5, 结论
本文分析了设计这种滤波器的工程设计方法。给出的耦合系数抽取设计方法可以有效的降低设计难度,增加设计灵活性,提高设计精度,减少设计周期。该方法不仅用于提取类椭圆函数滤波器耦合系数,也可用于提取其他类似结构的率滤波器耦合系数。应用该方法设计了中心频率在4.6GHZ,相对带宽约为20%的带通滤波器,通过利用Ansoft HFSS高频仿真软件仿真,得到了该滤波器的S参数曲线,电性能优良,基本上达到设计仿真的目的,具有高选择性,工作频带宽的特点,因此,拥有一定的工程应用前景。
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