Discussion
What does a filter's shape factor describe?
Answer: A
Shape factor is the ratio of the width at 60 dB down to the width at 6 dB down, so a value near one describes almost vertical skirts and a large value a sloppy filter. Gain over bandwidth is a different figure entirely. The section count influences the shape factor without defining it. And insertion loss is a separate specification. A single number that captures skirt steepness is what lets two filters of the same nominal bandwidth be compared honestly.
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