Free Space Loss Formula

In telecommunication, the free-space path loss (FSPL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle free, line-of-sight path through free space (usually air).

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The free space path loss is the loss in signal strength of a signal as it travels through free space. This value is usually calculated by discounting any obstacles or reflections that might occur in its path. IEEE defines it as "The loss between two isotropic radiators in free space, expressed as a power ratio."

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Free Space Path Loss: details & calculator. The simplest scenario for radio signal propagation is free space propagation model when a signal travels in Where a radio signal comes under the influence of other factors, the basic formula can be altered to take account of this. The exponent is altered to.

The formula used by RF Workbench accounts for only the diminishing voltage without accounting for absorption or dispersion by the atmosphere. Both a 1-Way and a 2-Way Path Loss Calculator are included in RF Cafe Calculator Workbook for FREE. These equations are valid when the distance is.

This MATLAB function returns the free space path loss in decibels for a waveform with wavelength lambda propagated over a distance of R meters. In the near-field, the free-space path loss formula is not valid and can result in a loss smaller than 0 dB, equivalent to a signal gain.

Home – RF/Microwave Calculators & Conversions – Free Space Path Loss Calculator. VSWR / Return Loss Calculator. Waveguide Calculator (Circular).


Free Space loss calculation helps RF designers estimate the receive power strength for a given transmitter power. It helps determine the line of sight distance. The loss increases with increas in frequency and obviously with increase in distance. Following is the formula for Free Space los.

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The Free Space Loss can be calculated by the formula listed below which is the transmission loss between two antennas, separated by a distance. Enter the operating frequency in MHz (2400 for 2.4 GHz, 5800 for 5.8 GHz, etc.) and the distance between the two attennas in miles.