| Definition: | the ratio, generally expressed in decibels, of the apparent power that a specified source would deliver to a load with zero reflection factor at its interface with the source, to the apparent power delivered to a specified load after insertion of a given two port device between the source and the load
NOTE – If the ratio defining the composite loss is less than one, its decibel value is negative and its converse or its opposite value in decibels called composite gain may be used.
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