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Who can know your DUT ?Kindly let me know what one must right whe explaining S21 graph.
Who can know what filter you use ?My Device under test is a Passive filter enclosed in a box.
Your 1st plot from post#1 shows frequency from 300 kHz to 200 MHz.I am measuring in between 300MHz and 200 GHz.
According to the first diagram factor 1000 lower frequency.I am measuring in between 300MHz and 200 GHz.