Two parameters are used to specify the characteristics of a BPF: passband centrefrequency and resonance bandwidth.
带通滤波器的特性通过两个参数表示：带通中心频率和共鸣带宽。
2
Furthermore, the influences of SAWF center frequency are display by the curves, as a result, this cutting error have a kind of influences on centrefrequency of SAWF.
计算结果表明，这种切割误差对声表面波滤波器中心频率有一定影响。
3
It is shown experimentally that a method available for compensating for the diffraction by centrefrequency in narrow band filters can effectively improve their stopband characteristics.