A 28-GHz CMOS Direct Conversion Transceiver With Packaged 2 × 4 Antenna Array for 5G Cellular System. - Hong-Teuk Kim; Byoung-Sun Park; Seong-Sik Song; Tak-Su Moon; Sohyeong Kim; Jongmoon Kim; Ji-Young Chang; Yo-Chul Ho (IEEE J. Solid State Circuits, 2018)