Band-pass filter (BPF) role is to allow a certain period of signals within the frequency range, while blocking signals outside this band.
带通滤波器(BPF)的作用是答应某一段频带范围内的信号通过，而将此频带以外的信号阻断。
Finally, by using the method a 2-order lumped band-pass filter (BPF) is designed and developed.
最后利用该方法设计并制作了一个二阶集总带通滤波器。
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