FieldengRF, Radio & Wireless
SWR ↔ Return Loss
Convert between SWR and return loss via reflection coefficient.
RF, Radio & Wireless
Convert between SWR and return loss via reflection coefficient.
App id: RF-11. Reference version 1.0.
How to fill it
Leave one field blank. The tool solves the rest.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
RL = −20 log10(|Γ|)Inputs
| Name | Unit |
|---|---|
| SWR | 1 |
| Return loss | dB |
Outputs
| Name | Unit |
|---|---|
| SWR | 1 |
| Return loss (hero result) | dB |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
Screening bands in the app: Good · Fair · High · Severe.
| When | Observation | Severity |
|---|---|---|
SWR < 1.5 | Good | info |
SWR < 2 | Fair | info |
SWR < 3 | High | caution |
SWR ≥ 3 | Severe | warning |
Assumptions
- Perfect 1:1 match has unbounded return loss and is rejected.
Provenance
- RL = −20 log10(|Γ|) with Γ from RF-10.