Design And Analysis Of An Implantable Microstrip Patch Antenna For Medical Applications

Résumé: In this work, a dual band Microstrip patch implantable antenna for biomedical applications has been presented to operate in both Medical Implant Communications Service (MICS) with a range of 402-405 MHz and 2.4-2.5 GHz band chosen among the Industrial Scientific and Medical (ISM). A rectangular antenna has been first simulated to operate in MICS band with dimensions of 179.7 x 228.3 x 1.63 mm, then, a new meandered serpentine shape, with single feed point, has been used in order to lengthen the current path and covers both MICS and ISM bands with new dimensions of 31 x 25 x 1.63 mm printed on dielectric material of 4.3 constant. The proposed antenna resonates at 403 MHz with a reflection coefficient of -13 dB with a bandwidth of 2.25 MHz, and at 2.47 GHz with a -16.9 dB reflection coefficient and of 5 MHz bandwidth. Furthermore, the radiated fields are broadside at both frequencies with acceptable gains. The results of the proposed structure are validated experimentally although the dielectric constant of the used material is altered by the environmental effects. In order to test the usability of the antenna inside the human body, approximate media have been proposed. In vitro experiments have been conducted, where the antenna is packaged, then embedded into three different tissues. Results from these investigations are evaluated in terms of the tissues impact on the antenna’s propagation. Based on the obtained results, conclusions about adjusting the design to meet each medical application’s requirement have been deduced and a plan concerning the future work has been drawn in order to come up with the most miniaturized antenna that transmits reliable data from the human body to the base station at both MICS and ISM bands.

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