IEVref: 702-07-25 ID: Language: en Status: Standard Term: return loss Synonym1: Synonym2: Synonym3: Symbol: Definition: the modulus of the reciprocal of the reflection factor, generally expressed in decibels NOTE – When impedances can be defined, the return loss is given by the formula: $-\text{\hspace{0.17em}}20\text{\hspace{0.17em}}\text{lg}\text{\hspace{0.17em}}|r|=20\text{\hspace{0.17em}}\text{lg}\text{\hspace{0.17em}}|\frac{\underset{_}{Z}-{\underset{_}{Z}}^{\prime }}{\underset{_}{Z}+{\underset{_}{Z}}^{\prime }}|$ where Z is the characteristic impedance of a transmission line ahead of a discontinuity, or the impedance of a source, and Z′ is the impedance after the discontinuity or the load impedance seen from the junction between the source and the load. Publication date: 1992-03 Source: Replaces: Internal notes: 2017-06-02: Cleanup - Remove Attached Image 702-07-25.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: