6. Radar antenna characteristics

6.1 General principle

It therefore ensures :

• adaptation between the "guided medium" or "waveguide" (in the general sense) and free space; when this adaptation is perfect, the transition is lossless, i.e. all the energy from the "guided medium" is radiated into space;

• the distribution of radiated energy in space, which reflects the relative importance of the radiation according to the direction considered, and is characterized by the antenna's radiation pattern.

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