Dual-Band Skin-Adhesive Repeater Antenna for Continuous Body Signals Monitoring
Felício, J. M.
Fernandes, C. A.
IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology Vol. 2, Nº 1, pp. 25 - 32, March, 2018.
ISSN (print): 2469-7249
Scimago Journal Ranking: (in )
Digital Object Identifier: 10.1109/JERM.2018.2806186
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We present a 35-mm diameter skin-adhesive antenna intended to operate as a gateway to relay the low power signals from a sensor implanted in the body to an external base station (BS). Such device would be useful in the context of Body Area Networks (BANs) for continuous body-signal monitoring. The proposed adhesive repeater is low profile, and it is designed for dual-band operation at the ISM band (2.4 GHz) and in the ultrawideband (UWB) spectrum (4-10.6 GHz) using a single excitation port. The ISM band is used for in-body communication with the implants and the UWB band for off-body burst communication with the BS. The antenna consists of three layers that grant it compactness and performance robustness. We assess the in-body link between the repeater and a custom-designed miniaturized implantable probe antenna. The study is performed in the frequency-domain with results showing adequate input impedance matching (s11 ≤ -10 dB) and robustness to different body parts. We extend the analysis to time-domain by transmitting a synthetized medical signal between the two antennas. In addition, we evaluate the feasibility of an off-body link for burst communication. Again, the results indicate very good performance by the repeater antenna both in terms of impedance matching (s11 ≤ -10 dB) and preservation of time-signals (fidelity ≥ 75%), which is relevant in impulse radio systems. To the authors' best knowledge, this is the first time this kind of dual-band adhesive antenna is being proposed for BANs, complete with performance tests using frequency- and time-domain figures-of-merit.