Isotropic radiator
. . . .
Isotropic radiator
- An isotropic radiator is a point source that radiates signal equally in all directions.
- The RF transmission of an antenna is usually compared or referenced to an isotropic radiator.
- It is important to be able to calculate the radiating power of the antenna so that you can determine how strong a signal is at a certain distance from the antenna.
- You may also want to compare the output of one antenna to that of another.
- The gain, or increase, of power from an antenna when compared to what an isotropic radiator would generate is known as decibels isotropic (dBi).
- Another way of phrasing this is decibel gain referenced to an isotropic radiator or change in power relative to an antenna. The dBi value is measured at the strongest point, or the focus point, of the antenna signal. Because antennas always focus their energy more in one direction than another, the dBi value of an antenna is always a positive gain and not a loss.
Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
|
|