Resonantly coupled antennas for passive sensors

Rindorf, Lars Henning; Lading, Lars; Breinbjerg, Olav

doi:10.1109/icsens.2008.4716759

Cited by 28 publications

(20 citation statements)

References 1 publication

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“…[44] The readout distance of the inductive coupling method depends on the sensor's quality factor (Q), function of inductance, capacitance, and resistance (R) (Equation (3)). [46] The maximum readout distance was determined by varying those parameters A larger quality factor resulted in a more detectable transient response.…”

Section: Methodsmentioning

confidence: 99%

Fully Printed, Wireless, Stretchable Implantable Biosystem toward Batteryless, Real‐Time Monitoring of Cerebral Aneurysm Hemodynamics

et al. 2019

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This study introduces a high‐throughput, large‐scale manufacturing method that uses aerosol jet 3D printing for a fully printed stretchable, wireless electronics. A comprehensive study of nanoink preparation and parameter optimization enables a low‐profile, multilayer printing of a high‐performance, capacitance flow sensor. The core printing process involves direct, microstructured patterning of biocompatible silver nanoparticles and polyimide. The optimized fabrication approach allows for transfer of highly conductive, patterned silver nanoparticle films to a soft elastomeric substrate. Stretchable mechanics modeling and seamless integration with an implantable stent display a highly stretchable and flexible sensor, deployable by a catheter for extremely low‐profile, conformal insertion in a blood vessel. Optimization of a transient, wireless inductive coupling method allows for wireless detection of biomimetic cerebral aneurysm hemodynamics with the maximum readout distance of 6 cm through meat. In vitro demonstrations include wireless monitoring of flow rates (0.05–1 m s−1) in highly contoured and narrow human neurovascular models. Collectively, this work shows the potential of the printed biosystem to offer a high throughput, additive manufacturing of stretchable electronics with advances toward batteryless, real‐time wireless monitoring of cerebral aneurysm hemodynamics.

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Section: Methodsmentioning

confidence: 99%

Fully Printed, Wireless, Stretchable Implantable Biosystem toward Batteryless, Real‐Time Monitoring of Cerebral Aneurysm Hemodynamics

et al. 2019

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“…Since the efficiency of inductive power transfer is proportional to the magnetic coupling coefficient squared for large enough separation distances [1,2], these expressions bound the performance of these systems in this range. This also suggests optimal geometric coil designs that maximize the limit behavior of the magnetic coupling coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 shows the specific case under consideration, consisting of axially aligned, multi-layer coils i = 1, 2 with separation s and characterized by their inductance L i , turns density ρ N i , outer radius r i , length i , and fill factor f i , where 0 < f i < 1. In the limit as the separation between sender and receiver increases, the magnetic coupling coefficient starts to decrease inversely proportional to the distance cubed, which determines the performance of mid-range inductive systems [1,2,10]. At this long range, while in the near field, the magnetic coupling coefficient can be calculated by combining the mutual inductance, given by…”

Section: Introductionmentioning

confidence: 99%

Limit behavior of the magnetic coupling coefficient for mid-range, near-field applications

Guthrie

Frolenkov

Mur-Miranda

2013

J. Phys.: Conf. Ser.

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Abstract. We have derived compact algebraic bounds for the limit behavior of the magnetic coupling coefficient, κ, for axially aligned multilayer coils. These bounds are validated experimentally. We have also found an expression based on the coil geometry that captures its long-range magnetic behavior. In particular, the limit behavior of the magnetic coupling coefficient is the same for any pair of axially aligned multilayer coils when the separation distance is normalized by this expression.

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“…ω is the operating angular frequency. The equivalent resistance of the proximity effect is another important factor, but mistakenly missed in some former research works [9]. According to our measurements, the lack of the consideration of proximity effect would result in an error rate of up to 210% for the resistance value, when operating at a frequency of 1MHz and the winding is tight.…”

Section: B Internal Serial Resistancementioning

confidence: 69%

An asymmetric resonant coupling wireless power transmission link for Micro-Ball Endoscopy

Sun

Xie

et al. 2010

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology

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This paper investigates the design and optimization of a wireless power transmission link targeting Micro-Ball Endoscopy applications. A novel asymmetric resonant coupling structure is proposed to deliver power to an endoscopic Micro-Ball system for image read-out after it is excreted. Such a technology enables many key medical applications with stringent requirements for small system volume and high power delivery efficiency. A prototyping power transmission sub-system of the Micro-Ball system was implemented. It consists of primary coil, middle resonant coil, and cube-like full-direction secondary receiving coils. Our experimental results proved that 200mW of power can be successfully delivered. Such a wireless power transmission capability could satisfy the requirements of the Micro-Ball based endoscopy application. The transmission efficiency is in the range of 41% (worst working condition) to 53% (best working condition). Comparing to conventional structures, Asymmetric Resonant Coupling Structure improves power efficiency by 13%.

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Resonantly coupled antennas for passive sensors

Cited by 28 publications

References 1 publication

Fully Printed, Wireless, Stretchable Implantable Biosystem toward Batteryless, Real‐Time Monitoring of Cerebral Aneurysm Hemodynamics

Fully Printed, Wireless, Stretchable Implantable Biosystem toward Batteryless, Real‐Time Monitoring of Cerebral Aneurysm Hemodynamics

Limit behavior of the magnetic coupling coefficient for mid-range, near-field applications

An asymmetric resonant coupling wireless power transmission link for Micro-Ball Endoscopy

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