# Path Loss

Path loss (or path attenuation) is the reduction in power density (attenuation) of an electromagnetic wave as it propagates through space. Path loss is a major component in the analysis and design of the link budget of a telecommunication system.

This term is commonly used in wireless communications and signal propagation. Path loss may be due to many effects, such as free-space loss, refraction, diffraction, reflection, aperture-medium coupling loss, and absorption. Path loss is also influenced by terrain contours, environment (urban or rural, vegetation and foliage), propagation medium (dry or moist air), the distance between the transmitter and the receiver, and the height and location of antennas.

### Other articles related to "path loss, loss, path":

Hata Model For Urban Areas - Points To Note Walfisch and Bertoni Model
... The model considers the path loss, S, to be a product of three factors ... S = Po Q2 P1 where P0 represents free space path loss between isotropic antennas given by Po = (lambda / 4 pai R)2 (whole square) The factor Q2 gives the reduction in the ... P1 term is based upon diffraction and determines the signal loss from the rooftop to the street ...
Log-distance Path Loss Model
... The log-distance path loss model is a radio propagation model that predicts the path loss a signal encounters inside a building or densely populated ...
Path Loss - Examples
... operate in the UHF band, the value of the path loss in built-up areas can reach 110 -- 140 dB for the first kilometer of the link between the BTS and the mobile ... The path loss for the first ten kilometers may be 150 -- 190 dB (Note These values are very approximate and are given here only as an illustration of the range in which ...
Log-distance Path Loss Model - Mathematical Formulation - The Model
... Log-distance path loss model is formally expressed as where is the total path loss measured in Decibel (dB) is the transmitted power in dBm, where is ... is the path loss at the reference distance d0 ... Unit Decibel (dB) is the length of the path ...

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