Body-worn passive planar harmonic tag design for use with Doppler radar

A body-worn passive planar harmonic tag for sensing and uniquely isolating human respiratory motion using a Doppler radar has been designed, fabricated and tested. Agilent´s advanced design system 2006 provided a simulation and performance evaluation platform. This design flow is applicable for any tag design and not just dipoles which has been the design of choice for others in the past. The tag has been designed for 2.45/4.9 ghz and shown to work at distances greater than 1 meter with transmitted power levels of 10 mw. The implications of this result is that the designed tag can be used to monitor and isolate a subject´s cardiopulmonary chest motion from extraneous motion, as well as enable positive identification of the subject in a suitable environment (in home or hospital).