Nanocrystalline Ferromagnetic Microwires Silicone Flexible Composite With Optical Transparency

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 1 wt% 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.