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radiation resistanceA ficticious resistance in which the power radiated away from or collected by an antenna is considered to be dissipated. For a perfect antenna made of superconducting material, the ohmic losses (power dissipation arising from resistance) in the elements themselves are zero; the resistive part of the impedance presented at the feed point is then equal to the radiation resistance. In any practical antenna the ohmic losses are kept as small as possible in comparison to the radiated power. Maximum power transfer between transmitter or receiver and the antenna is effected when the feeder has a characteristic impedance equal to the radiation resistance.
radiation resistance[‚rād·ē′ā·shən ri‚zis·təns]
For a medium, the acoustic impedance of a plane wave in that medium. Also known as radiation impedance.
The total radiated power of an antenna divided by the square of the effective antenna current measured at the point where power is supplied to the antenna.