EMI Shielding Fundamentals

Aswathi, M. K.; Rane, Ajay Vasudeo; Thomas, Sabu; Jaroszewski, Maciej

doi:10.1002/9781119128625.ch1

Cited by 28 publications

(15 citation statements)

References 18 publications

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“…If the value of SE is higher than 10 dB, shielding by multiple reflections can be ignored. Relevant equations are summarized using S parameters: , As for the MZ sample, the values of SE are all lower than 5 dB, which is not appropriate for commercial application (20 dB) . However, after the annealing process, the SE value of MZ800 gradually increases from 11.44 to 31.13 dB during the testing frequency range (Figure S7).…”

Section: Results and Discussionmentioning

confidence: 99%

Multifunctional Bulk Hybrid Foam for Infrared Stealth, Thermal Insulation, and Microwave Absorption

Tan

Chen

et al. 2020

ACS Appl. Mater. Interfaces

247

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Taking serious microwave pollution issues and the complex application environment into consideration, it is quite urgent to integrate several functions into one material. Electromagnetic (EM) absorbing materials with multiple functions are highly attractive to next-generation wireless techniques and portable electronic devices. Herein, melamine foam provides a decent platform for the uniform growth of Co-based metal− organic frameworks (MOFs), which bring the as-obtained hybrid foam with threedimensional porous network structure and combination of dielectric along with magnetic attenuation abilities as advanced materials in multifunctional fields. Remarkably, the relevant microwave absorption (MA) performance of the hybrid foam can reach an extremely high reflection loss value of −59.82 dB. Furthermore, the hybrid foam exhibits excellent infrared stealth and optimiztic heat insulation function, demonstrating the potential in plenty of practical applications. These results may arouse interests and inspirations of the elaborately design and facilely synthesis of highperformance foamlike microwave absorbers with multiple functions.

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Section: Results and Discussionmentioning

confidence: 99%

Multifunctional Bulk Hybrid Foam for Infrared Stealth, Thermal Insulation, and Microwave Absorption

Tan

Chen

et al. 2020

ACS Appl. Mater. Interfaces

247

View full text Add to dashboard Cite

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“…As the comparison of CPI-planar and 3D microstructured CPI, 3D-CPI obviously impacts the secondary and the third mechanisms for the EMI shielding. [55][56][57] Therefore, a 3D microstructured CPI FSS structure has a high potential to be used as an EMI shielding material owing to the main mechanisms of shielding properties.…”

Section: Resultsmentioning

confidence: 99%

3D Microstructured Frequency Selective Surface Based on Carbonized Polyimide Films for Terahertz Applications

Hlaing

Karthikeyan

et al. 2022

Advanced Optical Materials

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In recent years, frequency selective surface (FSS)‐based two‐dimensional (2D) and three‐dimensional (3D) carbon materials such as carbon nanofibers, carbon nanotubes, and carbon‐filled filaments are essential tools to design millimeter‐wave radomes, absorbers, electromagnetic interference (EMI) shielding, and antenna reflectors in gigahertz (GHz) regimes. Terahertz (THz) technologies are gaining attentions from medical imaging to security surveillance. In this work, a 3D microstructured FSS using carbon‐based polyimide as a precursor to enhance the resonant frequency at the THz range. Furthermore, gold nanoparticles (AuNPs) are embedded on 3D microsturctured carbonized polyimide (3D‐CPI) film to improve their FSS property through plasmonic effects. From the time domain spectroscopy measurements, 3D‐CPI FSS film shows band‐stop filter properties in the frequency range of 0.5–1.5 THz and with a maximum return loss (RL) of 40.5 dB (at the resonant frequency of 1 THz). The 3D‐CPI/AuNPs film demonstrates the highest RL of 43.7 dB at the higher excitation resonance frequency ≈1.06 THz due to the interaction of plasmonic electrons with scattered delocalized electrons in carbon, which induces the mechanisms for EMI shielding. The results will open insight into 3D plasmonic carbon microstructures as an EMI shielding material at THz frequency.

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“…So, from this, we can justify that the shielding effectiveness of multiple reflections mainly depends on the thickness and depth of the material and are closely related to the absorption mechanism. Therefore, multiple reflections are essential in porous structures and some solid geometries 34,50–52 …”

Section: Working Mechanism Of Electromagnetic Shieldingmentioning

confidence: 99%

Polyvinylidene fluoride—An advanced smart polymer for electromagnetic interference shielding applications—A novel review

Nivedhitha

Jeyanthi²

2023

Polymers for Advanced Techs

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Emerging technology and modernization have become a worldwide threat to human life in all aspects. Worldwide, all countries are in the race to develop the most advanced electronic devices and gadgets as they reflect the country's superiority and economic development. Specialists have forecasted that during and after the pandemic, the addiction toward modern gadgets have increased by 40% among the people irrespective of age. A few researchers have reported that the world economy is dependent on and dominated by countries manufacturing semiconductors, mobiles, electronic chips, and so on. People started sensing that modern devices are like a boon, as their lives seem to be more connected and comfortable with all their needs and wants being fulfilled at their doorsteps. But this boon is slowly whirling as a severe threat to human lives. Due to this rapid usage of electronic devices, electromagnetic interference (EMI) is drastically growing, which is considered a global warning issue for commercial and biological systems. So advanced countries have decided to make EMI shielding a compulsory entity to be implemented in all advanced electronic devices. Though traditional materials like metals and carbon allotropes have excellent shielding properties, they cannot cope with today's mass production of modern devices. Thus, researchers had to find a suitable substitute material that should possess properties such as sustainability and biocompatibility to overcome problems faced by the conventional materials. Thus, polymers have come into the world of EMI shielding applications. Polyvinylidene fluoride (PVDF), a non‐conductive polymer from the family of Fluorocarbons, is creating history in the field of EMI shielding applications. PVDF astonished researchers with its versatile features, such as light weight, flexibility, and easy processibility with excellent dielectric and piezoelectric properties. Though they are poor in electrically conductive properties, incorporating metals, carbon allotropes, and metal oxides as fillers make them superior to the existing conventional materials. Thus, the main objective of this review article is to highlight the uniqueness of PVDF as an advanced polymer for EMI shielding applications. It has been noted that PVDF is more suitable for EMI shielding in X, K, and Ku band frequencies. But overall, we noticed that the performance of PVDF has a great impact by incorporating a combination of metal and carbon allotrope enhances the shielding effectiveness up to 65 dB in the Ku‐band (Kurz‐under) frequency band range of (12–18 GHz).

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EMI Shielding Fundamentals

Cited by 28 publications

References 18 publications

Multifunctional Bulk Hybrid Foam for Infrared Stealth, Thermal Insulation, and Microwave Absorption

Multifunctional Bulk Hybrid Foam for Infrared Stealth, Thermal Insulation, and Microwave Absorption

3D Microstructured Frequency Selective Surface Based on Carbonized Polyimide Films for Terahertz Applications

Polyvinylidene fluoride—An advanced smart polymer for electromagnetic interference shielding applications—A novel review

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