1. Radio Access and Propagation Metrology Group, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA
2. Ansys Inc, Canonsburg, PA, USA
3. Associate, Radio Access and Propagation Metrology Group, National Institute of Standards and Technology, Gaithersburg, MD, USA
4. Communications Technology Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA