1. Communication Company of Iran (MCI)P.O. Box 19919‐54651TehranIran
2. Electromagnetic and Antenna LaboratoryAmirkabir University of TechnologyP.O. Box 15875‐4413TehranIran
3. Department of Energy Engineering and PhysicsAmirkabir University of TechnologyP.O. Box 15875‐4413TehranIran