VSWR / Return Loss Calculator

The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of the listed input types. VSWR (voltage standing wave ratio, sometimes pronounced "viswar"), is the ratio of the maximum standing wave amplitude at one node to the minimum amplitude at another node in a system. In one typical RF application, VSWR is used to measure the amount of reflection due to impedance mismatch.

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Calculation

Result:

VSWR:
Reflection Coeff.:
Return Loss:
Mismatch Loss:

Prefix Symbol Value
Tera 'T' 1012
Giga 'G' 109
Mega 'M' 106
kilo 'k' 103
Prefix Symbol Value
pico 'p' 10-12
nano 'n' 10-9
micro 'u' 10-6
milli 'm' 10-3

Pasternack’s voltage standing wave ratio / return loss calculator, like our other online RF calculators, are suited for designers and engineers who require solutions for radio frequency related questions for products and designs. This is especially true during the planning and design phase of projects.

To measure how RF power is transmitted into a load, VSWR will let you do so, efficiently. In an ideal situation, when connecting a power amplifier to an antenna through a transmission line, there should be no reflections, allowing all the signals to seamlessly be transmitted to the antenna. However, that is not practically possible, with some signals reflected back to the transmission line. A VSWR calculation allows you to calculate how much of this signal is reflected back into the system. The higher the VSWR figure, the poorer the transmission line efficiency and reflected energy.

As a leading manufacturer and supplier of RF, microwave and millimeter wave products, many industries around the world rely on Pasternack radio frequency experience and expertise. Some of the industries that use our RF/microwave and mmWave items include avionics, military electronics, IFF, SATCOM, ECM, industrial/manufacturing and oil/gas. Our large selection of RF calculators is part of our online technical resource library, and further complements the Engineers Resource Center section.

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