A meandered and a spiral stacked circular planar inverted-F antennas (PIFAs) are proposed for integration into head-implantable biomedical devices and wireless biotelemetry in the 402-405 MHz Medical Implant Communications Service (MICS) band. Designs only differ in the patch shape, feed, and shorting pin positions, while emphasis is given on miniaturization and biocompatibility. Phantom-related resonance detuning issues are addressed, and the PIFAs' radiation performance (radiation pattern, specific absorption rate (SAR) conformance with international guidelines, SAR distribution, and quality of up-link communication with exterior monitoring equipment) is evaluated and compared. Finite Difference Time Domain (FDTD) numerical simulations are performed.
['Asimina Kiourti', 'Konstantina S. Nikita']
Meandered versus Spiral Novel Miniature PIFAs Implanted in the Human Head: Tuning and Performance