Enter the reflected power and the forward power into the Calculator. The calculator will evaluate the Standing Wave Ratio.
Standing Wave Ratio Formula
SWR = (1+SQRT(Pr/Pf)) / (1-SQRT(Pr/Pf))
Variables:
- SWR is the Standing Wave Ratio (())
- Pr is the reflected power
- Pf is the forward power
How to Calculate Standing Wave Ratio?
The following steps outline how to calculate the Standing Wave Ratio.
- First, determine the reflected power.
- Next, determine the forward power.
- Next, gather the formula from above = SWR = (1+SQRT(Pr/Pf)) / (1-SQRT(Pr/Pf)).
- Finally, calculate the Standing Wave Ratio.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
reflected power = 35
forward power = 25
FAQs
What is the significance of Standing Wave Ratio (SWR) in telecommunication?
SWR is a measure of the efficiency of the power transfer from the transmitter to the antenna in a telecommunication system. A lower SWR indicates better efficiency, meaning most of the power is transmitted to the antenna with minimal reflections.
How does reflected power affect the SWR?
Reflected power directly impacts the SWR value. Higher reflected power indicates more power is being reflected back towards the source, resulting in a higher SWR. This signifies inefficient power transfer and potential damage to the transmitter over time.
Can SWR be reduced and how?
Yes, SWR can be reduced by improving the match between the transmission line and the antenna. This can be achieved by using matching devices like tuners, stubs, or baluns to minimize reflections and thus lower the SWR.
Is it possible to have an SWR of 1:1, and what does it mean?
Yes, an SWR of 1:1 is possible and represents the ideal condition where there is no reflected power, indicating perfect impedance matching between the transmission line and the antenna. This scenario results in the most efficient power transfer.
