The standing wave ratio (SWR) measures the efficiency of power transfer in a transmission line by comparing the maximum and minimum voltages along the line. It is a ratio of the amplitude of the maximum voltage to the amplitude of the minimum voltage, reflecting how well the impedance of the load matches the impedance of the transmission line. An ideal standing wave ratio indicates perfect impedance matching and minimal reflected power.

The voltage standing wave ratio (VSWR) is a specific measurement of the standing wave ratio (SWR) that quantifies the extent of impedance mismatching in a transmission line. It is expressed as the ratio of the peak voltage to the minimum voltage in the standing wave pattern. A lower VSWR value signifies better impedance matching and more efficient power transfer.

The SWR standing wave ratio (SWR) is a measure of how effectively power is transmitted through a transmission line and absorbed by the load. It is calculated as the ratio of the amplitude of the maximum voltage to the amplitude of the minimum voltage along the line. A low SWR indicates good impedance matching, while a high SWR indicates that a significant portion of the power is reflected back due to impedance mismatching.

### What should be the VSWR value?

The ideal VSWR value should be as close to 1:1 as possible, indicating perfect impedance matching with no reflected power. In practical applications, a VSWR of 1.5:1 or lower is generally acceptable. Higher values indicate greater impedance mismatch, leading to inefficiencies and potential damage to equipment.

Standing wave ratios (SWR) cannot be less than 1:1. An SWR of 1:1 represents perfect impedance matching with no reflected power. Values lower than this are not physically possible, and any SWR value must be equal to or greater than 1:1.