Microw(h)att?! Ultralow-Power Six-Port Radar: Realizing Highly Integrated Portable Radar Systems with Good Motion Sensitivity at Relatively Low Cost

Short-range noncontact microwave radar systems have undergone significant development in recent years [1]. Driven by advances in modern monolithic microwave integrated circuitry, printed circuit board (PCB) technologies, and embedded computing, highly integrated portable radar systems with good motion sensitivity can today be realized at relatively low cost. Radar systems have emerged in a variety of new application fields including industrial sensing [2], [3], human vital-sign detection [4], [5], and structural health monitoring [6].