1. Universitas Negeri Surabaya,Dept. of Electrical Engineering,Surabaya,Indonesia
2. Institut Teknologi Sepuluh Nopember,Dept. of Electrical Engineering,Surabaya,Indonesia
3. Laboratorio Maxwell de Micro-ondas e Electromagnetismo Aplicado IFSP,Susano,Brazil
4. Kumamoto University,Graduate School of Science and Technology,Kumamoto,Japan