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In-Body Antenna for Miniature Biotelemetry Capsules: Increasing Robustness and Radiation Efficiency

Abstract : We propose a miniature, efficient, and versatile antenna for in-body applications. The operating frequency is ISM 434 MHz. The antenna is synthesized using a hybrid analytical–numerical methodology to function within 17 mm × ⌀7 mm biocompatible ceramic encapsulation. The design uses dielectric charging via superstrate of a narrow-band microstrip antenna. In this way, an antenna–body coupling is significantly reduced resulting in improvement of robustness (in terms of matching) and increase in radiation efficiency. The developed antenna stays well-matched (S11 < –10 dB) for a wide range of body tissues (from 42% of electromagnetic properties of muscle up to the maximum properties among body tissues). The 17 MHz bandwidth is sufficient to cover robust operation of the capsule antenna for implantable and ingestible applications. The radiation performance is characterized with the direct illumination technique using an analog fiber optic link. The measured realized gain (max. value –19.6 dBi) exceeds the counterparts by at least 3 dBi. The proposed antenna contributes to further development of a new generation of miniature in-body devices that involve complex and dense integration of sensors, logic, and power source.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01561084
Contributor : Denys Nikolayev <>
Submitted on : Wednesday, July 12, 2017 - 12:39:58 PM
Last modification on : Monday, October 5, 2020 - 9:44:04 AM
Long-term archiving on: : Thursday, January 25, 2018 - 3:01:30 AM

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Denys Nikolayev, Pavel Karban, Maxim Zhadobov, Ronan Sauleau. In-Body Antenna for Miniature Biotelemetry Capsules: Increasing Robustness and Radiation Efficiency. Les journées Scientifiques 2017 de l'URSI-France "Radiosciences au service de l’humanité", URSI-France, Feb 2017, Sophia Antipolis, France. ⟨hal-01561084⟩

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