The Standing Wave Ratio (SWR), often referred to as Voltage Standing Wave Ratio (VSWR), is a measure used in radio and telecommunications to quantify the efficiency of power transmission in a transmission line. It specifically indicates how well the load (such as an antenna) is matched to the transmission line. SWR is defined as the ratio of the maximum voltage (V_max) to the minimum voltage (V_min) along the transmission line.
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