Polymer composites of magnetic particles are widely used as microwave absorbers. An effective method for obtaining thinner microwave absorbers for device design is increasing the volume fraction of magnetic nanoparticles by enhancing the permeability of composites. In this study, composites were prepared using Ni-Zn ferrite nanoparticles surface-modified with 4-META (4-methacryloylioxyethyl trimellitate anhydride) and cross-linked with PEG-4SH (pentaerythritol tetra-polyethylene glycol ether with four thiol-modified terminals). These composites have a high volume fraction of nanoparticles (up to 72 vol%) and permeability (00 r max ¼ 5:9). In addition, the prepared composites showed good microwave absorption properties (R:L: < À20 dB) with a smaller matching thickness than conventional microwave absorber using spinel-type ferrite.
In this study, polymer composites containing amorphous FeB particles with large particle size distribution were fabricated. A polymer composite of mixed particles showed a high relative permeability of ® 0 r = 9.3 at 1 GHz. In addition, the composite exhibited good microwave absorption properties (R.L. < ¹20 dB) in the frequency range of 0.61.1 GHz for absorber thickness of 2.44.2 mm. Thus, this polymer composite can be used for fabricating microwave absorbers that are effect in the 0.71.0 GHz band, and would result in microwave absorbers thinner than any other microwave absorbers reported to date.
Polymer composites of magnetic particles are widely used as microwave absorbers. An effective method for obtaining thinner microwave absorbers for device mounting is to increase the volume fraction of magnetic nanoparticles within the composites such that the permeability is enhanced. In this study, composites were prepared using magnetite nanoparticles surface-modified with 4-META (4-methacryloylioxyethyl trimellitate anhydride) and cross-linked with PEG-4SH (pentaerythritol tetra-polyethylene glycol ether with four thiol-modified terminals). These composites have a higher volume fraction of nanoparticles (up to 62 vol%) and higher permeability than conventional epoxy resin composites. In addition, the prepared composites showed good microwave absorption properties (R:L: < À20 dB) with a smaller matching thickness (d ¼ 8:0 mm) than the epoxy resin composites (d ¼ 9:0 mm).
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