Mutual injection-locked SIL sensor array for vital sign detection with random body movement cancellation

Summary form only given, as follows. This paper presents a self-injection-locked (SIL) sensor array for cancelling the effects of random body movement on the detection of vital signs. The effects of random movements by the subject are cancelled by wireless mutual injection locking (MIL) of the two sensors. In the experiments, a prototype for such a array with a spacing of 2 m was implemented at 2.4 GHz, providing accurate and reliable cardiopulmonary monitoring of a subject who exhibited random body motions of several centimeters.