about bandstop filter ,how to make its side lope be 0 dB

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Roger
Roger il 26 Mag 2015
i use the filter design tools to design bandstop filter ,but in some frequency of passband ,its gain is larger than 0 db,how to make all pass band be 0 db gain ,like this when it is large than 13k hz, the gain is about 16db.

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