Given an access point with 100 mW of output power and 3 dB loss, what is the EIRP from an antenna with 10 dBi gain?

To calculate the Effective Isotropic Radiated Power (EIRP), it is important to understand the components involved: the output power of the access point, any losses due to components such as cables or connectors, and the gain of the antenna.

Starting with the output power of the access point, which is 100 mW, this value represents the power of the signal being transmitted. The next factor is the loss, which is 3 dB. When we convert dB losses back to a power ratio, a 3 dB loss means that the power is effectively reduced to half its original value. Therefore, the output power after accounting for the 3 dB loss is:

100 mW - 3 dB = 100 mW / 2 = 50 mW.

Now, we need to factor in the gain from the antenna, which is 10 dBi. Antenna gain is often expressed in decibels relative to an isotropic radiator, and in this case, we can convert dBi gain into a power increase. Specifically, a 10 dBi gain translates to a power increase of about 10 times the input power.

This means we take the power after loss (50 mW) and