DBi

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dBi (Decibel Isotropic) is a measurement of focus that an antenna has compared to a mathematically ideal isotropic antenna which has a uniform focus in all directions.

[edit] Simplified dBi Formulas

dBi = 10log [9.9 * (D/λ) 2]

D = Diameter of the antenna in meters λ = Wavelength in meters

To convert from dBd (Decibel Dipole) to dBi add 2.15.

[edit] See also

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