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Experimental Evaluation of Filtering and Isolation in Highly Integrated mmWave Harmonic Radar

In this paper, the importance of RF filters and isolation in active elements in a harmonic FMCW radar system is investigated experimentally. The harmonic FMCW radar is designed in the 61/122-GHz industrial, scientific, and medical (ISM) frequency bands. The radar is based on two self-designed monolithic microwave wave integrated circuits (MMIC) for the transceiver (TRX) and tag which are fabricated in a 130-nm SiGe BiCMOS technology. Different system-level measurements under worst-case conditions are carried out to quantify the resilience of the system to clutter. In a systematic approach, the different scenarios are used to analyze the frequency and parasitic coupling path of the spurious signal in the bi-static system. Based on the measurement results, solutions on the system-level are given for highly accurate and robust measurements in an environment that is unfeasible for conventional FMCW radar.