Characterization of Implantable Antennas for Intracranial Pressure Monitoring: Reflection by and Transmission Through a Scalp Phantom

Warty, R.; Tofighi, Mohammad; Kawoos, Usmah; Rosen, A.

doi:10.1109/tmtt.2008.2004254

Cited by 126 publications

(45 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In particular, results regarding the effect of insulation layers on real sources are reported in [3]- [5].…”

mentioning

confidence: 99%

“…Three distinct superstrates, that do no completely surround the source and have different thicknesses and (varying within 3 and 9), are considered in [3], while [4] presents only thickness variation and [5] emphasizes the impact of coating thickness over time. As clearly pointed out in these works, varying the insulation properties strongly modifies the radiation characteristics and hence the input impedances, matching and efficiencies.…”

mentioning

confidence: 99%

“…As clearly pointed out in these works, varying the insulation properties strongly modifies the radiation characteristics and hence the input impedances, matching and efficiencies. Radiation efficiencies at different resonant frequencies and/or matching levels are compared in [3]- [5]. Theoretical results on the broad band matching properties achievable by insulated implanted antennas are presented in [6], supported by a practical realization.…”

mentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Insulating Layers on the Performance of Implanted Antennas

Merli

Fuchs

Mosig

et al. 2011

IEEE Trans. Antennas Propagat.

122

View full text Add to dashboard Cite

Abstract-This work presents the analysis of the influence of insulation on implanted antennas for biotelemetry applications in the Medical Device Radiocommunications Service band. Our goal is finding the insulation properties that facilitate power transmission, thus enhancing the communication between the implanted antenna and an external receiver. For this purpose, it has been found that a simplified model of human tissues based on spherical geometries excited by ideal sources (electric dipole, magnetic dipole and Huygens source) provides reasonable accuracy while remaining very tractable due to its analytical formulation. Our results show that a proper choice of the biocompatible internal insulation material can improve the radiation efficiency of the implanted antenna (up to six times for the investigated cases). External insulation facilitates the electromagnetic transition from the biological tissue to the outer free space, reducing the power absorbed by the human body. Summarizing, this work gives insights on the enhancement of power transmission, obtained with the use of both internal, biocompatible and external, flexible insulations. Therefore, it provides useful information for the design of implanted antennas.

show abstract

“…In particular, results regarding the effect of insulation layers on real sources are reported in [3]- [5].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Insulating Layers on the Performance of Implanted Antennas

Merli

Fuchs

Mosig

et al. 2011

IEEE Trans. Antennas Propagat.

122

View full text Add to dashboard Cite

show abstract

“…On the basis of SAR results and limitations (Table 1), the transmitting antenna was assumed to have an input power of 3.7 mW (i.e., the most restrictive case). Power received at the external half-wavelength dipole was obtained by the transmission coefficient, determined by the relation between available power at the transmitter implanted antenna and received power at the 50 Ω load that terminated the receiver antenna [42]. Results from the muscle tissue cuboid phantom and the anatomical model are illustrated in Fig.…”

Section: Transmission Channelmentioning

confidence: 99%

Multilayered Broadband Antenna for Compact Embedded Implantable Medical Devices: Design and Characterization

García-Miquel¹,

Curto²,

Vidal³

et al. 2017

PIER

View full text Add to dashboard Cite

Abstract-Design and characterization of a multilayered compact implantable broadband antenna for wireless biotelemetry applications is presented in this paper. The main features of this novel design are miniaturized size, structure that allows integration of electronic circuits of the implantable medical device inside the antenna, and enhanced bandwidth that mitigates possible frequency detuning caused by heterogeneity of biological tissues. Using electromagnetic simulations based on the finite-difference timedomain method, the antenna geometry was optimized to operate in the 401-406 MHz Medical Device Radio communications service band. The proposed design was simulated implanted in a muscle tissue cuboid phantom and implanted in the arm, head, and chest of a high-resolution whole-body anatomical numerical model of an adult human male. The antenna was fabricated using low-temperature co-fired ceramic technology. Measurements validated simulation results for the antenna implanted in muscle tissue cuboid phantom. The proposed compact antenna, with dimensions of 14 mm × 16 mm × 2 mm, presented a −10 dB bandwidth of 103 MHz and 92 MHz for simulations and measurements, respectively. The proposed antenna allows integration of electronic circuit up to 10 mm × 10 mm × 0.5 mm. Specific absorption rate distributions, antenna input power, radiation pattern and the transmission channel between the proposed antenna and a half-wavelength dipole were evaluated.

show abstract

“…Soontornpipit et al [7], evaluated s 11 of spiral and serpentine antennas at the MICS band. In a study by Warty and Tofighi [8], characterization of implantable PIFAs, designed for intracranial pressure (ICP) monitoring at 2.45 GHz, has been presented. In [9], an H-shaped cavity slot antenna was miniaturized and the characteristics of the antenna calculated by the FDTD method at the ISM band.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional FDTD Analysis of the Dual-Band Implantable Antenna for Continuous Glucose Monitoring

Hojjat-Kashani

2012

PIER Letters

View full text Add to dashboard Cite

Abstract-The finite difference time domain (FDTD) method is widely used as a computational tool to simulate the electromagnetic wave propagation in biological tissues. When expressed in terms of Debye parameters, dispersive biological tissues dielectric properties can be efficiently incorporated into FDTD codes. In this paper, FDTD formulation with nonuniform grid is presented to simulate a dual medical implant communications service (MICS) (402-405 MHz) and industrial, scientific, and medical (ISM) (2.4-2.48 GHz) band implantable antenna for continuous glucose-monitoring applications. In addition, we present computationally simpler two-pole Debye models that retain the high accuracy of the Cole-Cole Model for dry skin in MICS and ISM bands. The reflection coefficient simulation result with Debye dispersion is presented and compared with the published results. FDTD was also applied to analyze antenna's farfield.

show abstract

Characterization of Implantable Antennas for Intracranial Pressure Monitoring: Reflection by and Transmission Through a Scalp Phantom

Cited by 126 publications

References 20 publications

The Effect of Insulating Layers on the Performance of Implanted Antennas

The Effect of Insulating Layers on the Performance of Implanted Antennas

Multilayered Broadband Antenna for Compact Embedded Implantable Medical Devices: Design and Characterization

Three-Dimensional FDTD Analysis of the Dual-Band Implantable Antenna for Continuous Glucose Monitoring

Contact Info

Product

Resources

About