Work

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

Year: 2025

Type: article

Abstract: This paper presents the effects of effective dielectric properties of human torso on carrier-link-margin (CLM) and data-link-margin (DLM) of an experimentally validated miniaturized corner-chamfered meander-line implantable antenna placed within an implantable system prototype consisting of battery, PCB, camera and sensor encapsulated by biocompatible gelatin at 2.5 GHz. Specific Absorption Rate (SAR) and link margin performances of the implanted antenna are analyzed for 2500 scenarios (±20% variations in reference to the mean values of the effective relative permittivity, ɛeff, and conductivity, σeff, of the human body). For accurate dependence analyses, an artificial neural network (ANN) with two input variables (ɛeff, σeff) and five output variables (SAR_1g, SAR_10g, fractional bandwidth, CLM and DLM) is trained by 80% and tested by 20% of the total scenarios. Compared with the reference effective electrical properties of the homogeneous human body model, respective maximum variations of 63%, 41.6%, 17.97%, 26.79%, and 5.89% are observed in 1 g SAR value, 10 g SAR value, fractional bandwidth, CLM and DLM at 4 m distance for 100 Kbps. This work pioneers accurate dependences of link margins of body-implantable antenna system on effective relative permittivity and conductivity analyses.

Source: Sensors

DOI: 10.3390/s25113498

Authors: Soham Ghosh, Sunday C. Ekpo, Fanuel Elias, Stephen Alabi, Bhaskar Gupta

Institutions: Jadavpur University, Manchester Metropolitan University

Language: English

Topic: Wireless Body Area Networks

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $3,137