10.3: Antenna gain, effective area, and circuit properties
https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_and_Applications_(Staelin)/10%3A_Antennas_and_Radiation/10.03%3A_Antenna_gain_effective_area_and_circuit_properties
WebAntenna gain G(θ,φ) is defined as the ratio of the intensity P(θ,φ,r) to the intensity [Wm-2] that would result if the same total power available at the antenna terminals, P A [W], were radiated isotropically over 4π steradians. G(θ,φ) is often called “gain over isotropic” where:
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