New Approach to Designing Functional Materials for Stealth Technology: Radar Experiment with Bilayer Absorbers and Optimization of the Reflection Loss

Microwave power absorption by a two-layer system deposited on a metallic surface is studied in the experimental setup emulating the response to a radar signal. Layers containing hexaferrite and iron powder in a dried paint of thickness under 1 mm are used. The data is analyzed within a theoretical model derived for a bilayer system from the transmission line theory. A good agreement between experimental and theoretical results is found. The advantage of using a bilayer system over a single-layer system is demonstrated. How the maximum microwave absorption (minimum reflection) can be achieved through the optimization of the filling factors and thicknesses of the two layers is shown. This work reports experimental and modeling results of single and bi-layered systems with microwave-absorbing properties. Layers containing hexaferrite and iron powder in paint are prepared and measured under real radar conditions in an anechoic chamber. The data is analyzed within a theoretical model derived for a bilayer system from the transmission line theory with very good agreement.image