The parasitic effects of inductance and capacitance in each component of a 2nd-order Pi-shaped inductively coupled LTCC filter were analyzed, and a new method to analyze the parasitic inductive coupling was proposed. Based on the analysis results, one 2nd-order Pi-shaped inductively coupled and one 2nd-order Pi-shaped capaeitively coupled LTCC bandpass filters were designed. The center frequency, bandwidth, insertion loss and return loss were designed to be 2.45 GHz, 32.65％ (fractional bandwidth), 2 dB and 18 dB respectively for the inductively coupled filter, while to be 2.45 GHz, 100 MHz, 2 dB and 15 dB respectively for the capacitively coupled filter. The dimensions of two filters were simulated using the HFSS software. The simulation results show that the dimensions of the inductively coupled and capacitively coupled filter are 3.440 mmx2.310 mm×0.625 mm and 4.200 mmx2.400 mmx0.540 mm, respectively. This indicates that it is feasible to take advantage of the inductive coupling in filter design.%对二阶Pi型电感耦合LTCC滤波器中各个元件的电容及电感寄生效应进行了分析,提出了一种新的寄生电感耦合分析方法,并根据分析结果设计了一个二阶Pi型电感耦合和一个二阶Pi型电容耦合LTCC带通滤波器,其中,电感耦合滤波器的设计指标为:中心频率2.45GHz,相对带宽32.65%,带内插入损耗2dB,回波损耗18 dB;电容耦合滤波器的设计指标为:中心频率2.45 GHz,带宽100 MHz,带内衰减2 dB,通带回波损耗15 dB,利用HFSS软件对两个滤波器进行了建模及仿真计算.仿真结果表明,电感耦合及电容耦合LTCC带通滤波器的尺寸分别为3.440mm×2.310mm×0.625mm和4.20min×2.40min×0.54mm.这表明在滤波器设计中对感性耦合加以适当利用是可行的.
展开▼
