1. Guangdong Engineering Research Center of Base Station Antennas and Propagation, the Shenzhen Key Laboratory of Antennas and Propagation, and the College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
2. Department of Mechanical Engineering, University of Maryland, College Park, MD, USA
3. Department of Electrical and Computer Engineering, National University of Singapore, Queenstown, Singapore