Abstract
A spiral-shape, multi-band and compact antenna for healthcare and high-speed biomedical devices is presented. It operates simultaneously at 2.4/5.8 GHz of the industrial scientific medical (ISM) band and 4.8 GHz as the first-band harmonic. Therefore, it is suitable for fully-passive in-body systems. The compact size of the designed antenna is 9.2 × 9.2 × 0.5 mm3 and shorting pins are not used to reduce the dimensions. The results have been checked by full wave software in both three-layer and one-layer phantoms with different body tissues. The presented antenna has been embedded in two implantable systems and integrated with other components to evaluate real working scenarios. In addition, for safety study and numerical analysis of radiation absorption per unit mass of human tissue, the antenna specific absorption rate (SAR) has been analyzed. The designed antenna has been implanted in a muscle liquid phantom and parameters were evaluated experimentally. The proposed antenna exhibits multi-band characteristics, has a via-less and simple configuration, a compact size, low SAR, and suitable gain value making it a proper and applicable choice for implantable passive devices.
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