A Novel Compact Multilayer Antenna Array for 5G mmWave Beam Steering and Its Application
Realizing beam-steerable antennas to compensate for path losses at the mmWave band in a compact design is challenging. To address this, a series-fed antenna array integrated with a $4\times 4$ Butler matrix (BM) is presented. In contrast to standard planar implementations, the proposed design adopts a multilayer struct...