Nanocomposites for antenna-feeder systems

Abstract

The paper presents results of study of frequency dependence of permittivity and permeability of composite materials based on various polymer matrices and fillers in the form of nanoscale powders -nanoparticles of Si, carbon nanotubes, and magnetite nanoparticles. It is shown that, using the nanodisperse electrically conducting fillers, it is possible to obtain materials with the required dielectric permittivity, and in the case of magnetic nanoparticles to obtain materials with the appropriate magnetic properties.The results may be useful in the development of antenna-feeder systems that include elements that focus or absorb microwave radiation.

Superparamagnetic nano-biocomposites for application as dielectric resonator antennas

“…The BW of the DRA's was verified in À10 dB in the return loss graph, where it was observed that the variation of the content of magnetic nanoparticles did not cause any considerable alterations. The use of magnetite in nanocomposites for antenna-feeder systems is very desirable, once according to literature [49] magnetic nanoparticles allow to process materials with the suitable magnetic properties.…”

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

“…In this work, using a frequency range of 0.4-4.5 GHz, dipolar orientation is the predominant mechanism of dielectric polarization and the greatest reduction in ε values for BC-based composites suggests the lower mobility of the BC matrix in comparison to Ch and Col, as well as the dielectric relaxation process being related to the increase in tan δ values. Figure 6d shows the variation of ε at 4.45 GHz with SPIONs content (0, 30, 50 and 80% w/w) in the matrix, which showed the dielectric property increasing by SPION increments into composite films, as recorded by Bibikov et al (2013) [53]. Chemically, the resistive ceramic structure of Fe 3 O 4 @bPEI NPs positively contributes to higher ε values due to polar amine groups from bPEI molecules.…”