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Voltage standing wave ratio


Voltage Standing Wave Ratio

In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide. Impedance mismatches result in standing waves along the transmission line, and SWR is defined as the ratio of the partial standing wave's amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line.

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When impedance mismatches exist, some of the energy transmitted through will be reflected back to the source. Different amounts of energy will be reflected back depending on the frequency of the energy. VSWR (Voltage Standing Wave Ratio) is a unitless ratio ranging from 1 to infinity, expressing the amount of reflected energy. A value of one indicates that all of the energy will pass through, while any higher value indicates that a portion of the energy will be reflected.

Voltage Standing Wave Ratio

Voltage Standing Wave Ratio,
A measure of the efficiency of a signal interface, especially the impedance match of the antenna to the LNA.

Voltage Standing Wave Ratio. VSWR is an indication of the degree of mismatch between the characteristic impedance of a transmission line and its load. If the line were terminated in its characteristic impedance, all forward power is absorbed, and there are no reflections. As the load varies from the characteristic impedance, some power is reflected back toward the source. Applied to amplifier specifications, VSWR is an indication of the degree to which the input and output impedance of the amplifier approaches 50 ohms, as well as to how the load presented to the amplifiers varies from 50 ohms. A VSWR of 1:1 indicates a peRFect match.

Voltage Standing Wave Ratio

Abbreviation for voltage standing wave ratio. In a transmission line, the ratio of maximum to minimum voltage in a standing wave pattern. Note: The VSWR is a measure of impedance mismatch between the transmission line and its load. The higher the VSWR, the greater the mismatch. The minimum VSWR, i.e., that which corresponds to a perfect impedance match, is unity. (188 )

Voltage Standing Wave Ratio.


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