A W-band Omnidirectional FMCW Radar with 18.18dBm Pout 6.76dB NF 52dB Isolation for 4.7cm Resolution and 10m Detection Distance

The frequency modulated continuous-wave (FMCW) radars at sub-terahertz have gained significant attention in short-distance sensing due to their high resolution. To prevent receiver (Rx) saturation during continuous wave (CW) operation, it is imperative for FMCW radars to achieve high isolation between the transmitter (Tx) and Rx in the front-end. As demonstrated in [1], a 140GHz CMOS FMCW monostatic radar achieves 3.54cm resolution imaging and 33.3dB of total TRx isolation through an adaptive self-interference cancellation technique. To further improve the TRx isolation, a single-antenna TRx SoC featuring continuous-time adaptive leakage cancellation is proposed to achieve 40 dB isolation [2]. However, the detection range, and detection angle of these FMCW radars pose challenges in meeting requirements of unmanned aerial vehicle (UAV) radar. The integrated micro-system using multiple TRx-chips with array antennas is used to significantly enhance the detection range with relatively low resolution [3, 4]. A monostatic and bistatic G-band radar based on TRXs with on-chip antennas is presented, which exhibits 2.1cm resolution and 40dB isolation with limited detection angle and range [5]. Hence, the current FMCW radar is hard to meet the requirements for high resolution, extensive detection range, and wide angle simultaneously.