基于巴特沃斯（最大平坦型）低通滤波器模型，研究了毫米波限幅器在小信号时的等效电路．结合限幅电路电磁场仿真模型，分析限幅二极管物理模型的寄生参数和键合金丝电感，提取相应的S参数，以设计限幅器的阻抗匹配网络，研制出了Ka波段全频段低插损限幅器．在26～40GHz ，测得限幅器小信号插损小于4.3dB ，最小插损2.2dB ，驻波比小于1.95∶1；当输入的连续波功率为0.5W时，限幅输出功率小于10.5dBm；整个限幅器尺寸为20×12×6mm3，限幅器性能达到国外同类产品水平．%Equivalent circuit of a millimeter wave limiter is analyzed based on Butterworth (maximally flatness ) low pass filter model .Considering the parasitic components of the limiter diodes ,the whole limiter physical structure is setup .Diode parasitic parameters ,bonding wire inductances ,and complete limiter circuit matching networks are analyzed with EM software .A Ka full-band low insertion loss limiter is realized ,the measured small-signal insertion loss is lower than 4.3dB in 26~40GHz ,the lowest in-sertion loss is 2.2dB ,and the VSWR is better than 1.95∶1 .At large signal condition with input continuous wave power of 0.5W , the peak leakage power is lower than 10 .5dBm .The dimension of the limiter is 20 × 12 × 6mm3 ,and its performance achieves the level of similar foreign products .
展开▼
