一种基于LTCC的宽阻带高抑制带通滤波器的设计

提出了一种基于LTCC技术的新型宽阻带高抑制带通滤波器的实现方法。通过金属柱加载接地电容形成谐振单元,一方面能够有效缩小滤波器的体积,另一方面由于其高阶谐波分量远离中心频率且被有效地抑制,实现了高频端衰减性较好的宽阻带。采用六级谐振器提高滤波器的矩形系数和带外抑制性能。最终设计了一款中心频率为4.55GHz、带宽为1.3GHz的带通滤波器,阻带7.5~20GHz内的衰减均优于60dB,在7.5~18GHz内的衰减均大于80dB,体积仅为6.2mm×2.0mm×1.2mm。实测结果与HFSS仿真结果较为吻合。

Design of a Bandpass Filter with Wide Stopband and High Suppression Based on LTCC

A new implementation method of wide stopband and high suppression bandpass filter based on LTCC technology was proposed.The grounding capacitor was loaded by a metal column to form a resonant unit,which could effectively reduce the volume of the filter.On the other hand,because high-order harmonic components were far from the center frequency and were effectively suppressed,a wide stopband with good attenuation were realized at the high frequency. Six resonant units were used to improve the rectangular coefficient and out-of-band rejection of the filter.Finally,a bandpass filter with a center frequency of 4.55GHz and a bandwidth of 1.3 GHz is designed.The attenuation in the stop band from 7.5GHz to 20.0GHz is better than 60 dB,and the attenuation from 7.5GHz to 18GHz is more than 80dB.The volume is only 6.2 mm×2.0mm×1.2mm.The measurement results show a good match with the HFSS simulation.