23 mm,which corresponds to a size of 0. 26 λg× 0. 10λg,where λgis the guided wavelength at the centre frequency of the first passband,so that the filter has the characteristics of miniaturization.