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Keywords

Biomedical, Bandwidth, Miniaturized, Implantable antenna, Specific absorption rate

Document Type

Article

Abstract

This paper introduces a dual-band spiral-shaped implantable antenna engineered for medical applications, addressing the growing demand for reliable subcutaneous implantable monitoring systems. The proposed antenna is designed to operate within the Industrial, Scientific, and Medical (ISM) band centered at 2400 MHz, leveraging a highly compact form factor with total dimensions of 6 mm × 5 mm × 0.254 mm, yielding a minimal volumetric footprint of 7.62 mm3. The structure is fabricated on the RO3010 substrate, characterized by a relative permittivity of ϵr = 10.2, a loss tangent of tanδ= 0.0022, and a substrate thickness of 0.254 mm. Notable features of the antenna include its dual-band functionality, absence of a shorting pin in the ground layer, and a highly miniaturized profile. Performance metrics demonstrate a maximum gain of -15 dBi and an impressive bandwidth of 888 MHz at the 2.45 GHz resonance, underscoring its suitability for high-data-rate biotelemetry applications. Specific absorption rate (SAR) evaluations were conducted to ensure compliance with international safety standards, yielding values of 936 W/kg for 1-gram tissue and 98.6 W/kg for 10-gram tissue, confirming adherence to regulatory limits. Owing to its optimized electrical performance, compact architecture, and conformity to safety guidelines, the antenna represents a promising solution for advanced implantable medical devices.

DOI

10.30684/2412-0758.1017

First Page

352

Last Page

366

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