standing-wave ratio
  • For a given transmission line, such as a coaxial cable or waveguide, the ratio of the maximum voltage to the minimum voltage. It is a measure of the impedance matching of the line. This ratio is equal to 1 when there is complete impedance matching, in which case the maximum possible RF power reaches the load, such as an antenna. Also called voltage standing wave ratio.
  • For a given transmission line, such as a coaxial cable or waveguide, the ratio of the maximum current to the minimum current. It is a measure of the impedance matching of the line. This ratio is equal to 1 when there is complete impedance matching, in which case the maximum possible RF power reaches the load, such as an antenna. Also called current standing-wave ratio.
  • acronym SWR

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