小型化宽阻带微带带通滤波器的设计

小型化宽阻带微带带通滤波器的设计

内容简介：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个传输零点，使阻带抑制在3.95~13.27 GHz小于-20 dB，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12.2 mm×11.5 mm，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。

Abstract：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.

作者：胡昌海, 熊祥正, 吴彦良,

关键词：阶跃阻抗谐振器, 交叉耦合, 小型化, 宽阻带