In this paper, a work-in-progress hardware concept for a millimeter-wave (mmWave) frequency-modulated continuous-wave (FMCW) radar system is presented. Separate, individual application specific integrated circuits (ASICs) and
a substrate-integrated waveguide (SIW) antenna design allow flexible configuration of the system, especially with regard to the number of transmit/receive paths. A major challenge in this mmWave frequency range is signal distribution, not only within an ASIC or printed circuit board (PCB), but especially between ASIC and PCB or SIW antenna. Hence, necessary interconnects are considered in details and multiple concepts are presented.