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[SOLVED] S21 graphs, comparison and understanding

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GulraizAhmed

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Hello, i have measured S21 parameter on network analyser and i need to right dow its characteristics and made a comparison with another s 21 graph .

Kindly let me know what one must right whe explaining S21 graph.
i am uploading graphs here.
1st graph
DDM.png

2nd graph

DM Direct.PNG
 

Sorry i am new here. My Device under test is a Passive filter enclosed in a box. I am measuring in between 300MHz and 200 GHz.
 

I agree with pancho_hidebo. Both S21 magnitude curves show an attenuation of > 35 dB for most frequencies. We really can't know if this an intended behavior (e.g. a filter no suppress any RF on a low frequency or DC line) or failure.

I am measuring in between 300MHz and 200 GHz.
Click to expand...
According to the first diagram factor 1000 lower frequency.
 

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