Cobalt-polymer nanocomposite dielectrics for miniaturized antennas Article

Raj, PM, Sharma, H, Reddy, GP et al. (2014). Cobalt-polymer nanocomposite dielectrics for miniaturized antennas . JOURNAL OF ELECTRONIC MATERIALS, 43(4), 1097-1106. 10.1007/s11664-014-3025-5

cited authors

  • Raj, PM; Sharma, H; Reddy, GP; Altunyurt, N; Swaminathan, M; Tummala, R; Nair, V

authors

abstract

  • Cobalt-polymer magnetic nanocomposites have been synthesized and characterized for their microstructure and properties such as permeability, permittivity, dielectric and magnetic losses from 100 MHz to 2 GHz to study their suitability as antenna dielectrics. Oxide-passivated cobalt nanoparticles were dispersed in epoxies to form nanocomposite toroids and thin-film resonator structures on organic substrates. Permeabilities of 2.10 and 2.65 were measured up to 500 MHz, respectively, with 25-nm to 50-nm and 5-nm nanoparticles in the nanocomposites. The loss tangent ranged from 0.02 to 0.04 at these frequencies. A combination of stable permeability of ∼2 at 1 GHz to 2 GHz and permittivity of ∼7 was achieved with nanocomposites having 5-nm nanoparticles. The magnetic nanomaterials described in this paper can overcome the limitations from domain-wall and eddy-current losses in microscale metal-polymer composites, leading to enhanced frequency stability. The paper also demonstrates integration of metal-polymer nanocomposites as thin-film build-up layers with two-metal-layer structures on organic substrates. © 2014 TMS.

publication date

  • April 1, 2014

published in

Digital Object Identifier (DOI)

start page

  • 1097

end page

  • 1106

volume

  • 43

issue

  • 4