Free Space Path Loss
Free space path loss or fspl represents the amount of energy that a given radio wave loses as it travels through the air away from its source.
Free space path loss. 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. Free space path loss fspl in telecommunication free space path loss fspl is the loss in signal strength of an electromagnetic wave that would result from a line of sight path through free space with no obstacles nearby to cause reflection or diffraction. Loss increases with distance so understanding the fspl is an essential parameter for engineers dealing with rf communications systems.
Free space path loss. Free space path loss fspl calculations are often used to help predict rf signal strength in an antenna system. Ieee defines it as the loss between two isotropic radiators in free space expressed as a power ratio.
It takes frequency and distance as inputs and calculates path loss as output. This value is usually calculated by discounting any obstacles or reflections that might occur in its path. To make it a free space path loss calculator antenna gains of 0 should be entered into both gain boxes.
Free space path loss formula is also mentioned. Free space path loss calculator free space path loss formula. Free space path loss calculator.
As the ieee standard definitions of terms for antennas ieee 145 1983 states that a free space path loss is between two isotropic radiators. Enter values as mentioned in the example to calculate free space path loss. The calculator below is a path loss calculator because it includes the antenna gains.
It is also widely used by wi fi su.