Omni-Directional Selective Shielding Multilayered Material for High Frequency Radiation

The selective microwave absorption properties of individual and multiple CoFe-glass coated amorphous microwires (GCAW) with small negative value of magnetostriction
$(\lambda\sim-1\times 10^{-7})$
, positioned in various configurations are investigated. The deep minimum in the transmission spectra correspond to the first antenna resonance for each length of the individual microwire indicating a selective stop filter behavior. A new type of shielding material in the shape of a multilayered material based on CoFe-GCAW with desired shielding effectiveness and selective absorption of the microwave frequency range by controlling the number of the layers and the length of microwires is proposed and the omni-directional selective shielding properties in the microwave frequency range are determinated. The shielding effectiveness measurements results were
${\rm SE}=4\ {\rm dB}$
to 9.5 dB for the samples with two layers,
${\rm SE}=18\ {\rm dB}$
to 33 dB for sample with 14 layers, and
${\rm SE}=36\ {\rm dB}$
to 48 dB for sample with 28 layers, respectively.