What is Radiation Efficiency of an Antenna?

Radiation efficiency is another important parameter to describe how efficiently an antenna transmits and receives RF signals, which is defined as the ratio of the total power radiated by an antenna to the total input power received from the generator.

An antenna with high radiation efficiency efficiently radiates the input power to free space.

In the case of low radiation efficiency, the input power is mostly dissipated because of the internal losses such as metal conduction, dielectric and magnetic losses within the antenna.

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