Effective Isotropic Radiated Power
The radiated (transmitted) power is rated in either dBm or W. Power that comes off an antenna is measured as effective isotropic radiated power (EIRP). EIRP is the value that regulatory agencies, such as the FCC or European Telecommunications Standards Institute (ETSI), use to determine and measure power limits in applications such as 2.4-GHz or 5-GHz wireless equipment. In order to calculate EIRP, add the transmitter power (in dBm) to the antenna gain (in dBi) and subtract any cable losses (in dB).
In a wireless network environment, the Effective Isotropic Radiated Power (EIRP) is calculated using the numerical values of the transmitter power level, cable loss, and antenna gain.
The formula for EIRP is:
đ¸
đź
đ
đ
=
Transmitter Power (dBm)
+
Antenna Gain (dBi)
â
Cable Loss (dB)
EIRP=Transmitter Power (dBm)+Antenna Gain (dBi)âCable Loss (dB)
Explanation:
Transmitter Power (dBm): The power level at which the signal is transmitted from the wireless device.
Cable Loss (dB): The signal loss that occurs due to the length and type of cable used between the transmitter and antenna.
Antenna Gain (dBi): The increase in signal strength provided by the antenna compared to an isotropic radiator.
EIRP represents the total power radiated from the antenna in a specific direction and is crucial for ensuring regulatory compliance and optimizing wireless coverage.
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