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A study of noncontact vital signal radar adopting the phase shift technique for detecting the target located at the different locations in the detection path is reported. A theoretical analysis for determining the appropriate conversion gain of the radar to detect the vital signal of the target with adopting only two phase states will be described. With choosing the appropriate down-conversion gain...
A novel noncontact heartbeat and respiration monitoring system that can eliminate the null point in the detection of vital signal is reported. The new type of vital signal radar is composed of a variable-gain low-noise amplifier, direct conversion mixer, biphase phase shifter, and local oscillator, which are all homemade circuits constructed with Si bipolar transistors. Moreover, the radar consumes...
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