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I'm not sure if any of you have ever used a device that measures RF transmission line loss and presents it as a graph of Insertion Loss (dB) vs. Frequency (GHz), but that is exactly what I'm trying to calculate. I've been looking through equations for days, and I just don't understand how these tools work. The equation I see everywhere for Insertion Loss is IL = 10 * log_10(P_t/P_r) where P_t is the transmitted power before insertion, and P_r is power received after insertion. But if power isn't a function of frequency (only impedance, current, and voltage), then how are they related/calculated? I'm a software engineer, so my knowledge of this kind of this is limited, but I'd really appreciate if someone could help me understand!

Thanks again!