VSWR & Return Loss Calculator
Convert between VSWR, return loss and reflection coefficient, including mismatch loss.
VSWR & Return Loss Calculator
How to use the VSWR & Return Loss Calculator
Choose VSWR or return loss as your input and enter a valid value to calculate the equivalent RF mismatch measurements.
How it works
VSWR, return loss and reflection coefficient describe how well an RF load matches a transmission line. A perfect match has a VSWR of 1:1, a reflection coefficient of zero and theoretically infinite return loss.
Example: A VSWR of 1.5:1 corresponds to a reflection coefficient of 0.2 and return loss of approximately 13.98 dB. Only a small part of the forward power is reflected.
What to keep in mind
A low mismatch loss does not by itself prove that an antenna radiates efficiently; power can also be lost in cable, matching components and resistive elements. Treat the figures as one part of a complete RF assessment.
Frequently asked questions
Is a higher return loss better?
Yes. A higher positive return-loss value indicates less reflected power and a better impedance match.
Can VSWR be below 1:1?
No. A passive measurement below 1:1 is not physically valid and usually indicates a convention or measurement problem.
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