scholarly journals Analysis of Reflectivity and Shielding Effectiveness of Absorbing Material–Conductor Laminate for Electromagnetic Compatibility

2010 ◽  
Vol 02 (05) ◽  
pp. 318-323 ◽  
Author(s):  
Cheruku D. Raj ◽  
Gottapu S. Rao ◽  
Pappu V. Y. Jayasree ◽  
Budumuru Srinu ◽  
Pappula Lakshman
Keyword(s):  
Electromagnetic Compatibility ◽  
Shielding Effectiveness ◽  
Absorbing Material

scholarly journals Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

2013 ◽  
Vol 8-9 ◽  
pp. 353-360 ◽  
Author(s):  
Ştefan Ursache ◽  
Romeo Cristian Ciobanu ◽  
Vlad Scarlatache ◽  
Andrei Niagu
Keyword(s):  
Modeling And Simulation ◽  
Electromagnetic Compatibility ◽  
Electromagnetic Properties ◽  
Shielding Effectiveness ◽  
Absorption Mechanism ◽  
Dielectric Characteristics ◽  
Radar Absorbing Material ◽  
Conductive Nanocomposites ◽  
Absorbing Material ◽  
Composite Form

The paper highlights the most important dielectric features for some nanocomposites polymer matrix based on polypropylene (PP) with insertion of carbon nanotubes multi-walled (MWCNTs). The dielectric characteristics analyzed are the real permittivity and dielectric losses of the sample based on PP with 5% insertion of MWCNTs. The measurements are made in a range of frequency between 1 MHz to 3 GHz. The composite form was also analyzed through computer modeling and simulation and electromagnetic properties for EMC shielding applications are also considered. PP/MWCNTs composite with shielding effectiveness of 15-20 dB was investigated through modeling and simulation at about 5% MWCNTs filling. Shielding mechanism was estimated by calculating the total shielding effectiveness (SE) into absorption and reflection loss. PP/MWCNTs composite indicates a shielding mostly by absorption mechanism; therefore it also can be used in other microwave applications or like a radar absorbing material. The effect of MWCNTs affects the electrical conductivity of the nanocomposite. The proposed material shows some interesting electromagnetic compatibility (EMC) properties and promises better performance using different amounts of MWCNTs.

scholarly journals Conductive textile structures and their contribution to electromagnetic shielding effectiveness

2020 ◽  
Vol 71 (05) ◽  
pp. 432-437
Author(s):  
Ion Razvan Radulescu ◽  
Lilioara Surdu ◽  
Bogdana Mitu ◽  
Cristian Morari ◽  
Marian Costea ◽  
...  
Keyword(s):  
Electromagnetic Compatibility ◽  
Modern Technology ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Conductive Coatings ◽  
Tem Cell ◽  
Conductive Yarns ◽  
Conductive Textile ◽  
Electromagnetic Shielding Effectiveness

Fabrics for electromagnetic shielding are especially relevant in nowadays context, contributing to human’s protection and wellbeing and to proper functioning of electronic equipment, in relation to electromagnetic compatibility. Fabrics with electromagnetic shielding properties employ two main technologies, namely insertion of conductive yarns and application of conductive coatings. Magnetron sputtering is a modern technology to enable conductive coatings with thickness in the range of nanometers onto fabrics. This paper aims to analyze contribution of various conductive textile structures out of both fabrics with inserted conductive yarns and coatings to Electromagnetic shielding effectiveness (EMSE). EMSE was measured in the frequency range of 0.1–1000 MHz by using a TEM cell according to standard ASTM ES-07. Results show a gain of 10–25 dB when introducing silver yarns in warp/ weft direction, a variation of 5–35 dB between conductive yarns out of silver and stainless steel and an up to 12 dB gain out of thin copper coating by magnetron plasma onto the fabrics with inserted conductive yarns

scholarly journals Life Cycle Assessment of Flexible Electromagnetic Shields

2021 ◽  
Author(s):  
Ion Răzvan Rădulescu ◽  
Lilioara Surdu ◽  
Emilia Visileanu ◽  
Bogdana Mitu ◽  
Cristian Morari
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Electromagnetic Compatibility ◽  
Plasma Coating ◽  
Impedance Method ◽  
Shielding Effectiveness ◽  
Fabric Structure ◽  
Conductive Yarns ◽  
Set Up ◽  
Conductive Properties

