Voltage Standing Wave Ratio (VSWR) Calculator

The Voltage Standing-wave ratio, also (SWR) is a mathematical expression of the non-uniformity of an electromagnetic field on a transmission line such as coaxial cable. This calculator can be used to indicate the degree of mismatch between a transmission line and its load. Enter the value for VSWR in the below calculator to find out the values for Reflection Co-efficient, Reflected Power in % and Return loss in dB and the mismatch loss in dB. Enter VSWR value other than 1 or 0. The negative values in the mismatch loss field indicates the loss of signals.

Return, Mismatch Loss Calculator

%
dB
dB
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Formula:

|Γ| = (v-1) / (v+1) p = 100 * Γ 2 d = 20 * Log(Γ) l = 10 * Log(1 - Γ2) Where, v = Voltage Standing Wave Ratio Γ = Reflection Coefficient p = Reflected Power d = Reflected Power(dB) l = Mismatch Loss

Reflection Coefficient

If VSWR is 1.5, then the

|Γ| = (v-1) / (v+1)
     = (1.5 - 1 ) / (1.5+1)
     = 0.5 / 2.5
     = 0.2
Therefore, |Γ| value is 0.2

Reflected Power

p = 100 * Γ 2
     = 100 * 0.2 2
     = 100 * 0.04
     = 4
Therefore, p value is 4%

Reflected Power(dB)

d = 20 * log(Γ)
     = 20 * log(0.2)
     = 20 * -0.69897
     = -13.9794
Therefore, d value is -13.9794 dB

Mismatch Loss

l = 10 * Log(1 - Γ2)
     = 10 * log(1 -0.22)
     = 10 * log(0.96)
     = 10 * (-0.017728)
    =-0.177
Therefore, l value is -0.177 dB

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