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

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...

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Published inJournal of aerospace technology and management Vol. 1; no. 2
Main Authors Valdirene Aparecida da Silva, José Jesus Pereira, Evandro Nohara, Mirabel Cerqueira Rezende
Format Journal Article
LanguageEnglish
Published Instituto de Aeronáutica e Espaço (IAE) 01.07.2011
Subjects
Electromagnetic characterization
Hexaferrite
Radar absorbing materials
Reflectivity
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Summary: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.
ISSN:2175-9146