Antenna gain is defined relative to which reference antenna?

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Multiple Choice

Antenna gain is defined relative to which reference antenna?

Explanation:
Antenna gain is defined relative to a hypothetical isotropic antenna, which radiates equally in all directions. This neutral reference lets us express how much the real antenna concentrates energy in a given direction. When gain is given as dBi, it’s decibels above isotropic. Real antennas like parabolic, dipole, or Yagi are described in relation to this baseline, or sometimes relative to a dipole (dBd), but the standard reference for gain is the isotropic antenna.

Antenna gain is defined relative to a hypothetical isotropic antenna, which radiates equally in all directions. This neutral reference lets us express how much the real antenna concentrates energy in a given direction. When gain is given as dBi, it’s decibels above isotropic. Real antennas like parabolic, dipole, or Yagi are described in relation to this baseline, or sometimes relative to a dipole (dBd), but the standard reference for gain is the isotropic antenna.

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