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AMBITION
FunderFrench National Research Agency (ANR)
Funder Contribution €366,907.00
DurationFrom 01 Jan 2025
Project codeANR-24-ASTR-0018
Open Access mandatePublications: NoResearch data: No
Identifiers
Description
The Ambition project aims at the development of thin and flexible absorbing materials, foldable and conformable to small objects of non-planar shape. The objective is to propose a compact solution to reduce the reflection of electromagnetic (EM) waves on objects that can degrade the performances of communication systems (especially in dense environment and in presence of a multitude of signals at various frequencies) or to disturb the radar detection of vehicles or infrastructures; this solution could also improve the stealth of given carriers. The reflectivity reduction aims at covering a wide frequency band from 8 to 30 GHz. The considered applications cover a wide spectrum both in defense and civilian fields, that brings in addition to the EM absorbing performances mechanical, thermal and ageing specifications. The operating environments can be harsh and are described in the scientific file. The development of the composite materials considered in this study (in particular based on charged silicone foam) will be carried out taking into account from the first phases the constraints at which they will be exposed. The preservation of the performances when rolled or conformed around an object is one of the challenges of the project. Moreover, these materials will be structured on their outer faces with periodic or quasi-periodic patterns small in comparison to the wavelength, in order to increase the absorption performances (in terms of levels, bandwidth, angular sectors, etc.) and/or to scatter waves in non disturbing directions. Another challenge will be the optimization of the structured surface to reduce the specular and non-specular reflection of the impinging wave, because of the shape but also of the small size of the involved surface in comparison to planar or large surfaces. The EM, mechanical and thermal (in statics and in dynamics) properties of the materials will be characterized. The effect of ageing on these properties will be experimentally investigated. At last, the application of these materials integrated on demonstrative carriers will be carried out and the resulting RCS reduction will be measured over the frequency band 8 to 30 GHz. Beyond the developed materials within this project, the study aims at the definition of a methodology transposable to other frequency bands.
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The Ambition project aims at the development of thin and flexible absorbing materials, foldable and conformable to small objects of non-planar shape. The objective is to propose a compact solution to reduce the reflection of electromagnetic (EM) waves on objects that can degrade the performances of communication systems (especially in dense environment and in presence of a multitude of signals at various frequencies) or to disturb the radar detection of vehicles or infrastructures; this solution could also improve the stealth of given carriers. The reflectivity reduction aims at covering a wide frequency band from 8 to 30 GHz. The considered applications cover a wide spectrum both in defense and civilian fields, that brings in addition to the EM absorbing performances mechanical, thermal and ageing specifications. The operating environments can be harsh and are described in the scientific file. The development of the composite materials considered in this study (in particular based on charged silicone foam) will be carried out taking into account from the first phases the constraints at which they will be exposed. The preservation of the performances when rolled or conformed around an object is one of the challenges of the project. Moreover, these materials will be structured on their outer faces with periodic or quasi-periodic patterns small in comparison to the wavelength, in order to increase the absorption performances (in terms of levels, bandwidth, angular sectors, etc.) and/or to scatter waves in non disturbing directions. Another challenge will be the optimization of the structured surface to reduce the specular and non-specular reflection of the impinging wave, because of the shape but also of the small size of the involved surface in comparison to planar or large surfaces. The EM, mechanical and thermal (in statics and in dynamics) properties of the materials will be characterized. The effect of ageing on these properties will be experimentally investigated. At last, the application of these materials integrated on demonstrative carriers will be carried out and the resulting RCS reduction will be measured over the frequency band 8 to 30 GHz. Beyond the developed materials within this project, the study aims at the definition of a methodology transposable to other frequency bands.
