What is meant by the term radiation resistance of an antenna?

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Multiple Choice

What is meant by the term radiation resistance of an antenna?

Radiation resistance is the part of an antenna’s input impedance that represents the power actually radiated as electromagnetic waves. It’s an equivalent resistance: if the antenna were replaced by a resistor of the same value and driven by the same current, that resistor would dissipate the same amount of power as the antenna radiates. In practice, the total input impedance has a real part and a reactive part; the real part includes radiation resistance plus any ohmic losses, while the imaginary part stores energy. This distinction matters because the radiation resistance specifically accounts for energy leaving as radiation, not the losses in the conductors or feed line or the reactive energy that temporarily stores energy.

Radiation resistance is the part of an antenna’s input impedance that represents the power actually radiated as electromagnetic waves. It’s an equivalent resistance: if the antenna were replaced by a resistor of the same value and driven by the same current, that resistor would dissipate the same amount of power as the antenna radiates. In practice, the total input impedance has a real part and a reactive part; the real part includes radiation resistance plus any ohmic losses, while the imaginary part stores energy. This distinction matters because the radiation resistance specifically accounts for energy leaving as radiation, not the losses in the conductors or feed line or the reactive energy that temporarily stores energy.

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