What is the difference between EIRP and ERP?

Antennas RF Basics 
What is the difference between Effective Isotropic Radiated Power and Effective Radiated Power?
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Editorial Team - everything RF

May 22, 2018

EIRP is the Effective isotropic radiated power is the total power radiated by a hypothetical isotropic antenna in a single direction. It gives the signal strength in the direction of the antenna's strongest beam.

ERP is Effective Radiated Power is the total power radiated by an actual antenna relative to a half-wave dipole rather than a theoretical isotropic antenna. A half-wave dipole has a gain of 2.15 dB compared to an isotropic antenna.

The relation between EIRP and ERP can be seen in the equation below: