What is EIRP (Effective Isotropic Radiated Power)?

EIRP (Effective Isotropic Radiated Power) is a parameter that measures the total radiation capability of a wireless transmission system. EIRP takes into account the antenna gain and the transmitter's output power to estimate the radiated power of the antenna under the assumption of an isotropic antenna. It is a theoretical value used to compare the transmission efficiency of different antenna systems. The calculation formula for EIRP is usually: EIRP (dBm) = Transmitter Power (dBm) + Antenna Gain (dBi) − Feed Line Loss (dB) where: Transmitter Power refers to the power output at the transmitter's conductive port. Antenna Gain refers to the gain of the antenna relative to an ideal isotropic antenna, expressed in dBi. Feed Line Loss refers to the cable loss between the transmitter and the antenna. EIRP is an important parameter because radio communication regulations often limit the maximum value of EIRP to prevent interference with other wireless services. The limitation of EIRP also helps ensure the reasonable use and management of radio waves, especially in frequently used bands such as commercial radio, satellite communication, and mobile communication.