The curve of S21(dB) vs frequency gives insertion loss, ripples and roll off factor. The ripples and the roll off factor can be known on viewing the dB variations/drop in the curve, however the exact technique to measure is not known.
From a industry point of view the roll off is measured based on a reference dB level.
Make your you have no spikes at that frequency and dB level.
The Ripple in the pass bands are generally measured in comparison to your IL min value as it doesn't a lot.
The ripples are measured from s11 characteristic (at least for Czebyshev type of characteristic).
Bandwidth of the filter is measured on the stated ripples level.
Ripples on the s21 characteristic may result from many reasons. First of all from ripples of s11, then losses and source and load frequency characteristics.
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