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Ultracompact Implantable Design With Integrated Wireless Power Transfer and RF Transmission Capabilities

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      The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues.

      A parametric model was developed to describe the variation of dielectric properties of tissues as a function of frequency. The experimental spectrum from 10 Hz to 100 GHz was modelled with four dispersion regions. The development of the model was based on recently acquired data, complemented by data surveyed from the literature. The purpose is to enable the prediction of dielectric data that are in line with those contained in the vast body of literature on the subject. The analysis was carried out on a Microsoft Excel spreadsheet. Parameters are given for 17 tissue types.
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        Design and optimization of resonance-based efficient wireless power delivery systems for biomedical implants.

        Resonance-based wireless power delivery is an efficient technique to transfer power over a relatively long distance. This technique typically uses four coils as opposed to two coils used in conventional inductive links. In the four-coil system, the adverse effects of a low coupling coefficient between primary and secondary coils are compensated by using high-quality (Q) factor coils, and the efficiency of the system is improved. Unlike its two-coil counterpart, the efficiency profile of the power transfer is not a monotonically decreasing function of the operating distance and is less sensitive to changes in the distance between the primary and secondary coils. A four-coil energy transfer system can be optimized to provide maximum efficiency at a given operating distance. We have analyzed the four-coil energy transfer systems and outlined the effect of design parameters on power-transfer efficiency. Design steps to obtain the efficient power-transfer system are presented and a design example is provided. A proof-of-concept prototype system is implemented and confirms the validity of the proposed analysis and design techniques. In the prototype system, for a power-link frequency of 700 kHz and a coil distance range of 10 to 20 mm, using a 22-mm diameter implantable coil resonance-based system shows a power-transfer efficiency of more than 80% with an enhanced operating range compared to ~40% efficiency achieved by a conventional two-coil system.
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          Simple accurate expressions for planar spiral inductances

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            Author and article information

            Journal
            IEEE Transactions on Biomedical Circuits and Systems
            IEEE Trans. Biomed. Circuits Syst.
            Institute of Electrical and Electronics Engineers (IEEE)
            1932-4545
            1940-9990
            April 2018
            April 2018
            : 12
            : 2
            : 281-291
            10.1109/TBCAS.2017.2787649
            © 2018
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