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A w-band MMIC radar system for remote detection of vital signs

: Diebold, S.; Ayhan, S.; Scherr, S.; Massler, H.; Tessmann, A.; Leuther, A.; Ambacher, O.; Zwick, T.; Kallfass, I.


Journal of infrared, millimeter, and terahertz waves 33 (2012), Nr.12, S.1250-1267
ISSN: 1866-6892
ISSN: 1866-6906
Fraunhofer IAF ()
cardiopulmonary activity; continuous wave (CW) radar; heartbeat rate; millimeter wave radar; MMIC; radar remote sensing; respiration; vital signs

In medical and personal health systems for vital sign monitoring, contact-free remote detection is favourable compared to wired solutions. For example, they help to avoid severe pain, which is involved when a patient with burned skin has to be examined. Continuous wave (CW) radar systems have proven to be good candidates for this purpose. In this paper a monolithic millimetre-wave integrated circuit (MMIC) based CW radar system operating in the W-band (75-110 GHz) at 96 GHz is presented. The MMIC components are custom-built and make use of 100 nm metamorphic high electron mobility transistors (mHEMTs). The radar system is employing a frequency multiplier-by-twelve MMIC and a receiver MMIC both packaged in split-block modules. They allow for the determination of respiration and heartbeat frequency of a human target sitting in 1 m distance. The analysis of the measured data is carried out in time and frequency domain and each approach is shown to have its advantages and drawbacks.