On the Design of Miniature MedRadio Implantable Antennas

Bakogianni, Sofia; Koulouridis, Stavros

doi:10.1109/tap.2017.2702718

Cited by 34 publications

(9 citation statements)

References 34 publications

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“…In this frame, a wide range of antennas has been recently reported for bodyimplantable capsule applications, e.g. [9]- [17]. Robustness to heterogeneous and uncertain electromagnetic (EM) properties of tissues was considered in [18]- [21], and a reconfigurable capsule-conformal antenna without nulls in its radiation pattern was proposed in [22].…”

Section: Introductionmentioning

confidence: 99%

Dielectric-Loaded Conformal Microstrip Antennas for Versatile In-Body Applications

Nikolayev

Joseph

Skrivervik

et al. 2019

Antennas Wirel. Propag. Lett.

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Wireless implantable bioelectronics and accurate in vivo characterization of path loss require efficient and robust in-body antennas. Loading electric antennas with the effective permittivities higher than that of surrounding tissues is a promising solution. In this study, proof-of-concept conformal microstrip antennas are proposed. The antennas are optimized for a standard impedance of 50 Ω and operate in all high-watercontents 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 100-mm spherical phantom with muscleequivalent properties. The efficiencies are compared to the fundamental limitations and closely approaches them. Specific absorption rates are evaluated, and the corresponding maximum input power levels are established. Prototypes are fabricated and characterized to validate the design.

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Section: Introductionmentioning

confidence: 99%

Dielectric-Loaded Conformal Microstrip Antennas for Versatile In-Body Applications

Nikolayev

Joseph

Skrivervik

et al. 2019

Antennas Wirel. Propag. Lett.

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“…Q factor can also be linked to the fractional bandwidth (FBW) [143]. FBW is defined as the difference between two bounded frequency ω± for ω r where VSWR equals a constant for a respective reflection coefficient value.…”

Section: Quality Factor and Stability Of Implantable Antennamentioning

confidence: 99%

“…To interpret changes occurring inside the implantation tissue, the change in impedance (resonance frequency) of the antenna due to changes in DPs is correlated to either physiological or pathological change.Therefore, the sensitivity and selectivity of this sensing approach are highly related to attributes of antenna such as the quality factor and implicitly its operational frequency and bandwidth[142]. Following DPs measurements of CSF at different ages in chapter 3, sensing sensitivity of antenna is implicitly not affected by age.Typically, the efficiency and quality factor of implantable antennas suffer chiefly from dielectric losses of biological tissues[143]. The proposed antennas exploit narrow slits and gaps as capacitors for sensing the relative permittivity of CSF.…”

mentioning

confidence: 99%

Compact Implantable Antennas for Cerebrospinal Fluid Monitoring

Manoufali

Bialkowski

Mohammed

et al. 2019

IEEE Trans. Antennas Propagat.

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“…Body-implanted devices can monitor physiological parameters, perform treatments, or establish neural interfaces while maintaining mobility and quality of life of a patient [1]. The devices rely on antennas to transmit biotelemetry data or to receive operational and treatment instructions [2]- [5]. Multi-band antennas can integrate both data transmission and wireless power transfer functionality increasing the available space inside an in-body device [6].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Characterization of in-Body Antennas

Nikolayev

2018

2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)

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Emerging wireless in-body devices pave the way to many breakthroughs in healthcare and clinical research. This technology enables monitoring of physiological parameters while maintaining mobility and freedom of movement of its user. However, establishing reliable communication between an in-body device and external equipment is still a major challenge. The radiation efficiency is constrained by attenuation and reflection losses in tissues. Furthermore, the antennas suffer from impedance detuning issues caused by uncertain electromagnetic properties of body tissues. First, we show that choosing an optimal operating frequency depends on application scenarios and can reduce the losses. Specific designs are then discussed to mitigate the antenna detuning effects due to surrounding biological tissue. Modeling approaches are proposed to lessen the design and optimization complexity. Finally, we present an accurate characterization method of in-body antennas in canonical phantoms using analog fiber optic links.

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On the Design of Miniature MedRadio Implantable Antennas

Cited by 34 publications

References 34 publications

Dielectric-Loaded Conformal Microstrip Antennas for Versatile In-Body Applications

Dielectric-Loaded Conformal Microstrip Antennas for Versatile In-Body Applications

Compact Implantable Antennas for Cerebrospinal Fluid Monitoring

Modeling and Characterization of in-Body Antennas

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