Physics

VSWR Calculator (Voltage Standing Wave Ratio)

Find VSWR and return loss from the reflection coefficient.

Calculated Output

VSWR (:1) 1.5

Return loss (dB) 13.979

Power reflected (%) 4

Formula: VSWR = (1 + |Γ|) ÷ (1 − |Γ|)

Step-by-Step Breakdown

1. Values used:

2. Reflection coefficient |Γ| = 0.2

4. VSWR = 1.5:1

5. Return loss = 13.979dB

6. Power reflected = 4%

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The math behind it

VSWR = (1+|Γ|)/(1−|Γ|). Return loss = −20·log₁₀|Γ|, and reflected power is |Γ|².

|Γ| = 0.2 → VSWR 1.5:1, return loss 14 dB, 4% reflected.

What's a good VSWR?

Below 1.5:1 is generally considered a good match.