Improvements of cardiopulmonary monitoring using harmonic six-port radar system

A new bio-radar based on a harmonic six-port junction is proposed to improve the performances of monitoring vital sign systems. The amplitude of heart beat compared to the higher harmonics of breathing and the intermodulation product are the main factors influencing the accuracy of the detection. Simulation-based performance demonstrate the advantage of the novel method using the harmonic six-port discriminator for detection. It has been shown that harmonic six-port radar can meet requirements of monitoring vital sign by cancelling breathing harmonic and intermodulation. Experimental results using the proposed platform at 12 GHz and 24 GHz on patient proved the validity and feasibility of cardiopulmonary estimation using harmonic diversity six-port sensor.