设计了一种新型2.45GHz含螺旋传输线结构的准椭圆LTCC低通滤波器,给出了带外传输有限零点的解析公式.针对实际结构中的螺旋传输线的寄生耦合效应,修正了该滤波器的等效电路,使仿真等效电路得到的散射参数曲线与测量结果相互吻合.测量结果表明,该低通滤波器性能良好,达到了指标要求. A new quasi-elliptic LTCC low-pass filter with helical transmission line structure is designed and a analytical formula of the finite zero point of out-of-band transmission is given. In view of the parasitic coupling effect of the helical transmission line in the actual structure, The equivalent circuit makes the curve of the scattering parameters obtained by the simulation equivalent circuit agree with the measured result.The measurement results show that the low-pass filter has good performance and meets the index requirements.