Microwave Absorption Properties of Fe-Based Amorphous Particles Prepared Using Ball-Milling Method

GO-decorated chain-like Fe2O3/FeMn2O4 NPs (GO-Fe2O3/FeMn2O4 nanocomposites) with ultrabroad band microwave absorption

“…The trend of reflection loss of S3 is similar to that of S2 (RL was almost constant with a weak peak at the beginning of frequency), with a significant decrement in both reflection loss and bandwidth. Only for the 2.4 mm thick sample was the RL greater than À10 dB for the entire frequency band (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). The RL min reached À20 dB at 10 GHz and for the rest of the band, it was about À12.5 dB.…”

“…The results showed that electromagnetic interactions are enhanced by limiting the particle size to a value below the micrometer-scale. [4][5][6][7][8] The reduction of the EM waves mainly occurs via the impedance matching layers with air due to the permittivity and permeability values; however, dielectric loss often overcomes magnetic loss and therefore plays a more important role in the attenuation of EM waves. 9 Ideal absorber layers are lightweight and low-cost with stable electrical and magnetic properties, which lead to the stability in their EM parameters.…”

Metasurface-based electromagnetic structure for electromagnetic absorption and radiation application

“…3, the resistance of the lumped resistors is equal to 470Ω. The absorptivity of the absorber is calculated with 2 , where |S 21 | 2 ≃ 0 due to the shielding of the sandwiched copper's plate. Hence, the absorptivity can be rewritten as A = 1 − |S 11 | 2 .…”

“…In stealth technology, absorbing materials are primarily used to convert electromagnetic (EM) energy into other forms such as, heat or weaken them through interference cancellation that leads to RCS reduction. The conventional EM absorbers can be categorized into two types, i.e.absorbing material [1,2] and absorbing structures [3][4][5][6]. In the literature, many studies have been carried out to study the EM response of metamaterials (MMs) or metasurfaces (MSs) and their implementations in the area of sensing [7], cloaking [8], waveguide [9], absorber [3][4][5][6], reflection [10,11], polarization conversion [12][13][14] and checkerboard artificial magnetic conductor [15,16].…”

An Integrated Switchable EM Absorber and Beam Switchable Radiator

“…With the development of electronic technology for military applications, extensive research has been done to reduce the RCS of an antenna [14]- [20]. In [14], the RCS of the antenna was reduced by changing the shape of the radiator, wherein [15], the RCS of the antenna was reduced by loading the radar absorbing materials [15], [19]. Other methods includes, RCS reduction by EM band-gap (EBG) [16], frequency selective surfaces (FSS) [17], and polarization conversion metasurfaces [20].…”