Autori: I. Nicolaescu

Editorial: Vol 11 2009, p.728-735, 2009.

Rezumat:

Radar sensors are used for more and more applications from space surveillance, navigation, speed measurement, landmine detection, anticolision systems, space investigations etc. All these applications depend on the signal reflected from an object. The processing algorithms as well as the hardware available had been constantly improved such as today radars are able to detect objects with very small radar cross section (RCS). Nevertheless in the field of surveillance radar there is a lot of work in progress to improve the shape and to use low reflecting materials to decrease the power backscattered by the radar and, in this way, to diminish the probability of detection. The work presented in this paper regards tapered conductivity materials which can be used to decrease the radar cross section. The incident energy, or part of it, has to be transformed in heat within the material layer. To this end it has to have some lossy mechanisms. One possibility is to increase the conductivity. In the paper, the behavior of a material layer with certain electromagnetic parameters as a function of thickness, frequency, gradient conductivity and incidence angle is studied by computer simulations. This type of materials may be used for radar cross section reduction and to built anechoic chambers for measurements.

Cuvinte cheie: optoelectronics and new advanced materials: non-linear optical materials, optoelectronic devices, crystals of relevance in optoelectronics, amorphous and glassy materials, nanostructured materials and devices, polycrystalline and disordered materials, magnetic materials, functional and smart materials, new optical materials based on polymers