In-Body to On-Body Ultrawideband Propagation Model Derived from Measurements in Living Animals

Author
Floor, Pål Anders
Chavez-Santiago, Raul
Brovoll, Sverre
Aardal, Øyvind
Bergsland, Jacob
Grymyr, Ole-Johannes
Halvorsen, Per Steinar
Palomar, Rafael
Plettemeier, Dirk
Hamran, Svein-Erik
Ramstad, Tor Audun
Balasingham, Ilangko
Date Issued
2015
Keywords
Termset Emneord::Ultrabredbånd (UWB)
Permalink
http://publications.ffi.no/handle/123456789/64
DOI
10.1109/JBHI.2015.2417805
Collection
Articles
Description
Floor, Pål Anders; Chavez-Santiago, Raul; Brovoll, Sverre; Aardal, Øyvind; Bergsland, Jacob; Grymyr, Ole-Johannes; Halvorsen, Per Steinar; Palomar, Rafael; Plettemeier, Dirk; Hamran, Svein-Erik; Ramstad, Tor Audun; Balasingham, Ilangko. In-body to on-body Ultrawideband propagation model derived from measurements in living animals. IEEE journal of biomedical and health informatics 2015 ;Volum 19.(3) s. 938-948
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Abstract
Ultra wideband (UWB) radio technology for wireless implants has gained significant attention. UWB enables the fabrication of faster and smaller transceivers with ultra low power consumption, which may be integrated into more sophisticated implantable biomedical sensors and actuators. Nevertheless, the large path loss suffered by UWB signals propagating through inhomogeneous layers of biological tissues is a major hindering factor. For the optimal design of implantable transceivers, the accurate characterization of the UWB radio propagation in living biological tissues is indispensable. Channel measurements in phantoms and numerical simulations with digital anatomical models provide good initial insight into the expected path loss in complex propagation media like the human body, but they often fail to capture the effects of blood circulation, respiration, and temperature gradients of a living subject. Therefore, we performed UWB channel measurements within 1-6 GHz on two living porcine subjects because of the anatomical resemblance with an average human torso. We present for the first time a path loss model derived from these invivo measurements, which includes the frequency-dependent attenuation. The use of multiple on-body receiving antennas to combat the high propagation losses in implant radio channels was also investigated.
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