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Dual band PIFA design for biomedical applications

In this study, numerical and experimental analysis of a dual band (Medical Implant Communications Service-MICS; 402-405 MHz, Industrial, Scientific and Medical-ISM; 2.4-2.48 GHz) implantable antenna design for biomedical applications are presented. The proposed antenna is in the type of stacked Planar Inverted-F Antenna (PIFA) covered with a superstrate. The antenna has a size of 2 cm × 1 cm × 3.81 mm. Numerical analysis of the implant antenna is carried out using High Frequency Structure Simulator (HFSS) software. The proposed antenna is fabricated and in vitro tested in skin phantom. It is shown that the antenna resonates at 403.5 MHz with a reflection coefficient of -23 dB, and a 10-dB bandwidth of 56 MHz, which covers the MICS band, moreover, it resonates at 2.45 GHz with a reflection coefficient of -22 dB, and a 10-dB bandwidth of 200 MHz, which covers the ISM band. The maximum simulated gain is found as -33 dBi and -13 dBi for MICS and ISM bands, respectively. Communication link measurements are performed using commercially available Microsemi-Zarlink Application Development Kit for Medical Telemetry (ZLE70102) in order to check the functioning of the proposed antenna. Designed antenna is inserted into the MICS band phantom and it is achieved to wake-up base station module at ISM band and to send data at the MICS band in 4 meter range.