Definition: | the ratio, along a transmission line, of a maximum to an adjacent minimum magnitude of a particular field component of a standing wave
NOTE 1 – This ratio is equal to: (1 + r) / (1 — r) where r is the modulus of the amplitude reflection factor.
NOTE 2 – The standing-wave ratio expressed as the reciprocal of the ratio defined above is occasionally used, but this usage is deprecated.
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