Miniaturized High Gain Flexible Spiral Antenna Tested in Human-Like Tissues

A miniaturized helical antenna is presented in this work. The antenna is flexible, it is 6100 μm long and it has a diameter of 352 μm. This antenna has such a small cross-section, that permits to be implanted in the human body with fine syringes and minimally invasive surgeries. The antenna can be u...

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Bibliographic Details
Published in:IEEE transactions on nanotechnology 2022, Vol.21, p.772-777
Main Authors: Fernandez-Munoz, Miguel, Sanchez-Montero, Rocio, Lopez-Espi, Pablo Luis, Martinez-Rojas, Juan A., Diez-Jimenez, Efren
Format: Article
Language:English
Subjects:
Antenna measurements
Antennas
Biocompatibility
Biomedical materials
Diameters
Gain
Helical antenna
Helical antennas
High gain
high gain antenna
implantable medical device (IMD)
miniaturized flexible thin antenna
Polytetrafluoroethylene
Receiving antennas
Reflectance
Reflector antennas
Resonant frequencies
Resonant frequency
spiral antenna
Spiral antennas
Tissues
wireless power transfer (WPT)
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Summary:A miniaturized helical antenna is presented in this work. The antenna is flexible, it is 6100 μm long and it has a diameter of 352 μm. This antenna has such a small cross-section, that permits to be implanted in the human body with fine syringes and minimally invasive surgeries. The antenna can be used to receive power and/or send information in medical devices. The antenna is made of biocompatible materials: polytetrafluoroethylene (PFTE) and copper. The fundamental parameters of the antenna have been simulated and experimentally measured in animal human-like tissues, showing good agreement. The resonant frequency of the antenna is 4.7 GHz, with a reflection coefficient of −25.1 dB, and a gain of −4.7 dBi. As expected, the resonant frequency decreases inside biological tissues comparing to the free-space open-air measurement. Reducing the resonant frequency is an advantage because power signals can penetrate deeper into body tissues.
ISSN:1536-125X
1941-0085
DOI:10.1109/TNANO.2022.3225912