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运用仿真软件Ansoft HFSS,构建了一款边带陡峭的LTCC带通滤波器的三维模型。在将滤波器级数增大到六级的基础上,又通过不相邻谐振级之间的交叉耦合,分别在阻带的高、低端引入了多个传输零点,大大提高了带外抑制度。结合电路仿真以及三维电磁场仿真,设计并制作了一款尺寸为4.5mm*3.4mm*1.5mm的六级带通滤波器,其中心频率为3.325GHz,带宽为170MHz,实测结果与仿真结果一致性较好。由于采用了目前流行的LTCC多层结构,该滤波器体积非常小,是标准的片式元器件封装,可以广泛应用于各移动通信系统中。
Using the Ansoft HFSS simulation software, a three-dimensional model of a steep LTCC band-pass filter is constructed. Based on increasing the number of filter stages to six stages and introducing cross-coupling between non-adjacent resonant stages, multiple transmission zeros are respectively introduced at the high and low end of the stop band, which greatly improves out-of-band suppression degree. Combined with the circuit simulation and three-dimensional electromagnetic field simulation, a six-stage band-pass filter with a size of 4.5mm * 3.4mm * 1.5mm was designed and fabricated with a center frequency of 3.325GHz and a bandwidth of 170MHz. The measured results are in agreement with the simulation results better. Thanks to the popular LTCC multi-layer structure, this filter is a very small package and is a standard chip component package that can be used in a wide range of mobile communication systems.