Study on the electromagnetic properties of a coated radar absorbent

Abstract

The sol-gel method is used to fabricate Fe crystalline powders coated with SiO 2 . By controlling the molar ratio R of diluted water to tetraethoxysilane (TEOS), Fe powders coated with SiO 2 with different morphological characteristics are fabricated. The influence of the core diameter on electromagnetic parameters is investigated. The effect of the amount of the coating material SiO 2 on electromagnetic parameters is given. Radar wave absorbing properties of Fe coated with SiO 2 and TiO 2 respectively are compared.

Numerical simulation of the coupling of ultra-wide band electromagnetic pulse into landmine by aperture

“…As the electromagnetic wave radiation has many unique properties such as a steep rising front edge, high peak-value power, and wide frequency-spectrum range, such new concept weapons are thus capable of strong interference with, or even serious damage of, the electronic as well as electrical system. [1][2][3][4] Most modern mines have applied the electronic fuse technology, for instance, the proximity fuse and time delay fuse, and thus just for its precise and sophisticated structure, such a fuse is susceptible to UWB-EMP interference, under which the fuse either fails to perform its normal function, or turns spuriously detonated or even damaged. [5] Although such shells are made of metal, conductive plastic or other electromagnetic shielding materials that effectively improve the anti-interference capacity against the UWB-EMP, there are often apertures (or slits for manufacturing necessity) on landmine shells as formulated from the annectent devices, and through the aperture coupling operations, the UWB-EMP would easily impose a coupling effect upon the electronic fuse.…”

Fabrication and characterization of direct-written 3D TiO 2 woodpile electromagnetic bandgap structures

“…Woodpile structure with facecentered-tetragonal (FCT) symmetry is more likely to have a wide photonic band gap relative to the FCC, because symmetry is reduced. TiO 2 has many applications in solar cells, [7] photocatalytic activity, [8] radar absorbent coatings, [9] and onedimensional photonic crystals. [10] Until now, no 3D woodpile TiO 2 structure with electrical properties has been demonstrated.…”

Resonance suppression and electromagnetic shielding effectiveness improvement of an apertured rectangular cavity by using wall losses

“…Recently, there have been considerable concerns about the suppression of electromagnetic emission from electronic equipment and the improvement of equipment immunity. [1][2][3][4][5][6][7][8] One of the essential countermeasures for these purposes is electromagnetic shielding, which can be implemented by enclosing a piece of electronic equipment with a metallic enclosure. However, the shielding effectiveness (SE) of the enclosure can be reduced dramatically due to apertures that inevitably exist on the enclosure for some practical requirements like ventilation.…”

“…Although the apertures are primarily responsible for the reduction of SE, the cavity-mode resonance can result in significant degradation of the SE at some resonance frequencies of the enclosure. [5,6,8] The rapid development of high-speed electronics and the wide applications of wireless communication technologies require that an enclosure is frequently used in an electromagnetic environment with frequencies up to 1 GHz. For many practical enclosures, these frequencies are higher than their fundamental resonant frequencies.…”