Small Triple-Band Meandered PIFA for Brain-Implantable Biotelemetric Systems: Development and Testing in a Liquid Phantom

We present a meandered triple-band planar-inverted-F antenna (PIFA) for integration into brain-implantable biotelemetric systems. The target applications are wireless data communication, far-field wireless power transfer, and switching control between sleep/wake-up mode at the Medical Device Radioco...

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Bibliographic Details
Published in:International journal of antennas and propagation 2021, Vol.2021, p.1-13
Main Authors: Pournoori, Nikta, Sydänheimo, Lauri, Rahmat-Samii, Yahya, Ukkonen, Leena, Björninen, Toni
Format: Article
Language:English
Subjects:
Antennas
Bandwidths
Biotelemetry
Brain
Brain research
Cerebrospinal fluid
Electromagnetic fields
Electronic implants
Far fields
Medical devices
Radiation
Radiators
Simulation
Telemetry
Wireless communications
Wireless power transmission
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Summary:We present a meandered triple-band planar-inverted-F antenna (PIFA) for integration into brain-implantable biotelemetric systems. The target applications are wireless data communication, far-field wireless power transfer, and switching control between sleep/wake-up mode at the Medical Device Radiocommunication Service (MedRadio) band (401–406 MHz) and Industrial, Scientific and Medical (ISM) bands (902–928 MHz and 2400–2483.5 MHz), respectively. By embedding meandered slots into the radiator and shorting it to the ground, we downsized the antenna to the volume of 11 × 20.5 × 1.8 mm3. We optimized the antenna using a 7-layer numerical human head model using full-wave electromagnetic field simulation. In the simulation, we placed the implant in the cerebrospinal fluid (CSF) at a depth of 13.25 mm from the body surface, which is deeper than in most works on implantable antennas. We manufactured and tested the antenna in a liquid phantom which we replicated in the simulator for further comparison. The measured gain of the antenna reached the state-of-the-art values of −43.6 dBi, −25.8 dBi, and −20.1 dBi at 402 MHz, 902 MHz, and 2400 MHz, respectively.
ISSN:1687-5869
1687-5877
DOI:10.1155/2021/6035169