小型化宽阻带微带带通滤波器的设计  

Design of a miniaturized wide stop-band micro-strip band-pass filter

作　　者：胡昌海[1] 熊祥正[1] 吴彦良[1] 

机构地区：[1]西南交通大学电磁场与微波技术研究所,四川成都610031

出　　处：《现代电子技术》2013年第19期80-82,共3页Modern Electronics Technique

摘　　要：提出一种小型化宽阻带微带带通滤波器，采用半波长阶跃阻抗谐振器结构，且在不相邻的谐振器之间引入交叉耦合，从而在滤波器的阻带上产生了2个传榆零点，使阻带抑制在3．95-13．27GHz小于-20dB，使寄生通带在中心频率的3．92倍处。滤波器的最终尺寸仅为12．2mm×11．5mm，即0．21λg×0．2λg，相比于传统的发夹型滤波器，此滤波器的体积减小了63．5％，而且实测的结果与仿真结果达到了较好的一致性。所提出的滤波器具有更宽的带外抑制，更小的尺寸，且设计简单，在工程领域具有实际的应用价值。A miniaturized wide stop-band micro-strip band-pass filter is proposed, which uses the structure of half-wave- length stepped impedance resonator, and the cross-coupling structure is introduced into non-adjacent resonators to form two transmission zeros in the stopband which makes the stop-band rejection lower than -20 dB in the range of 3.95~13.27 GHz and the spurious passband at the frequency in 3.92 times of the centre frequency. The final size of the proposed filter is only 12.2 mm×11.5 mm, i.e., 0.21λg×0.2λg. Compared with the traditional hairpin filters, the proposed filter reduces the size of 63.5%. The measured results show good agreement with the simulated results. The proposed filter has wide out-of-band rejec- tion, smaller size, simple design and obvious practical value in the engineering field.

关 键 词：阶跃阻抗谐振器 交叉耦合 小型化 宽阻带 

分 类 号：TN713.534[电子电信—电路与系统]