This tool provides an estimate of the Return Loss of a cascade of two RF subsystems assuming there is no gain, attenuation or impedance transformation in either system. *Use this calculator to find the cascaded RL of an attenuator and amplifier*.

Enter the Return Loss (RL) in dB of each element in the RF chain.

**Formula**

The reflection coefficient for each element is

**Γ = 10 ^{-(RL/20)}**

The cascaded Return Loss is

**RL = −20*Log _{10}(√(Γ_{1}^{2} + Γ_{2}^{2})**