Figure 2

(a) Real part ε′, (b) imaginary part ε″ of the complex effective permittivity and (c) loss tangent (tan δ) of the effective complex permittivity of the produced composite samples. (d), (e): Stress-strain curve of the produced S-type and D-type composites. (f) Measured frequency spectrum of the reflection coefficient for 0°- and 90°-polarizations of the RAS obtained by layering 4 plies of composite D1 (having thickness of 1 mm) over an aluminium plate (2 mm in thickness).