  The authors measured the transport properties of single-walled carbon
nanotube (SWCNT) films in the microwave frequency range from 10 MHz to 30 GHz
by using the Corbino reflection technique from temperatures of 20-400 K. Based
on the real and imaginary parts of the microwave conductivity, they calculated
the shielding effectiveness for various film thicknesses. Shielding
effectiveness of 43 dB at 10 MHz and 28 dB at 10 GHz are found for films with
90% optical transmittance, which suggests that SWCNT films are promising as a
type of transparent microwave shielding material. By combining their data with
those from the literature, the conductivity of SWCNT films was established in a
broad frequency range from dc to visible.
