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VSWR (Voltage Standing Wave Ratio) is a metric commonly used with antenna systems for ham or shortwave radio communication.VSWR is normally defined as a ratio with a 1:1 VSWR, indicating that there is an exact or perfect match between all antenna system elements.SWR (Voltage Standing Wave Ratio) is a metric commonly used with antenna systems for ham or shortwave radio communication.
When an antenna is not matched to the receiver, power is reflected (so that the reflection coefficient, , is not zero). This causes a reflected voltage wave, which creates standing waves along the transmission line. The result are the peaks and valleys as seen in Figure 1. If the VSWR = 1.0, there would be no reflected power and the voltage would have a constant magnitude along the transmission line.