Calculate the power to the Intentional Radiator (IRP), and the Equivalent Isotropically-Radiated
Power (EIRP) for the following WLAN transmitter:
AP power output = 100mW = 20dBm.
IRP: 20dBm – 3dB = 17dBm =
EIRP: 20dBm -3dB + 6dBi = 23dBm =
Now find the required antenna gain for the AP and cable above, to reach the FCC maximum
EIRP Point-to-Multipoint limit of 4Watts.
4 watts = 36dBm. Must add
of Antenna gain to achieve the required EIRP of 36dBm = 4W