Flexible, polarization-diverse UWB antennas for implantable neural recording systems

Authors: Bahrami, HadiMirbozorgi, Seyed AbdollahAmeli, RezaRusch, LeslieGosselin, Benoit
Abstract: Implanted antennas for implant-to-air data communications must be composed of material compatible with biological tissues. We design single and dual-polarization antennas for wireless ultra-wideband neural recording systems using an inhomogeneous multi-layer model of the human head. Antennas made from flexible materials are more easily adapted to implantation; we investigate both flexible and rigid materials and examine performance trade-offs. The proposed antennas are designed to operate in a frequency range of 2-11 GHz (having S11 below -10 dB) covering both the 2.45 GHz (ISM) band and the 3.1-10.6 GHz UWB band. Measurements confirm simulation results showing flexible antennas have little performance degradation due to bending effects (in terms of impedance matching). Our miniaturized flexible antennas are 12 mm×12 mm and 10 mm×9 mm for single- and dual-polarizations, respectively. Finally, a comparison is made of four implantable antennas covering the 2-11 GHz range: 1) rigid, single polarization, 2) rigid, dual polarization, 3) flexible, single polarization and 4) flexible, dual polarization. In all cases a rigid antenna is used outside the body, with an appropriate polarization. Several advantages were confirmed for dual polarization antennas: 1) smaller size, 2) lower sensitivity to angular misalignments, and 3) higher fidelity.
Document Type: Article de recherche
Issue Date: 1 February 2016
Open Access Date: 20 September 2016
Document version: AM
Permalink: http://hdl.handle.net/20.500.11794/10028
This document was published in: IEEE Transactions on Biomedical Circuits and Systems, Vol. 10 (1), 38–48 (2016)
Alternative version: 10.1109/TBCAS.2015.2393878
Collection:Articles publiés dans des revues avec comité de lecture

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