Nanocrystalline ferromagnetic microwires silicone flexible composite with optical transparency

Abstract

Novel flexible transparent composite sheets were fabricated with glass-coated nanocrystalline ferromagnetic microwires and transparent silicone matrix. The free-space method was employed to measure the effective permittivity and shielding effectiveness (SE) of samples fabricated from 4 to 20 GHz. SE of the transparent shielding layer with 1wt of microwires and thickness of 0.85 mm can be more than 20 dB when frequency is above 11 GHz. Due to resonance phenomena of the embedded shortcut microwires with a length of about 5 mm, both dielectric permittivity and loss of the composite are quite high at microwave frequency. Hence, such transparent composite sheets may also find applications in microwave applications © 2006 IEEE.