On the Antenna Gain Formula
Alade Olusope Michael

Abstract
Two formulas were derived for estimation of antenna gain. The first formula is derived based on the method of gain in the field intensity of the array antenna. The second is derived based on the existing gain-comparison method. The two formulas were used to compute the gain of a two rectangular folded array antenna, as an example, and using the /2 antenna as the reference isotropic antenna. The computation results were compared with the experimental measurements. The normalized root-mean-square errors of 0.52% and 0.3% were obtained with the first and second formulas respectively. The two methods can be used to determine the gain of antennas.

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