Bridging loss

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Bridging loss is the loss, at a given frequency, that results when an impedance is connected across a transmission line.{{Cite book|title=Communications Standard Dictionary|last=Weik|first=Martin|publisher=Van Nostrand Reinhold|year=1989|isbn=9781461566748|location=New York|pages=109}} It is expressed as the ratio, in decibels, of the signal power delivered to a given point in a system downstream from the bridging point prior to bridging, to the signal power delivered to the given point after bridging. The term is introduced because return loss is not applicable to the high-impedance input conditions.{{Cite book|title=Newnes Telecommunications Pocket Book|last=Edis|first=E.A.|last2=Varrall|first2=J.E.|publisher=Butterworth-Heinemann|year=1997|isbn=0750603070|location=Oxford|pages=247}} The term is also used in telephone practice and is synonymous with the insertion loss that results from bridging an impedance across a circuit.{{Cite book|title=Van Nostrand's Scientific Encyclopedia|last=Considine|first=Douglas|last2=Considine|first2=Glenn|publisher=Springer Science+Business Media|year=1995|isbn=9781475769203|location=New York|pages=470}}