## FANDOM

186 Pages

The wireless personal area network is a networking system which has a short distance coverage around 10 ~ 20m. We use wireless electronic devices in home for more convinence than wired electronic devices. The connectivity performance can be varied with respect to the distance from the source device to the destination device.

The first factor in propagation loss is due to free space propagation, which is formulated as follows:

$P_{fs} = \frac{ P_{rad} }{ 4 \pi d^2} \text{ in } W/m^2$

where $P_{rad}$ is the radiation power at the source.