三模混合集成小型化滤波器设计

A triple-mode bandpass filter featured with hybrid integration and tiny size

提出了一种基于LC串联单元的三模混合集成小型化滤波器电路拓扑。该电路拓扑具有对称性,主体由4个LC串联单元所构成的“星型”结构组成,能够通过对其并联于地的LC串联单元中元件参数的调节实现对滤波器双零点的自由调节。基于奇偶模分析方法,给出了所提出滤波器拓扑的综合设计方法,并采用基于商业化硅基表贴电容的低成本混合集成技术研制一款具有明显小型化特性的三模多零点带通滤波器。所研制的滤波器仿真与测试结果吻合良好,其中心频率为2.6 GHz,3 dB带宽为1.34 GHz,插入损耗典型值为1.6 dB,能够在4~12 GHz的频带范围内实现30 dB的抑制能力,其面积尺寸为3.2 mm×1.9 mm(0.03λ0×0.02λ0)。

A circuit topology of a LC series unit based triple-mode bandpass filter featured with hybrid integration and tiny siaze is proposed.The main part of the symmetrical circuit is composed of a“star”structure with four LC series units.It can realize the free adjustment of the two transmission zeroes by adjusting the parameters of the LC series units connected in parallel to the ground.Based on odd-even mode analysis method,this paper presents the comprehensive design method of the proposed filter and develops a triple-mode multiple-zero bandpass filter with miniaturization characteristics by using hybrid integration technology with commercial silicon-based surface mount capacitors.The simulation and test results of the developed filter are in good agreement.The filter has a 3 dB bandwidth of 1.34 GHz at center frequency of 2.6 GHz.The typical insertion loss of the filter is 1.6 dB.The upper stopband attenuation higher than 30 dB is 4~12 GHz.It occupies only 3.2 mm×1.9 mm(0.03λ0×0.02λ0).