Analysis of Shielding Effectiveness of Single, Double and Laminated Shields for Oblique Incidence of Em Waves

Abstract

Abstract-Shielding prevents coupling of undesired radiated electromagnetic energy into equipment otherwise susceptible to it. In view of this, some studies on shielding effectiveness of different shields against angle of incidence with conductors and conductive polymers using plane-wave theory are carried out in this paper. The plane wave shielding effectiveness of new combination of these materials is evaluated as a function of angle of incidence for Single, Double and Laminated Shields. Conductivity of the polymers, measured in previous investigations by the cavity perturbation technique, is used to compute the overall reflection and transmission coefficients of single and multiple layers of the polymers. With recent advancements in synthesizing stable highly conductive polymers, these light-weight mechanically strong materials appear to be viable alternatives to metals for EM1 shielding. The analysis is done at a particular frequency for all three types of shields.

A New Computation of Shielding Effectiveness of Electromagnetic Radiation Shielding Fabric

“…Observing above results from Figures 4-6, it is noted that the computation value almost coincides with the experimental value in the linear increasing region. It is concluded that the SE of BESF can be calculated by Equation (6). We further change the experimental frequency from 1 GHz to 3.5 GHz, the results is consistent with that of Figures 4-6. …”

“…Assuming the number of samples is N , the SE S i of the ith sample is calculated by Equation (6). The SE Se i of the ith sample is obtained from experiments.…”

“…Until recently the studies on the shielding fabric have mainly focused on model construction of the BESF [3,4], performance of the BESF [5,6], testing of the BESF [7], and shielding fiber [8]. We still possess poor information about the SE computation of BESF.…”

Electromagnetic Shielding Features in Lightweight PVDF-Aluminum Based Nanocomposites

“…In this way, polymer-based carbon-filled composites [14], or a sandwich of conductive polymer between a conductor and microwave absorber (i.e., Ca-NiTi hexa ferrite, carbonyl-iron particles, barium ferrites, MnZn ferrite) [15] can be used for wideband microwave shielding structures. Other laminated shields are considered as the combination of several layers constructed using conductive polymer, i.e., polyacetylene and poly-p-phenylenebenzobis-thiazole (PBT), doped with iodine, and conducting materials like copper and aluminum [16]. The protection of a sensitive carsize system against electromagnetic waves have been proposed using a shielding cover composed of a 4 layer stuff, aluminum, polyethylene, aluminum and polyester [17].…”

Computation Model of Shielding Effectiveness of Symmetric Partial for Anti-Electromagnetic Radiation Garment

“…We have described the framework of the SE computation of the garment. In addition, a number of studies focus on the EMS fabric and textile products, such as model construction of blended EMS fabric [8,9], performance analyses of blended EMS fabric [10,11], computation of blended EMS fabric [12,13], and influence factors analyses of blended EMS fabric [14,15]. Sufficient information about the SE of products in other fields can be found in literature [16][17][18][19].…”