A Miniaturized Elliptical Patch Antenna for Implantable Wireless Biotelemetry Applications at 2.45 GHz

Implantable antennas are essential for wireless biotelemetry, enabling real-time health monitoring and effective communication between medical implants and external devices. This paper presents the design and simulation of a miniaturized elliptical patch antenna operating at 2.45 GHz for implantable wireless biotelemetry applications. The antenna is designed using Rogers 6010 as the substrate for enhanced compactness, with an inset feed configuration to achieve effective impedance matching. Length variations and the incorporation of slots in the fully grounded ground plane were explored to optimize impedance matching, resulting in an improved S11 of -42 dB. Simulations were conducted in CST Microwave Studio in free space, focusing on return loss, radiation patterns, and radiation efficiency. The proposed antenna demonstrates excellent impedance matching and a compact form factor but exhibits low radiation efficiency due to its miniature dimensions. Future work will include performance evaluation in skin-mimicking environments for biomedical applications.