Action of external interference-carrying field on nonuniform multiwire shield

The shielding effect of multiwire meshes against an external interference--carrying field is calculated in terms of the attenuation coefficient A=20LOG absolute value of of 1/s, with s=square root of (p sub r, sh/p sub r, o), p sub r, sh and p sub r, o denoting the radial component of the Poynting vector with and without a shield, respectively. The shielding factor S is evaluated from the general solution to Maxwell differential equations, obtained according to the Bromvich method by superposition of two particular solutions (for transverse electric and magnetic waves, respectively). The shielding coefficient is found to depend not only on the shield structure but also on the form of the external electromagnetic field, namely on the ratio of its axial component to its tangential component. Accordingly, expressions are derived for flexible cylindrical single-layer and double-layer shields around cables, connecting wires, or cords.