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Return Loss(dB) Formula

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Return loss is a measure of the amount of power reflected back from a transmission line or an antenna, typically expressed in decibels (dB). Check FAQs

P ret = 20 \cdot \log 10 (\frac{P i}{P ref})

P_ret - Return Loss?P_i - Incident Power Fed into Antenna?P_ref - Reflected Power by Antenna?

Return Loss(dB) Example

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

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

Here is how the Return Loss(dB) equation looks like.

5.368 = 20 \cdot \log 10 (\frac{15.25}{8.22})

5.368dB = 20 \cdot \log 10 (\frac{15.25W}{8.22W})

5.368 = 20 \cdot \log 10 (\frac{15.25}{8.22})

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Return Loss(dB) Solution

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

FIRST Step Consider the formula

P ret = 20 \cdot \log 10 (\frac{P i}{P ref})

Next Step Substitute values of Variables

∴

P ret = 20 \cdot \log 10 (\frac{15.25W}{8.22W})

Next Step Prepare to Evaluate

∴

P ret = 20 \cdot \log 10 (\frac{15.25}{8.22})

Next Step Evaluate

∴

P ret = 5.36796052285508dB

LAST Step Rounding Answer

∴

P ret = 5.368dB

Return Loss(dB) Formula Elements

Variables

Functions

Return Loss

Return loss is a measure of the amount of power reflected back from a transmission line or an antenna, typically expressed in decibels (dB).

Symbol: P_ret

Measurement: NoiseUnit: dB

Note: Value can be positive or negative.

Formulas to find Return Loss

Incident Power Fed into Antenna

The incident power fed into antenna refers to the power that is delivered from the transmission line to the antenna.

Symbol: P_i

Measurement: PowerUnit: W

Note: Value can be positive or negative.

Formulas to find Incident Power Fed into Antenna

Reflected Power by Antenna

Reflected power by antenna refers to the power that is not effectively transmitted from a source, such as a transmitter or generator, into a load or an antenna system.

Symbol: P_ref

Measurement: PowerUnit: W

Note: Value should be greater than 0.

Formulas to find Reflected Power by Antenna

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(dB)?

Return Loss(dB) evaluator uses Return Loss = 20*log10(Incident Power Fed into Antenna/Reflected Power by Antenna) to evaluate the Return Loss, The Return loss(dB) formula is defined as logarithmic ratio measured in dB that compares the power reflected by the antenna Pr to the power that is fed into the antenna from the transmission line Pi. Return Loss is denoted by P_ret symbol.

How to evaluate Return Loss(dB) using this online evaluator? To use this online evaluator for Return Loss(dB), enter Incident Power Fed into Antenna (P_i) & Reflected Power by Antenna (P_ref) and hit the calculate button.

FAQs on Return Loss(dB)

What is the formula to find Return Loss(dB)?

The formula of Return Loss(dB) is expressed as Return Loss = 20*log10(Incident Power Fed into Antenna/Reflected Power by Antenna). Here is an example- 5.367961 = 20*log10(15.25/8.22).

How to calculate Return Loss(dB)?

With Incident Power Fed into Antenna (P_i) & Reflected Power by Antenna (P_ref) we can find Return Loss(dB) using the formula - Return Loss = 20*log10(Incident Power Fed into Antenna/Reflected Power by Antenna). This formula also uses Common Logarithm (log10) function(s).

Can the Return Loss(dB) be negative?

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

Which unit is used to measure Return Loss(dB)?

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

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