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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.
The VSWR is always a real and positive number for antennas. The smaller the VSWR is, the better the antenna is matched to the transmission line and the more power is delivered to the antenna.The minimum VSWR is 1.0. In this case, no power is reflected from the antenna, which is ideal.f the reflection coefficient is given by, then the VSWR is defined by the following formula: The reflection coefficient is also known as s11 or return loss. See the vswr table below to see a numerical mapping between reflected power, s11 and VSWR.