“…Today, near-field focusing antennas are widely used in many applications, such as microwave imaging [1,2], wireless energy transfer (WPT) [3,4], microwave hyperthermia [5], and radio frequency identification (RFID) [6,7]. For a traditional dielectric lens antenna, the incident waves from different positions of the lens arrive at the focal point in the same phase to achieve near-field focusing [8].…”