Millimeter Wave Six-Port Radar Sensor for Precise Displacement Measurements and Gesture Sensing Applications

This paper presents a millimeter wave bistatic radar sensor for short-range applications. The sensor can detect the precise movements of subjects and to estimate the distance and relative velocity. A six-port architecture is used. The sensor operates at 79 GHz and generates differential quadrature baseband signals that can be directly used, without complex signal processing, for different measurement applications. A calibrated tuning fork experiment validates precise displacement claim by measuring the mechanical oscillation frequency. Several hand gesture experiments are also performed with promising results. The proposed simple, robust and low-cost radar sensor can be used in industry, biomedical domain and security.