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Dielectric-loaded conformal microstrip antennas for versatile in-body applications

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Abstract
Wireless implantable bioelectronics and accurate invivo characterization of path loss require efficient and robust in-body antennas. Loading electric antennas with the effective permittivities higher than that of surrounding tissues are a promising solution. In this letter, proof-of-concept conformal microstrip antennas are proposed. The antennas are optimized for a standard impedance of 50$\Omega$ and operate in all high-water-content tissues. Integral ground plane shields the antenna from inner circuitry. The radiation efficiencies are 0.4, 2.2, and 1.2 for the (434, 868, and 1400)MHz designs, respectively, when computed in a $\varnothing$100mm spherical phantom with muscle-equivalent properties. The efficiencies are compared to the fundamental limitations and closely approach them. Specific absorption rates are evaluated, and the corresponding maximum input power levels are established. Prototypes are fabricated and characterized to validate the design.
Keywords
IMPLANTABLE ANTENNA, PATH LOSS, DESIGN, CONSTANTS, Biomedical telemetry, capsule antenna, conformal antenna, implantable, in-body, ingestible, microstrip antenna, robustness

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Citation

Please use this url to cite or link to this publication:

MLA
Nikolayev, Denys, et al. “Dielectric-Loaded Conformal Microstrip Antennas for Versatile in-Body Applications.” IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, vol. 18, no. 12, 2019, pp. 2686–90.
APA
Nikolayev, D., Joseph, W., Skrivervik, A., Zhadobov, M., Martens, L., & Sauleau, R. (2019). Dielectric-loaded conformal microstrip antennas for versatile in-body applications. IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, 18(12), 2686–2690.
Chicago author-date
Nikolayev, Denys, Wout Joseph, Anja Skrivervik, Maxim Zhadobov, Luc Martens, and Ronan Sauleau. 2019. “Dielectric-Loaded Conformal Microstrip Antennas for Versatile in-Body Applications.” IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 18 (12): 2686–90.
Chicago author-date (all authors)
Nikolayev, Denys, Wout Joseph, Anja Skrivervik, Maxim Zhadobov, Luc Martens, and Ronan Sauleau. 2019. “Dielectric-Loaded Conformal Microstrip Antennas for Versatile in-Body Applications.” IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 18 (12): 2686–2690.
Vancouver
1.
Nikolayev D, Joseph W, Skrivervik A, Zhadobov M, Martens L, Sauleau R. Dielectric-loaded conformal microstrip antennas for versatile in-body applications. IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS. 2019;18(12):2686–90.
IEEE
[1]
D. Nikolayev, W. Joseph, A. Skrivervik, M. Zhadobov, L. Martens, and R. Sauleau, “Dielectric-loaded conformal microstrip antennas for versatile in-body applications,” IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, vol. 18, no. 12, pp. 2686–2690, 2019.
@article{8643693,
  abstract     = {Wireless implantable bioelectronics and accurate invivo characterization of path loss require efficient and robust in-body antennas. Loading electric antennas with the effective permittivities higher than that of surrounding tissues are a promising solution. In this letter, proof-of-concept conformal microstrip antennas are proposed. The antennas are optimized for a standard impedance of 50$\Omega$ and operate in all high-water-content tissues. Integral ground plane shields the antenna from inner circuitry. The radiation efficiencies are 0.4, 2.2, and 1.2 for the (434, 868, and 1400)MHz designs, respectively, when computed in a $\varnothing$100mm spherical phantom with muscle-equivalent properties. The efficiencies are compared to the fundamental limitations and closely approach them. Specific absorption rates are evaluated, and the corresponding maximum input power levels are established. Prototypes are fabricated and characterized to validate the design.},
  author       = {Nikolayev, Denys and Joseph, Wout and Skrivervik, Anja and Zhadobov, Maxim and Martens, Luc and Sauleau, Ronan},
  issn         = {1536-1225},
  journal      = {IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS},
  keywords     = {IMPLANTABLE ANTENNA,PATH LOSS,DESIGN,CONSTANTS,Biomedical telemetry,capsule antenna,conformal antenna,implantable,in-body,ingestible,microstrip antenna,robustness},
  language     = {eng},
  number       = {12},
  pages        = {2686--2690},
  title        = {Dielectric-loaded conformal microstrip antennas for versatile in-body applications},
  url          = {http://dx.doi.org/10.1109/LAWP.2019.2948814},
  volume       = {18},
  year         = {2019},
}

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