# standing-wave ratio

## Definitions

### Electronics

- 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. - acronymSWR