The formula to calculate the Standing Wave Ratio (SWR) is:
\[ \text{SWR} = \frac{1 + \sqrt{\frac{\text{Pr}}{\text{Pf}}}}{1 - \sqrt{\frac{\text{Pr}}{\text{Pf}}}} \]
Where:
Let's consider an example:
Using the formula to calculate the SWR:
\[ \text{SWR} = \frac{1 + \sqrt{\frac{5}{100}}}{1 - \sqrt{\frac{5}{100}}} = \frac{1 + \sqrt{0.05}}{1 - \sqrt{0.05}} \approx \frac{1 + 0.224}{1 - 0.224} \approx \frac{1.224}{0.776} \approx 1.58 \]
This demonstrates that with a reflected power of 5 W and a forward power of 100 W, the SWR is approximately 1.58. ✅