1. Czech Technical University in Prague,Faculty of Electrical Engineering,Department of Electromagnetic Field,Prague,Czech Republic
2. University of Las Palmas de Gran Canaria,Technological Centre for Innovation in Communications,Las Palmas,Spain
3. University of La Laguna,Department of Industrial Engineering,Santa Cruz de Tenerife,Spain
4. Universidad de Las Palmas de Gran Canaria,Institute for Technological Development and Innovation in Communications,Las Palmas de Gran Canaria,Spain