Compact Meander Tapered Patch Antenna for Wireless Biomedical Telemetry

The design of an implantable equilateral triangle patch antenna is presented. The patch is tapered with narrow slits to meander the current path to lower the resonant frequency to 402MHz. By changing the length and width of narrow slits and adding a shortening pin, a compact size of the antenna is achieved, which is around 141mm(3). Two implantation setups are considered. The antenna has been initially designed inside a skin cube and a 3-D spherical head model taking into account the effect of exterior air. The performance of the antenna is characterized in terms of the reflection coefficient, the far field radiation pattern, the specific absorption rate (SAR) as well as the axial ratio for both implantation setups.