A novel transparent Co0.2Fe2.8O4@SiO2-polyetheretherketone hybrid material is prepared for electromagnetic interference shielding via in situ sol-gel process. 20% amino-functionalized polyetheretherketone (AFPEEK), containing trifluoromethyl units with excellent solubility is designed and synthesized to improve the stability and mechanical properties of Co0.2Fe2.8O4@SiO2 nanoparticles. The hydr...

To investigate the electromagnetic interaction of molecules inside the nanotubes, first, the structure of nanotubes B16N16 was optimized with hybrid density functional theory (B3LYP) using the EPR-II basis set, then Cu, Cu+, Cu++ were located in nanotube and we studied the total energy, band gap energy, electrical potential, changes of band gap energy in terms of total energy and dipole moment ...

Electromagnetic designs are found in a wide variety of industrial and R&D applications: cables, magnetic shielding, transmission lines, high voltage systems, and other EM systems. Engineers need to understand the electromagnetic behaviors (e.g. fields, forces, eddy currents, etc.) of these designs so that costs and performance can be effectively managed. In the past, engineers were limited to c...

A novel wearable Frequency Selective Surface (FSS) created using fabric materials capable of blocking electromagnetic radiation around the frequency 10.64 GHz (X Microwave band) is presented in this paper. Two different unit cell shapes are tested: embroidered metal yarn squares and hexagons. cotton with permittivity 1.9 thickness 0.4 mm used as a substrate. The proposed design validated by com...

In this paper, a novel method to design Quad-band stop frequency selective surface (FSS) is proposed shield medical/non-medical devices from electromagnetic radiation of wifi/Bluetooth, GPS,1G, 2G, 3G, 4G and 5G frequencies. The device can also be used in security surveillance protect them attack. FSS unit cell consists convoluted structures on FR4 substrate. study was performed by designing in...

In this work the electromagnetic modeling activities of the Electromagnetics and Matter Research Group (GEM) at the Technical University of Cartagena are reviewed. In particular, waveguide inverse permittivity measurement techniques, neural network devices modeling and efficiency and electric field uniformity achievement for multimode ovens by using dielectric moulds are reviewed. Additionally,...

Basic principles of reducing exposure to electromagnetic fields are reviewed in this article. Measures to reduce exposure can be divided into organisational/administrative and technical/engineering actions. Both strategies are briefly analysed and the basic principles of the theory of shielding are presented. A definition of shielding effectiveness (SE) is given, and the results from the genera...