**VSWR (Voltage Standing Wave Ratio)** is the measure of how efficiently RF power is transmitted and is expressed as a ratio of the maximum to minimum amplitude (or the voltage or current) of the corresponding field components appearing on a line that feeds an antenna.

**Return Loss** is a amount of power that is lost to the load and returns back to the system as a reflection. It is expressed in dB - A high return loss means more power is lost at the load.

**Loss in %** is the percentage of power that is lost to the load and returns back to the system
as a reflection. It is expressed in % - A high % loss means more power is lost at the load.

**Mismatch loss** ia s measurement describing the amount of power that will not be available at the load
due to the reflected wave. It indicates the amount of power lost in the system due to the mismatched impedances.

**Reflection Coefficient** indicates how much of an electromagnetic wave is reflected by an impedance
discontinuity in the transmission medium. It is a ratio of the amplitude of the reflected wave to the wave
incident at the junction. The magnitude of the
reflection coefficient does not depend on the length of the line, only the load impedance and the impedance
of the transmission line.

- Here is an Excel spreadsheet containing the VSWR calculations.
- An article that explains VSWR
- Here is a useful "cheat sheet" converting VSWR to the percentage of reflected power.

View our other RF Conversion formula sheets:

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