The Full Form of VSWR is Voltage Standing Wave Ratio.
Standing waves are an important issue when looking at feeders / transmission lines, and the standing wave ratio or more commonly the voltage standing wave ratio, VSWR is as a measurement of the level of standing waves on a feeder.
Standing waves represent power that is not accepted by the load and reflected back along the transmission line or feeder.
Although standing waves and VSWR are very important, often the VSWR theory and calculations can mask a view of what is actually happening. Fortunately, it is possible to gain a good view of the topic, without delving too deeply into VSWR theory.
VSWR
means
Voltage Standing Wave Ratio
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