dbi to dbm conversion
dBi or dB(isotropic) is the forward gain of an antenna compared to the hypothetical isotropic antenna, which uniformly distributes energy in all directions.
dBm or dB(mW) is the power relative to 1 milliwatt.
Therefore, are two different quantities. You have to calculate the hypothetical power trasmitted from an isotropic antenna in your situation and then you have to compare to the power trasmitted, in the same situation, from your real antenna. This ratio (in dB), power trasmitted (real antenna)/power trasmitted (isotropic antenna), is dBi of your antenna.
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