Single-layer type microwave absorber made of magnetic-dielectric composite material

Microwave absorber properties of magnetic and dielectric composite materials

“…As a result, good absorption characteristics are obtained above 4 GHz, where the superiority over ferrite becomes pronounced [22]. TiO 2 is stable physically and chemically, and its microwave absorption is not degraded when it is mixed with Fe; on the contrary, beneficial effects are obtained such as lighter weight and a higher frequency limit of microwave absorption due to the dielectric properties of TiO 2 [23]. The EPDM used as the matrix material is a loss-free resin which has good machinability combined with high resistance to oil, heat, UV light, water, and other environmental factors.…”

Microwave absorption properties of 50% SrFe12O19–50% TiO2 nanocomposites with porosity

“…The efficiency of magneticdielectric absorbers is high because the complex permittivity (e r ¼e 0 À je*) and permeability (m r ¼m 0 Àjm*) differ from zero [4]. A series of papers dealing with applications for the magnetic composites containing TiO 2 nanoparticles have been reported [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The main problem for designing a magnetic absorber is related to the choice of materials with good control over some magnetic and dielectric properties.…”

Nanoparticles-decorated coal tar pitch-based carbon foam with enhanced electromagnetic radiation absorption capability

“…Therefore, it is necessary to coat or decorate CFoam with magnetic/dielectric nanomaterials, so that CFoam can act as an excellent microwave-absorbing material with the requisite thermal stability and conductivity, in which microwaves can be absorbed due to the different interactive energy dissipation processes of polarization and magnetization. 21 With this aim, in the present investigation coal tar pitch-derived CFoams were developed by a sacricial template technique and heat-treated at 1000 C in an inert atmosphere. These foams were coated by a ferromagnetic ferrouid and dielectric zinc oxide (ZnO) nanoparticles to improve their radar emission absorption.…”

“…21 With this aim, in the present investigation coal tar pitch-derived CFoams were developed by a sacricial template technique and heat-treated at 1000 C in an inert atmosphere. These foams were coated by a ferromagnetic ferrouid and dielectric zinc oxide (ZnO) nanoparticles to improve their radar emission absorption.…”