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Article

Effects of Dielectric Properties of Human Body on Communication Link Margins and Specific Absorption Rate of Implanted Antenna System

by
Soham Ghosh
1,*,
Sunday C. Ekpo
2,
Fanuel Elias
2,
Stephen Alabi
3 and
Bhaskar Gupta
1
1
Department of Electronics and Telecommunication Engineering, Jadavpur University, Kolkata 700032, India
2
Communication and Space Systems Engineering Research Team, Manchester Metropolitan University, Manchester M1 5GD, UK
3
SmOp Cleantech, Wilsons Park, Monsall Road, Manchester M40 8WN, UK
*
Author to whom correspondence should be addressed.
Sensors 2025, 25(11), 3498; https://doi.org/10.3390/s25113498
Submission received: 14 April 2025 / Revised: 28 May 2025 / Accepted: 30 May 2025 / Published: 31 May 2025
(This article belongs to the Section Biomedical Sensors)

Abstract

This study examines how the effective dielectric characteristics of the human torso affect the carrier-link-margin (CLM) and data-link-margin (DLM) of a biocompatible gelatin-encapsulated implantable medical device (IMD) that consists of a small implantable antenna, battery, printed circuit board (PCB), camera, and sensor operating at 2.5 GHz. The specific absorption rate (SAR) and the radio frequency (RF) link performances of the IMD are tested for ±20% changes in reference to the mean values of the effective relative permittivity, ɛeff, and the effective conductivity, σeff, of the human body model. An artificial neural network (ANN) with two inputs (ɛeff, σeff) and five outputs (SAR_1g, SAR_10g, fractional bandwidth, CLM, and DLM) is trained by 80% of the total scenarios and tested by 20% of them in order to provide reliable dependent analyses. The highest changes in 1g SAR value, 10g SAR value, fractional bandwidth, CLM, and DLM at a 4 m distance for 100 Kbps are 63%, 41.6%, 17.97%, 26.79%, and 5.89%, respectively, when compared to the reference effective electrical properties of the homogeneous human body model. This work is the first to accurately depend on the electrical analyses of the human body for the link margins of an implantable antenna system. Furthermore, the work’s uniqueness is distinguished by the application of the CLM and DLM principles in the sphere of IMD communication.
Keywords: biotelemetry; carrier link margin; data link margin; implantable antenna; meander line; specific absorption rate biotelemetry; carrier link margin; data link margin; implantable antenna; meander line; specific absorption rate

Share and Cite

MDPI and ACS Style

Ghosh, S.; Ekpo, S.C.; Elias, F.; Alabi, S.; Gupta, B. Effects of Dielectric Properties of Human Body on Communication Link Margins and Specific Absorption Rate of Implanted Antenna System. Sensors 2025, 25, 3498. https://doi.org/10.3390/s25113498

AMA Style

Ghosh S, Ekpo SC, Elias F, Alabi S, Gupta B. Effects of Dielectric Properties of Human Body on Communication Link Margins and Specific Absorption Rate of Implanted Antenna System. Sensors. 2025; 25(11):3498. https://doi.org/10.3390/s25113498

Chicago/Turabian Style

Ghosh, Soham, Sunday C. Ekpo, Fanuel Elias, Stephen Alabi, and Bhaskar Gupta. 2025. "Effects of Dielectric Properties of Human Body on Communication Link Margins and Specific Absorption Rate of Implanted Antenna System" Sensors 25, no. 11: 3498. https://doi.org/10.3390/s25113498

APA Style

Ghosh, S., Ekpo, S. C., Elias, F., Alabi, S., & Gupta, B. (2025). Effects of Dielectric Properties of Human Body on Communication Link Margins and Specific Absorption Rate of Implanted Antenna System. Sensors, 25(11), 3498. https://doi.org/10.3390/s25113498

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