Modelling of polyaniline for Wi-Fi Electromagnetic Interference shielding

Al-Shabib, Whamid; Lachowicz, Stefan

doi:10.1109/icmsao.2013.6552654

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Shielding for more complex materials (e.g., composites) have been reported. 18,31–37 However, these researchers focus only on organized filler structures or multilayer systems.…”

Section: Introductionmentioning

confidence: 99%

Fiber reinforced thermoplastics compounds for electromagnetic interference shielding applications

Martins

Pontes

2021

Journal of Reinforced Plastics and Composites

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Market demands for lightweight and lower cost products drive manufacturers to improve current product portfolios. In the case of electronic devices, the most significant weight originates from the enclosure, traditionally in steel or aluminum, that ensures excellent mechanical and electromagnetic shielding performance. The use of thermoplastics filled with electrically conductive fibers, such as carbon or stainless steel, was investigated as a lightweight and cost-effective alternative to steel sheet for creating electromagnetic interference (EMI) shielding enclosures for electronic devices. This paper presents an EMI shielding analysis workflow for the development of plastic enclosures for an electronic device. The workflow starts by measuring the fiber-reinforced thermoplastic compounds shielding effectiveness (SE) with an experimental method in the 30 MHz–3 GHz frequency band. This analysis helps to filter a vast list of materials with a wide range of shielding performance, 20–100 dB, and allows to obtain empirical data for the second phase of the workflow, computer simulations. Simulations with experimentally adjusted material properties were used to validate the design concept of an enclosure in its early development phase. Results from this study showed that the selected material has better EMI SE performance than a steel sheet venting grid.

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“…Shielding for more complex materials (e.g., composites) have been reported. 18,31–37 However, these researchers focus only on organized filler structures or multilayer systems.…”

Section: Introductionmentioning

confidence: 99%

Fiber reinforced thermoplastics compounds for electromagnetic interference shielding applications

Martins

Pontes

2021

Journal of Reinforced Plastics and Composites

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“…Fortunately, the progress in material engineering brings the new solution for developers on how to protect the sensitive device. This solution represents intrinsically conducting polymers (ICPs) [2] such as Poly(p-phenylene vinylene), Polyaniline (PANI), polyE-al-polyE or polyE-cu-polyE [3], [4], [5]. Despite these significant scientific successes, electromagnetic interference is a problem in protecting transparent surfaces.…”

Section: Introductionmentioning

confidence: 99%

Shielding Effectiveness of Liquid Electrolyte

Kovář

Pospisilik

Valouch

et al. 2019

2019 Photonics &Amp; Electromagnetics Research Symposium - Fall (PIERS - Fall)

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The paper aims at the investigation of a liquid electrolyte effect on electromagnetic radiation. The liquid electrolyte could represent an interesting solution against electromagnetic interference for devices using transparent covers, such as security cameras. Currently, the way how to protect transparent areas is a fine metallic grid or polymer material; however, this solution could reduce the transparency through the protected part. The paper describes different types of electrolytes and compares their shielding effectiveness. The experiment includes a plastic packing, metallic electrodes, liquids, laboratory power supply, a coaxial transmission line with receiving and transmitting conductors, source of electromagnetic radiation, and test receiver. The liquid consists of weak and strong acids and bases, such as acetic acid, sulfuric acid or sodium chloride which have different conductivity. There are also various materials for electrodes affecting the conductivity and consequently, the ability of the electrolyte to eliminate the effects of electromagnetic interference. The kind of electrode affects the amount of received and delivered ions between anode and cathode. Shielding effectiveness of electrolyte depends on more unstable parameters compared to conventional metal materials. Temperature and concentration of solution affect the electrolyte conductivity; thereby, the reproducibility could be problematic. Strong electrolytes initially have a rapid increase in conductivity; however, high amounts of ions cause their interaction and decrease in conductivity. Weak electrolytes have a similar course, but the conductivity achieves many times lower values. Measurement is provided according to the ASTM D4935 methods, and it involves a discontinued inner and flanged outer conductor. Samples and the conductors are isolated from external sources of electromagnetic interference by special absorbent materials. The conclusion describes the contribution of the paper.

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