Enter the maximum voltage and the minimum voltage into the calculator to determine the voltage standing wave ratio (VSWR).
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VSWR Formula
The following formula is used to calculate a voltage standing wave ratio:
VSWR = Vmax / Vmin
- Where VSWR is the voltage standing wave ratio
- Vmax is the maximum voltage
- Vmin is the minimum voltage
VSWR can also be calculated using several other formulas. One of which used the reflection coefficient as shown:
VSWR = 1+ r / 1 – r
- Where r is the reflection coefficient
VSWR Definition
What is VSWR?
VSWR stands for voltage standing wave ratio. It is a measure of how efficiently radio frequency power is transmitted from a source to a load through a transmission line.
Example Problem
How to calculate VSWR?
- First, determine the maximum voltage.
This is the maximum voltage of the signal along the transmission line. For this example, the maximum voltage is found to be 50 V.
- Next, determine the minimum voltage.
This is the minimum voltage along the same line. In this case, the minimum voltage is found to be 20V.
- Finally, calculate the VSWR.
Calculate the voltage standing wave ratio using the formula above:
VSWR = Vmax / Vmin
VSWR = 50/20
VSWR = 2.5
