If you are a newcomer in the RF industry, it must be difficult to distinguish VSWR and return loss. The following is a comparison table of VSWR and return loss.
VSWR ( (Voltage Standing Wave Ratio)is defined as the ratio of the maximum voltage to the minimum voltage in standing wave pattern along the length of a transmission line structure. It varies from 1 to (plus) infinity and is always positive. Unless you have a piece of slotted line-test equipment this is a hard definition to use, especially since the concept of voltage in a microwave structure has many interpretations.
Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB).
The Comparison table of VSWR and Return Loss