The characteristics of continuous-wave millimeter-wave/terahertz radars make them candidates to remotely sense the
physiological parameters of individuals, such as respiration and heart rates. The characteristics of these radars include
transmission through the atmosphere and clothing, well-collimated beams, and sensitivity to small displacements. The
directional Doppler velocity can be used to measure the movement of a subject's chest wall due to respiration and the
more subtle motion of the body due to the cardiopulmonary system. We will present an overview of two systems that
have been developed along with representative data from each.