VSWR & Return Loss Calculator | Reflection & Mismatch

Q: What is a good VSWR?

VSWR ≤ 1.5:1 (Return Loss ≥ 14 dB) is generally acceptable.

VSWR

1.00:1

Return Loss (dB)

∞ dB

Reflection Coefficient (Γ)

0.000

Mismatch Loss (dB)

0.000 dB

PerformanceExcellent (VSWR < 1.2)

1.01.52.03.0+

● Transmitted ● Reflected

📊 Quick Reference (VSWR to Return Loss)

VSWR	Return Loss (dB)	Γ	ML (dB)

Click any row to load values.

📐 Formulas & Definitions

VSWR = (1 + |Γ|) / (1 - |Γ|)

Return Loss (dB) = -20·log₁₀(|Γ|)

Mismatch Loss (dB) = -10·log₁₀(1 - |Γ|²)

Good practice: VSWR ≤ 1.5 (RL ≥ 14 dB)

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📘 VSWR & Return Loss Guide

VSWR (Voltage Standing Wave Ratio) measures impedance mismatch in RF systems. Return Loss quantifies reflected power. Use this calculator to convert between VSWR, Return Loss, Reflection Coefficient (Γ), and Mismatch Loss.

❓ FAQ

What is a good VSWR?

VSWR ≤ 1.5:1 (Return Loss ≥ 14 dB) is generally acceptable. Below 1.2:1 is excellent.

How are VSWR and Return Loss related?

Return Loss (dB) = -20·log₁₀( (VSWR-1)/(VSWR+1) ). Higher return loss means better match.

What is Mismatch Loss?

Mismatch Loss quantifies power lost due to reflection. ML(dB) = -10·log₁₀(1 - |Γ|²).

📡 VSWR & Return Loss

📘 VSWR & Return Loss Guide

❓ FAQ