Electromagnetic shielding properties of spherical polyhedral structures generated by conducting wires and metallic surfaces

The shielding performance of new spherical polyhedral structures illuminated by an electromagnetic plane wave is investigated. The spherical shield screens consist of a juxtaposition of wire conductors and metallic screens distributed according to the regular pattern of a spherical polyhedron. It is shown that at low frequency, the wire frame screen provides high levels of shielding effectiveness, while its counterpart of metallic surfaces has a similar behavior for higher frequency bands. Moreover, the shielding characteristics of a combined wire-surface spherical surface are reported and compared with the cases of a single screen of wire conductors or metallic surfaces. The reported numerical results illustrate the advantage of using the combined configuration. It is observed that the combined wire-surface spherical screen can be designed in order to be effective simultaneously against interference at the low and high frequency limits for any polarization of the incident field.