Radiation Pattern

Radiation Pattern gives us a pictorial shape of how the energy radiation of an antenna looks like in the free space

The radiation pattern (RP) (or antenna pattern) is the representation of the radiation properties of the antenna as a function of space coordinates. The trace of the spatial variation of the received/radiated power at a constant radius from the antenna is called the power pattern.

The trace of the spatial variation of the electric (magnetic) field at a constant radius from the antenna is called the amplitude field pattern.

Usually, the pattern describes the normalized field (power) values with respect to the maximum value.

Note: The power pattern and the amplitude field pattern are the same when computed and plotted in dB.

In radiation patterns, there are two or more beams/lobes. The biggest of these beams/lobes is called the main beam/lobe, the rest, side beam/lobe.

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