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Return Loss Formula

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Return loss is a measure in relative terms of the power of the signal reflected by a discontinuity in a transmission line or optical fiber. Check FAQs

R L = - 20 \cdot \log 10 (r)

R_L - Return Loss?r - Reflection Coefficient?

Return Loss Example

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Here is how the Return Loss equation looks like with Values.

Here is how the Return Loss equation looks like with Units.

Here is how the Return Loss equation looks like.

10.4576 = - 20 \cdot \log 10 (0.3)

10.4576dB = - 20 \cdot \log 10 (0.3)

10.4576 = - 20 \cdot \log 10 (0.3)

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Return Loss Solution

Follow our step by step solution on how to calculate Return Loss?

FIRST Step Consider the formula

R L = - 20 \cdot \log 10 (r)

Next Step Substitute values of Variables

∴

R L = - 20 \cdot \log 10 (0.3)

Next Step Prepare to Evaluate

∴

R L = - 20 \cdot \log 10 (0.3)

Next Step Evaluate

∴

R L = 10.4575749056068dB

LAST Step Rounding Answer

∴

R L = 10.4576dB

Return Loss Formula Elements

Variables

Functions

Return Loss

Return loss is a measure in relative terms of the power of the signal reflected by a discontinuity in a transmission line or optical fiber.

Symbol: R_L

Measurement: NoiseUnit: dB

Note: Value can be positive or negative.

Formulas to find Return Loss

Reflection Coefficient

Reflection Coefficient is a parameter that describes how much of a wave is reflected by an impedance discontinuity in the transmission medium.

Symbol: r

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reflection Coefficient

log10

The common logarithm, also known as the base-10 logarithm or the decimal logarithm, is a mathematical function that is the inverse of the exponential function.

Syntax: log10(Number)

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How to Evaluate Return Loss?

Return Loss evaluator uses Return Loss = -20*log10(Reflection Coefficient) to evaluate the Return Loss, The Return Loss formula is defined as is a measure in relative terms of the power of the signal reflected by a discontinuity in a transmission line or optical fiber. Return Loss is denoted by R_L symbol.

How to evaluate Return Loss using this online evaluator? To use this online evaluator for Return Loss, enter Reflection Coefficient (r) and hit the calculate button.

FAQs on Return Loss

What is the formula to find Return Loss?

The formula of Return Loss is expressed as Return Loss = -20*log10(Reflection Coefficient). Here is an example- 10.45757 = -20*log10(0.3).

How to calculate Return Loss?

With Reflection Coefficient (r) we can find Return Loss using the formula - Return Loss = -20*log10(Reflection Coefficient). This formula also uses Common Logarithm (log10) function(s).

Can the Return Loss be negative?

Yes, the Return Loss, measured in Noise can be negative.

Which unit is used to measure Return Loss?

Return Loss is usually measured using the Decibel[dB] for Noise. Neper[dB], MilliDecibel[dB] are the few other units in which Return Loss can be measured.

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