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VSWR (Voltage Standing Wave Ratio) is a metric commonly used with antenna systems for ham or shortwave radio communication.VSWR is normally defined as a ratio with a 1:1 VSWR, indicating that there is an exact or perfect match between all antenna system elements.SWR (Voltage Standing Wave Ratio) is a metric commonly used with antenna systems for ham or shortwave radio communication.
A closely related parameter is the reflection coefficient. This term not only records the magnitude of the reflected wave but also its angle. Because the reflection coefficient measures magnitude of reflection and its angle it is VECTOR measurement. VSWR only measures magnitude and is therefore a SCALAR measurement. The VSWR can be calculated if the Reflection coefficient is known, see below. The table also shows Return loss and Mismatch loss. Return loss (RL) is a measure of how much power is reflected from a load or termination.