Link With Scattering Parameters
In case the two measurement ports use the same reference impedance, the insertion loss is defined as:
and not, as often mistakenly thought, by:
- dB.
It is the extra loss produced by the introduction of the DUT between the 2 reference planes of the measurement. Notice that the extra loss can be introduced by intrinsic loss in the DUT and/or mismatch. In case of extra loss the insertion loss is defined to be positive.
For more detail, see the main article on Scattering Parameters.
Read more about this topic: Insertion Loss
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