3. Conclusion

In this article, we've taken a quick look at :

• radar operating principle ;

• frequencies used ;

• the power received by the radar as a function of the radar equivalent area of a target ;

• the principle of radar target SER ;

• an overview of microwave absorbing materials and the principles on which they were based;

• examples :

  • broadband absorbent and resonant materials,

  • hybrid materials,

  • active and passive frequency-selective surface absorber materials,

  • absorbent materials based on metamaterials and metasurfaces.