Nowadays, fiber based flexible electromagnetic shields have widespread applications in ensuring Electromagnetic Compatibility (EMC). Shielding is a solution of EMC, and the main methods to estimate shielding effectiveness are represented by the circuit method and the impedance method. Magnetron sputtering of metallic layers represents a novel technique to impart electric conductive properties to fabrics. Coating of fabrics represents a second main option to manufacture textile shields beside the insertion of conductive yarns in the fabric structure. Life Cycle Assessment (LCA) is often used to assess a comparatively modern with a classical manufacturing process in order to prove its eco-friendly character. This chapter comparatively assesses flexible EM shields manufactured of fabrics with inserted conductive yarns with and without magnetron plasma coating. The copper plasma coating of cotton fabrics with inserted silver yarns increases shielding effectiveness (EMSE) by 8–10 dB. In order to keep for the LCA study the same functional unit of 50 dB at 100 MHz for one sqm of fabric, the fabric structure is modeled with a reduced distance between the inserted conductive yarns. Results of the LCA study show a substantial impact on the environment for the plasma coated fabric upon using a laboratory scale deposition set-up.

scholarly journals EM shielding effectiveness of Pd-CNT-Cu nanocomposite buckypaper

2015 ◽  
Vol 3 (26) ◽  
pp. 13986-13993 ◽  
Author(s):  
Anil Kumar ◽  
Avanish Pratap Singh ◽  
Saroj Kumari ◽  
A. K. Srivastava ◽  
Sivaiah Bathula ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Cu Nanoparticles ◽  
Shielding Effectiveness ◽  
Absorbing Material ◽  
Microwave Absorbing ◽  
Multiwall Carbon

We report the synthesis of a nanocomposite consisting of Pd doped multiwall carbon nanotubes decorated with Cu nanoparticles, as a lightweight and flexible microwave absorbing material, using an electroless technique.

scholarly journals Characteristic Analysis and Applications of Electromagnetic Shielding Materials for Wireless Communications Device

2016 ◽  
Vol 10 (1) ◽  
pp. 44-53
Author(s):  
Han-Nien Lin ◽  
Ya-Ying Chen ◽  
Hung-Yun Tsai ◽  
Min-Shan Lin
Keyword(s):  
Mobile Communications ◽  
Electromagnetic Interference ◽  
High Speed ◽  
Electromagnetic Compatibility ◽  
Electromagnetic Shielding ◽  
Consumer Electronics ◽  
Shielding Effectiveness ◽  
Characteristic Analysis ◽  
Measuring Methods ◽  
Iec 61967

As the trend of consumer electronics and mobile communications devices is obviously developing toward to miniature and high-speed processing, the problem involving with electromagnetic compatibility (EMC) or radio frequency interference (RFI) is becoming more critical for the system integration of high-speed digital and RF mixed signal platforms. This paper is mainly focusing on the characteristics analysis of various electromagnetic shielding materials by utilizing the various shielding effectiveness (SE) measuring methods developed by TDK and ASTM (ASTM D4935). We also adopt the electromagnetic interference (EMI) testing methods developed by IEC for chip level (IEC 61967-3 and IEC 61967-6) to investigate the characteristics and distribution of EMI noise sources. To effectively shield the electric, magnetic, or electromagnetic field originated from noise source, we thus analyze the shielding capability for various materials with different measuring methods. Finally, we will show the EMI reduction and RF performance improvement with implementation of shielding material on module under investigated. With the systematic measurement and analysis described in this paper, we can further identify the related EMI problem and resolve the severe chip or module level EMC problem more effectively.

Electromagnetic Compatibility Issues in Electric Vehicle Applications

2018 ◽  
Vol 915 ◽  
pp. 71-76
Author(s):  
Tatiana Damatopoulou ◽  
Vasilios Lazaris ◽  
Antonios Kladas ◽  
Athanasios G. Mamalis
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Electromagnetic Compatibility ◽  
Power Cables ◽  
Shielding Effectiveness ◽  
Vehicle Cabin ◽  
Frequency Magnetic Field ◽  
Exposure Levels ◽  
Cabin Environment ◽  
Electromagnetic Shielding Effectiveness

The paper develops analyses electromagnetic compatibility issues in electric vehicles. Particular techniques are developed involving special elements of tubular geometry based on the analytical solution of diffusion equation combined with standard finite elements, for analysis of electromagnetic shielding effectiveness in power cables due to power static converter operation. Particular simulations analyze the exposure levels due to variable frequency magnetic field on anatomically detailed human models in electric vehicle cabin environment. The results obtained have been compared to those found in the literature and to measured ones.

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