The usage of electrical and electronic devices that operate at high frequencies has grown rapidly in recent years, as well as the increased perception and awareness of new possible electromagnetic interference threats to equipment and people. In addition, it is worthy of notice that in many countries there exist several mandatory regulations and standards that regulate emissions and immunity of equipment and exposition of personnel and people to electromagnetic fields. Therefore, there is an increasing need of materials capable to adequately shield incident electromagnetic fields. Traditional shielding materials such as homogeneous metals have indeed suitable properties as regards the shielding effectiveness (SE); however, their use is mainly limited by weight and cost. Alternative materials such as conductive polymer composites have been developed and proposed to replace metals in many applications, e.g., enclosures for the electrical and electronic industry, due to their rather good performances in terms of shielding effectiveness and electrostatic discharge. Nevertheless, other applications may be difficult because of their rigidity. Conductive textiles represent indeed an interesting development of what has been done with fabrics in the last two decades to convert them into electromagnetic shields. Due to their flexibility and conformability, fabrics with reasonable electrical and magnetic properties are attractive for various applications, from electromagnetic shielding to electrostatic discharge, and can be used in civil, commercial and military environments. As there is no precise method for calculating the SE of these materials, testing remains the preferable option. In particular, this paper is devoted to investigate which basic mechanisms are responsible for the major part of the shielding of conductive textiles by means of measurement of the shielding effectiveness. Both woven and nonwoven textiles are examined and the results for textiles of different thickness, nickel amount and fabric geometry are compared.
Investigation on the Shielding Effectiveness Properties of Electrically Conductive Textiles / L. Sandrolini; U. Reggiani. - ELETTRONICO. - (2008), pp. 1-4. (Intervento presentato al convegno 2008 Asia Pacific Microwave Conference (APMC) tenutosi a Hong Kong and Macau, China nel Dec. 16-20, 2008) [10.1109/APMC.2008.4958135].
Investigation on the Shielding Effectiveness Properties of Electrically Conductive Textiles
SANDROLINI, LEONARDO;REGGIANI, UGO
2008
Abstract
The usage of electrical and electronic devices that operate at high frequencies has grown rapidly in recent years, as well as the increased perception and awareness of new possible electromagnetic interference threats to equipment and people. In addition, it is worthy of notice that in many countries there exist several mandatory regulations and standards that regulate emissions and immunity of equipment and exposition of personnel and people to electromagnetic fields. Therefore, there is an increasing need of materials capable to adequately shield incident electromagnetic fields. Traditional shielding materials such as homogeneous metals have indeed suitable properties as regards the shielding effectiveness (SE); however, their use is mainly limited by weight and cost. Alternative materials such as conductive polymer composites have been developed and proposed to replace metals in many applications, e.g., enclosures for the electrical and electronic industry, due to their rather good performances in terms of shielding effectiveness and electrostatic discharge. Nevertheless, other applications may be difficult because of their rigidity. Conductive textiles represent indeed an interesting development of what has been done with fabrics in the last two decades to convert them into electromagnetic shields. Due to their flexibility and conformability, fabrics with reasonable electrical and magnetic properties are attractive for various applications, from electromagnetic shielding to electrostatic discharge, and can be used in civil, commercial and military environments. As there is no precise method for calculating the SE of these materials, testing remains the preferable option. In particular, this paper is devoted to investigate which basic mechanisms are responsible for the major part of the shielding of conductive textiles by means of measurement of the shielding effectiveness. Both woven and nonwoven textiles are examined and the results for textiles of different thickness, nickel amount and fabric geometry are compared.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
