{"id":471,"date":"2018-08-22T14:10:36","date_gmt":"2018-08-22T17:10:36","guid":{"rendered":"http:\/\/pressreleases.scielo.org\/en\/?p=471"},"modified":"2023-03-29T14:06:32","modified_gmt":"2023-03-29T17:06:32","slug":"study-predicts-performance-of-materials-that-reduce-electromagnetic-interference-in-electronic-devices","status":"publish","type":"post","link":"https:\/\/pressreleases.scielo.org\/en\/2018\/08\/22\/study-predicts-performance-of-materials-that-reduce-electromagnetic-interference-in-electronic-devices\/","title":{"rendered":"Study predicts performance of materials that reduce electromagnetic interference in electronic devices"},"content":{"rendered":"

By Julliane Silveira, scientific journalist, S\u00e3o Jos\u00e9 dos Campos, SP, Brazil<\/strong>\"\"<\/a><\/p>\n

When radar absorbing materials (known under the acronym RAM) were first studied in the 1930s, researchers aimed to find materials that make some devices unnoticed by radars, when applied in targets. This technology is very useful in the manufacture of military vehicles, for instance, especially of aircraft. RAM are so named because they have properties that allow them to exchange the energy of the incident electromagnetic radiation by thermal energy (DIAS; MARTIN; REZENDE, 2012; WANG, et al<\/em>., 2017).<\/p>\n

Researchers could not imagine that such research would be useful in the 21st century, after the creation of many electrical and electronic devices such as mobile phones, radio transmitters, pacemakers and medical equipment (GAMA, REZENDE, DANTAS, 2011; DIAS; MARTIN; REZENDE, 2012).<\/p>\n

As it happens to radars, these devices use electromagnetic waves on the GHz range and may suffer interference from other electromagnetic sources, what can disturb their operation. That is why researches still deep into this subject to find additives \u2014 or the mixture of them \u2014 that can be applied in RAM production to reduce or neutralize the electromagnetic interference.<\/p>\n

This is the focus of the article “Performance Prediction of Microwave Absorbers Based on POMA \/ Carbon Black Composites in the Frequency Range of 8.2 to 20 GHz”, published in the vol. 10 of JATM (Journal of Aerospace Technology and Management<\/em>) by researchers from Instituto Tecnol\u00f3gico de Aeron\u00e1utica (ITA) and Instituto de Ci\u00eancia e Tecnologia (ICT) da Universidade Federal de S\u00e3o Paulo (Unifesp),<\/p>\n

The two researchers analyzed the behavior of poly(o-methoxyaniline) polymer, also known by the acronym POMA, and carbon black. POMA is a material used in studies involving thin films as corrosion protectors, catalysis, battery electrode materials, biosensors and sensors. Carbon black, however, are black particles based on carbon element and generally available in the form of a very fine powder. It is commonly used in the manufacture of tires and printer inks.<\/p>\n

“POMA and carbon black, when properly combined, result in a very efficient RAM. This absorber has the advantage over the magnetic based absorbers filled with ferrites and carbonyl iron, for example, to present lower density\u201d, says Simone Souza Pinto, lead author of the study.<\/p>\n

\"\"<\/a>

Fonte: PINTO; REZENDE, 2018.<\/p><\/div>\n

Figure 1 \u2013 Schematic of the wave-RAM interaction<\/strong><\/p>\n

The fact that they present lower density and high efficiency, as the article concludes, makes its production very relevant. “When the idea is to attenuate unwanted electromagnetic radiation without adding too much weight to the equipment, the use of these absorbers is a good option,” she explains.<\/p>\n

This means that these materials can be used in the equipment production, which are vulnerable to electromagnetic interference, such as cell phones, TV signal transmitters and satellites.<\/p>\n

The article further suggests the thicknesses more adequate for the studied materials, aiming increase the efficiency of RAM in the microwave attenuation. Research like this helps to increase the efficiency of devices without the need to increase their size or weight, which is crucial for new technologies, presented in ever smaller pieces.<\/p>\n

References<\/h3>\n

DIAS, J.C., MARTIN, I.M. and REZENDE, M.C. Reflectivity of Hybrid Microwave Absorbers Based on NiZn Ferrite and Carbon Black. J. Aerosp. Technol. Manag<\/em>. [online]. 2012, vol. 4, no. 3, pp. 267-274, ISSN: 1984-9648 [viewed 22 August 2018]. DOI: 10.5028\/jatm.2012.04032512<\/a>. Available from: http:\/\/ref.scielo.org\/jjkkmh<\/a><\/p>\n

GAMA, A.M., REZENDE, M.C. and DANTAS, C.C. Dependence of microwave absorption properties on ferrite volume fraction in MnZn ferrite\/rubber radar absorbing materials. Magn Magn Mater<\/em> [online]. 2011, no. 323, pp. 2782-2785, ISSN: 0304-8853 [viewed 22 August 2018]. DOI: 10.1016\/j.jmmm.2011.05.052<\/a>. Available from: https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0304885311003295<\/a><\/p>\n

WANG, C., et al<\/em>. Radar stealth and mechanical properties of a broadband radar absorbing structure. Compos Part B-Eng<\/em> [online]. 2017, vol. 123, pp. 19-27, ISSN: 1359-8368 [viewed 22 August 2018]. DOI: 10.1016\/j.compositesb.2017.05.005<\/a>. Available from: https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1359836816329407<\/a><\/p>\n

To read the article, access it<\/h3>\n

PINTO, S.S. and REZENDE, M.C. Performance Prediction of Microwave Absorbers Based on POMA\/Carbon Black Composites in the Frequency Range of 8.2 to 20 GHz. J. Aerosp. Technol. Manag<\/em>. [online]. 2018, vol. 10, e1618, ISSN: 1984-9648 [viewed 22 August 2018]. DOI: 10.5028\/jatm.v10.764<\/a>. Available from: http:\/\/ref.scielo.org\/8cn4vk<\/a><\/p>\n

External link<\/h3>\n

Journal of Aerospace Technology and Management \u2013 JATM: <http:\/\/www.scielo.br\/jatm<\/a>><\/p>\n","protected":false},"excerpt":{"rendered":"

Research indicates materials that attenuate electromagnetic interference in electronic devices and might be applied in its manufacture. The results were published by the research team from the Instituto Tecnol\u00f3gico de Aeron\u00e1utica (ITA) and Instituto de Ci\u00eancia e Tecnologia (ICT) da Universidade Federal de S\u00e3o Paulo (Unifesp), in the Journal of Aerospace Technology and Management<\/i>. …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":34,"featured_media":72,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[6,22,12],"tags":[193,23],"class_list":["post-471","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engineering","category-jatm","category-press-releases","tag-engineering","tag-journal-of-aerospace-technology-and-management"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/471","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/users\/34"}],"replies":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/comments?post=471"}],"version-history":[{"count":2,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/471\/revisions"}],"predecessor-version":[{"id":474,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/471\/revisions\/474"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/media\/72"}],"wp:attachment":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/media?parent=471"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/categories?post=471"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/tags?post=471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}