The VSWR calculator allows you to convert the reflection coefficient (Γ) of an RF system into Voltage Standing Wave Ratio (VSWR).
This tool is useful for RF engineers and technicians to check the suitability of transmission lines and the quality of connections.
Formula used
VSWR = (1 + |Γ|) / (1 – |Γ|)
Or :
Γ = reflection coefficient (absolute value, 0 ≤ Γ < 1)
VSWR = Voltage Standing Wave Ratio, indicating impedance matching
Explanation
The formula shows that the VSWR increases as the reflection coefficient approaches 1.
A Γ close to 0 indicates a good adaptation between the source and the load, with a VSWR close to 1.
The higher Γ, the more the VSWR increases, signaling poor adaptation and power losses through reflection.
Calculation example
For a reflection coefficient Γ = 0.2 :
VSWR = (1 + 0.2) / (1 – 0.2) = 1.2 / 0.8 ≈ 1.5
Benefits and Use
- Allows you to quickly check impedance matching in an RF system.
- Useful for diagnosing losses due to reflections in transmission lines.
- Helps optimize components and connections to reduce VSWR and improve system efficiency.
- Suitable for engineers and technicians working on antennas, coaxial cables and other RF networks.
