VSWR - A measure of the uniformity of impedance along a transmission line, or the quality of the impedance match between a line and the source or load.

In a transmission line, the ratio of maximum to minimum voltage in a standing wave pattern.

In a waveguide, the ratio of the electric field (voltage) at a maximum point to that of an adjacent minimum point.

A measure of the reflection, resulting from a ratio of the input signal to the reflected signal. VSWR = (1+L) / (1-L)

The amount of reflected signal due to impedance mis-match.

The ratio of the maximum effective voltage to the minimum effective voltage measured along the length of a mismatched radio frequency transmission line.

For a switching card, the loss due to the mismatch introduced into the signal by the card contacts and conductors. Expressed as a ratio of the highest voltage to the lowest voltage found in the signal.

A comparison of the power transmitted to the power received back from the system with respect to a 50 Ohm line impedance. A VSWR of 1.0 is a 100% efficient antenna, a VSWR of 1.5 is 97%, a VSWR of 2.0 is 89%.

Ratio of maximum voltage of the standing wave to the minimum voltage of the standing wave. See also Standing Wave Ratio.

VSWR of the antenna is the ratio of the maximum to minimum values of voltage in the standing wave pattern appearing along a lossless 50 Ohms transmission line with an antenna as the load.