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Low cost multipurpose RF system approach: Integration of a MIMO radar and a communications frontend on a single PCB

This paper introduces an approach to combine a FMCW MIMO radar frontend with a communications datalink frontend all integrated in a single Printed Circuit Board (PCB). The chosen MIMO configuration allows to integrate communication antennas without increasing the size of the PCB. The system is all incorporated in a single planar PCB with 36 radiating elements, 16 for receive (RX) and 16 for transmit (TX) for the radar as well as 4 for communication purposes. In order to achieve more bandwidth of operation, Resonant Slot Patch Antennas (RSPA) for the radar, and spiral antennas for communication were designed. Electrical measurements of the radar frontend and the communication datalink were carried out with good results. To the best of the authors' knowledge this is the first time that available space in the center of the aperture of a MIMO array is used for a different RF functionality.