dB
dB decibels. Unit for measuring relative power ratios in terms of gain or loss. Units are expressed in terms of the logarithm to base 10 of a ratio and typically are expressed in watts. dB is not an absolute value, rather it is the measure of power lost or gained between two devices. For example, a -3dB loss indicates a 50% loss in power, a +3dB reading is a doubling of power. The rule of thumb to remember is that 10 dB indicates an increase (or a loss) by a factor of 10, 20 dB indicates an increase (or a loss) of a factor of 100, 30 dB indicates an increase (or a loss) by a factor of 1000. Because antennas and other RF devices/systems commonly have power gains or
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