高性能电容加载LTCC带通滤波器的研究  

Research of high-performance capacitor-loaded LTCC bandpass filter

作　　者：乔冬春[1] 戴永胜[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《电子元件与材料》2015年第12期68-71,共4页Electronic Components And Materials

基　　金：国家重点基础研究发展"973"计划项目资助(No.2009CB320201);国家国防重点实验室基金项目资助(No.9140C1402021102)

摘　　要：提出一种基于LTCC技术的高性能电容加载带通滤波器的实现方法。通过在带状线两端加载电容,从而实现谐振单元的小型化。同时通过交叉耦合,在通带两端引入两个零点,实现了陡峭的边带衰减,大大提高了滤波器的带外衰减抑制,之后借助电磁场三维仿真软件HFSS对模型进行优化。实际测试结果与仿真结果吻合较好,中心频率为4.75 GHz,带宽为500 MHz,在2.6 GHz至4.1 GHz频带以及5.4 GHz至6.9 GHz频带上的衰减均优于35d B,尺寸仅为3.2 mm×2.5 mm×1.5 mm。A new method of realizing high-performance capacitor-loaded bandpass filter based on LTCC technology was proposed. By loading capacitance at both ends of the strip line, the resonator achieved miniaturization. At the same time, through the cross coupling, two transmission zeros were introduced to realize the steep attenuation of the side-band, which also greatly improved the stopband attenuation of the filter. Then the model was optimized by the 3D simulation software HFSS. The measured results match well with the simulation results. The center frequency is 4.75 GHz with the bandwidth of 500 MHz, the stopband attenuation is better than 35 dB from 2.6 GHz to 4.1 GHz and 5.4 GHz to 6.9 GHz, size is only 3.2 mm×2.5 mm×1.5 mm.

关 键 词：带通滤波器 电容加载 传输零点 LTCC 带状线 高阻带抑制 

分 类 号：TN713[电子电信—电路与系统]