ELECTROMAGNETIC BEHAVIOR OF RADAR ABSORBING MATERIALS BASED ON CA HEXAFERRITE MODIFIED WITH CO-TI IONS AND DOPED WITH LA. doi: 10.5028/jatm.2009.0102255263

Authors

  • Valdirene Aparecida da Silva Institute of Aeronautics and Space São José dos Campos/SP
  • José Jesus Pereira University of Taubaté Taubaté/ SP
  • Evandro Nohara University of Taubaté Taubaté/ SP
  • Mirabel Cerqueira Rezende Institute of Aeronautics and Space São José dos Campos/SP

Keywords:

Radar absorbing materials, Electromagnetic characterization, Hexaferrite, Reflectivity

Abstract

Radar Absorbing Materials (RAM) are compounds that absorb incidental electromagnetic radiation in tuned frequencies and dissipate it as heat. Its preparation involves the adequate processing of polymeric matrices filled with compounds that act as radar absorbing centers in the microwave range. This work shows the electromagnetic evaluation of RAM based on CoTi and La doped Ca hexaferrite. Vibrating Sample Magnetization analyses show that ion substitution promoted low values for the parameters of saturation magnetization (123.65 Am²/kg) and coercive field (0.07 T) indicating ferrite softening. RAM samples obtained using different hexaferrite concentrations (40-80 per cent, w/w) show variations in complex permeability and permittivity parameters and also in the performance of incidental radiation attenuation. Microwave attenuation values between 40 and 98 per cent were obtained.

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Published

2011-07-28

Issue

Vol. 1 No. 2 (2009): Jul./Dec. 2009

Section

Original Papers

License

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