Compared to narrow-band radio technology such as Bluetooth, Ultra-wideband (UWB) radio can provide centimeter and even sub-centimeter level ranging accuracy as it uses nano-second pulses to obtain precise time of flight information. Moreover, by properly designing the sequence of the nano-second pulses as specified in the latest IEEE 802.15.4z standard, UWB radio can provide secure distance bounding. Levering the aforementioned unique nature of UWB, CCC (car connectivity consortium) further introduces UWB in the automatic market. Nowadays, we have already seen that UWB radio modules (aka anchors) have been deployed in premium cars to provide secure keyless entry solutions from different OEMS. The following emerging use case of the UWB is to enable radar functionality by essentially reusing UWB radio design. The IEEE 802.15.4ab task group, the successor std. of 802.15.4z, specifies the UWB radar functionality. IMEC has more than 15-year’s track records in ultra-low power wireless IC and system design. As a result, IMEC’s UWB transceiver design achieves ten times lower power consumption compared to other existing products in the market. This presentation will especially reveal IMEC’s R&D output of UWB radar for in-cabin sensing. Specifically, we will report the latest results of IMEC’s UWB radar hardware and algorithmic designs for breathing detection and gesture recognition. By reusing the in-car UWB anchors as radars, we will demonstrate that the robustness breathing detection can achieve child presence detection (CPD) requirements defined in Euro NCAP In addition, we will show hand movement classification results using the UWB radar sensor and machine-learning-based processing. Such developments will shed light on how to enrich using UWB radars to enable other in-cabin sensing applications.Finally, we will share the future R&D roadmap on the UWB radar, including next-gen HW and algorithmic design.