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      Filtronetics INC 6010 Parretta Drive Kansas City, Missouri (USA) 64120
               Tel: 816-231-7375 Fax: 816-241-0368 Email: filtro@filtro.net

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VSWR / Return Loss

VRSR is simply the ratio of the resistance of the termination and the characteristic
impedance of the source or line. The larger resistance is always in the numerator by
convention. For example, a 75 ohm load termination to a 50 ohm source will yield a
VSWR of 1.5 since 75/50=1.5.

Return Loss - The number of dB that the reflected signal is below the incident signal.

These terms are related by the following formulas

Return Loss =  RL = -20 x logG dB

Refection coefficient = G=(1-VSWR)/(1+VSWR)

VSWR=((10^d)+1)/((10^d)-1)

d=RL/20

The table below relates VSWR, Return Loss, Transmission Loss, and Transmission Power.
                                                  Download Table as PDF.