Development of miniaturized antenna for implantable application

Abstract

In recent years the early diagnosis of disease and continuous monitoring features have been increased due to the advancement of healthcare techniques like wearable electronics, continuous miniaturization, biomedical devices and signal processing. But the hostile nature of the human body provides high loss and effect on the antenna elements for radio propagation. Henceforth this leads to intense performance degradation in implantable antenna performance. The main goal of this research is to plan and design a miniaturized implantable antenna operating at Industrial Scientific and Medical (ISM) bands. An effective design of implantable antenna demands miniaturized size, biocompatibility and improved radiation performance. newlineIn this research work, unique diminished circular maze shaped implantable antenna is developed for an medical application which is to be worked out in a medical band. For this work, the biocompatible polyamide substrate (Permittivity and#61541;r = 4.3 and tanand#945;= 0.004) with 0.05mm thickness is used as both substrate and superstrate. By using a circular maze shaped structure in the radiator, the designed antenna is presented with the best diminishment with the dimensions of (7mm × 7mm × 0.1mm). The designed antenna shows a maximum gain of -23 dB in a skin phantom model simulation at the frequency of 2.45 GHz. In a pork slab, a model of the designed antenna is fabricated and the measurements are conducted accordingly. The maximum SAR (Specific Absorption Rate) is evaluated for safety health consideration. The obtained margins are in the safe boundary and they satisfy IEEE C95.1-1999 and C95.1-2005 safety rules. The developed antenna has shown noticeable performance improvement compared to the previously designed antennas in terms of gain, return loss and SAR rate. newline