A Performance-Enhanced Antenna for Microwave Biomedical Applications by Using Metasurfaces

In this paper, we introduce a novel antenna employing specifically-designed metasurfaces to improve the radiating performance in close proximity to the human body, as required in microwave biomedical applications. We firstly present design guidelines to realize a thin metasurface acting as an impeda...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2023-04, Vol.71 (4), p.1-1
Main Authors: Brizi, Danilo, Conte, Maria, Monorchio, Agostino
Format: Article
Language:English
Subjects:
Antennas
Biological system modeling
Biological tissues
Biology
biomedical applications
Biomedical materials
Impedance
Impedance matching
Matching layers (electronics)
Mathematical models
Medical electronics
Medical imaging
metamaterials
Metasurfaces
microwave imaging
Performance enhancement
Phantoms
Tissues
Transmission lines
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Summary:In this paper, we introduce a novel antenna employing specifically-designed metasurfaces to improve the radiating performance in close proximity to the human body, as required in microwave biomedical applications. We firstly present design guidelines to realize a thin metasurface acting as an impedance matching layer between the radiating element and the biological tissue, based on the transmission line equivalent model. Additionally, for the first time to the best of our knowledge, we combine an artificial magnetic conductor as the backing element of the antenna, to improve the gain and reduce the undesired back radiation. To validate the proposed approach, we conceived a numerical test-case consisting of a bow-tie antenna operating close to a biological phantom at 2.56 GHz. Numerical simulations demonstrated the performance enhancement in terms of higher field penetration within tissues and better radiating behavior when the bow-tie antenna is working in presence of both the metasurfaces. Furthermore, measurements carried out over fabricated prototypes confirmed the numerical results, validating the overall design procedure. The herein presented methodology can be helpful in several applications when the radiating elements operate in close proximity to biological tissues, as in medical imaging, on-body communication, mobile phones and consumer devices.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2023.3242414