1. Advanced Ceramic Laboratory, Institute of Science and Technology (ICT), Federal University of São Paulo (UNIFESP), São José dos Campos, Brazil
2. Institute of Science and Technology (ICT), Federal University of São Paulo (UNIFESP), São José dos Campos, Brazil
3. National Institute for Space Research, São José dos Campo, Brazil
4. Department of Electrical and Computer Engineering, The University of New Mexico, Albuquerque, NM, USA