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Development of Advanced Composite Radar-Absorbent and Screening Ordered Magnetic Based Materials and Coatings

Разработка перспективных композиционных радиопоглощающих и экранирующих материалов и покрытий на основе упорядоченных магнетиков
Development of Advanced Composite Radar-Absorbent and Screening Ordered Magnetic Based Materials and Coatings. Solution of tasks to meet safety requirements for human beings and the environment, to secure information from radio channal leakage, to minimize radar signature of objects, to outfit room for radioelectronic devices electromagnetic compliance study, etc , mainly depend on development and application of materials which reflect and absorb electromagnetic waves energy in a wide range of frequencies. Specifically, one of the tasks for the engineers of advanced radio equipment is to lower the electromagnetic waves reflection level in subgigahertz friquency range at normal incidence on the surface of the absorbing material compared to perfect reflecting surface by 15-20 dB with the coating of 5-10mm. The current scientific concept is that absorbtion of electromagnetic energy is determined by relaxation process. Given that, the most efficient radioactivity absorber shall possess both dielectric and magnetic losses. Maximum electromagnetic energy absorbtion is corellated with domain-wall resonance, natural ferromagnetic resonance, ferromagnetic resonance, dielectric resonance and interferation process at coating boundaries. In the framework of the research the Technology of Electronic Materials Department investigates fundamental and technological principals for developing new generation composite materials and coatings featuring dielectric matrixes with conducting and semiconducting magnetic impures, actively interfrerating with with radio propagation in high and miscrowave frequencies. Research in thie field is done in collaboration with Meta-Ferrite company (Novokuznetzk) and State university of Penza, supported by state orders and RFBR grants. The aim of the project is to develop an effective model of the environment decribing its interaction with radio propagation and accounting for electromagnetic energy relaxation processes in composite materials and coatings ( including micro- and nanostructured) as their inner structure fuctions, magnetic and dielectric properties given various loss mechanisms. In the long run it will enable to formulate requirements to microstructure, chemical, grane metric and phase compostion of the materials with targeted properties. Based on theoretical and experimental research results, the task is set to obtain prototypes of ultra-wideband elecromagnetic wave absorbers with high level of electromagnetic propogation absorbtion ( power reflection coefficient between -15 and -40dB) in frequency range between 1MHz and 15 GHz. The project envisages the development of mono- and multylayer flixible temperature resistant material based on an original approch to composite formation with the use of modified particles of magnetic materials. The use of polydisperse forms of carbon, ferrites and metals along with nanostructuring and poly-conjugated systems will substatially improve physical parameters of the new materials and gain control over frequency parameter of complex dielectric inductivity. The plan is to study properties and application possibilities of the obtained radar-absorbent materials and coatings in various fields. The project will lay a scientific groundwork for production of home-made wide-band radar absorbent composite materials and ferrite based coatings which will be more competitive than foreign prototype giveb better weight and dimensional characteristics. Achieved results: 1. Composition developed and prototypes obtaines of radar absorbent ferrites. 2. Ultra-wideband absorber of electromagnetic waves for anechoic and screened chamber developed and obtained. 3. Anechoic chamber developed. 4. A method for obtaining radar-absorbing magnesium-zinc ferrite developed.

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