A 132-to-148GHz CMOS 4TX-4RX FMCW Radar Transceiver Array with Cavity-Backed Antenna-in-Package Achieving 28dBm EIRP

Due to the large available bandwidth, the D-band (110 to 170GHz) spectrum is promising for future high-resolution radars and high-data-rate wireless communications [1]–[3]. To compensate for the substantial free-space loss, D-band radar transceivers are required to generate a large equivalent isotropic radiated power (EIRP); however, the EIRPs of latest reported CMOS/SiGe D-band FMCW radar transceivers [4]–[8] were less than 11.6/18dBm without adopting lenses. ERIP is limited by three constraints: 1) array size of the reported single-chip FMCW radar transceivers [4]–[8] was only 1TX-1RX; 2) the low output power of the frequency multiplier and power amplifier (PA), which is due to the low breakdown voltage and unity-power-gain frequency (fMAx) of the advanced CMOS/SiGe process; 3) the low gain of the CMOS on-chip antenna, which was 3dBi in [5] and 1.8dBi in [1]. To address the above three issues, this paper presents a 132-to-148GHz 4TX-4RX FMCW radar transceiver array achieving an EIRP of 28.7dBm, with a high-power amplitude-phase harmonic modulated frequency quadrupler, a high-power PA using a low-loss slow-wave coplanar waveguide (CPW) and an LC-Iadder-based power-combiner, and a cavity-backed antenna-in-package (AiP).