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Equation of return loss specification?

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jake1120

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hi. I know the equation like SDD11, SDD22 < -6.0+9.2*log10 (2*f/fb) dB for fb/7<f<fb.
What do numbers like -6.0 or +9.2 mean here? What is the criterion for the above equation?
 

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You forgot to mention the source of the equation. That's necessary for anyone who wants to understand the context.
 

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I guess, the imaginary part of the SDDxxis frequency dependent in this equation.
"j" operator is missing.
 

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