Reflection coefficient calculator – reflection loss
This calculator transforms a reflection coefficient (Γ) into return loss (RL) expressed in dB. Return loss indicates the amount of power returned to the source due to impedance mismatch in an RF transmission line. This helps to quickly assess the quality of the match of a circuit, cable or antenna.
Useful for RF engineers, telecommunications technicians and antenna designers wishing to verify the matching performance of a system.
Formula
RL = -20 × log10(Γ)
Explanation of the formula
- Γ represents the reflection coefficient, i.e. the ratio between the reflected voltage and the incident voltage.
- The logarithm measures the ratio in decibel (dB) scale.
- A higher RL value means better adaptation and therefore less reflected power.
What does a reflection coefficient of 0.1 mean?
Input : Γ = 0.1
Output : RL = 20 dB
Benefits and uses
- Rapid measurement of the adaptation quality of an RF line.
- Allows you to evaluate the performance of antennas and filters.
- Facilitates the diagnosis of losses due to poor impedance matching.
- Essential tool for the design and maintenance of RF systems.