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10.13: Effective Aperture
https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_II_(Ellingson)/10%3A_Antennas/10.13%3A_Effective_Aperture
From elementary circuit theory, the power delivered to a load $Z_L$ is maximized when the load is conjugate matched to the antenna impedance; i.e., when $Z_L=Z_A^*$ where $Z_A$ is the impedance ...From elementary circuit theory, the power delivered to a load $Z_L$ is maximized when the load is conjugate matched to the antenna impedance; i.e., when $Z_L=Z_A^*$ where $Z_A$ is the impedance of the antenna. where $S^i_{co}$ is the incident power density (SI base units of W/m $^2$ ) that is co-polarized with the antenna, and $P_{R,max}$ is the power delivered to a load that is conjugate matched to the antenna impedance.

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