title: Design guidelines for radio frequency non-contact vital sign detection.
abstract: The design guidelines for non-contact vital sign detection are presented in this paper. Firstly, the choice of radio frequency and antenna beamwidth is demonstrated by numerical simulation based on ray-tracing technique and spectrum analysis. Guided by the numerical results of the first part, three typical radar architectures are recently built in one of the ISM bands (the 5.8 GHz band). The characteristics of each architecture are demonstrated and compared based on measurement results. Experiments show that direct-conversion non-quadrature architecture has DC offset and null detection point problem; direct-conversion quadrature architecture can eliminate null detection point but lead to complexity and higher power consumption in effectively combining two quadrature channels. Double-sideband indirect-conversion with simpler radio architecture and less baseband requirement can effectively alleviate the DC offset and null detection point problems.
authors.affiliation: Department of Electrical & Computer Engineering, University of Florida, Gainesville, Florida 32611, USA. changzhi@ufl.edu
authors.forename: Changzhi
authors.initials: C
authors.lastname: Li
authors.forename: Yanming
authors.initials: Y
authors.lastname: Xiao
authors.forename: Jenshan
authors.initials: J
authors.lastname: Lin
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004562:Electrocardiography / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008872:Microwaves; D008954:Models, Biological; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D012129:Respiratory Function Tests / Q000295:instrumentation* / Q000379:methods; D015656:Respiratory Mechanics / Q000502:physiology*