新型宽带差分带通滤波器

Novel Wideband Differential Bandpass Filter

基于信号干扰理论,提出了两种新型的滤波器拓扑结构。两滤波器分别通过加载开路短截线构成T型分支线结构和加载短路枝节来改善共模抑制特性。两滤波器结构都具有良好的差模通带选择特性及其共模抑制特性。实验结果表明:两滤波器差模通带中心频率f_0分别为7.05GHz和6.00GHz,3dB相对带宽分别为81%和65%,共模抑制衰减都在-16.8dB以上。

Two different filters based on signal interference technology were proposed. By loading open-circuit truncated lines to form T-type branch line and loading short-circuit branch, the two filters improved the common mode suppression characteristics, respectively. Both of the proposed filters have good selectivity for the differential mode passband selection and harmonic suppression for the common mode. The experimental results show that the center frequency f0 of the two filters are 7.05 GHz and 6.00 GHz, respectively, and the prototype （mm） with 3 dB fractional bandwidth are 81% and 65%, and insertion loss greater than 16.8 dB for common mode of the two filters.