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Answer Posted / sudhin r
Standing wave ratio (SWR) is the ratio of the amplitude of a
partial standing wave at an antinode (maximum) to the
amplitude at an adjacent node (minimum), in an electrical
transmission line.
The SWR is usually defined as a voltage ratio called the
VSWR, for voltage standing wave ratio. For example, the VSWR
value 1.2:1 denotes a maximum standing wave amplitude that
is 1.2 times greater than the minimum standing wave value.
It is also possible to define the SWR in terms of current,
resulting in the ISWR, which has the same numerical value.
The power standing wave ratio (PSWR) is defined as the
square of the VSWR.
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