Design of a Capacitively Loaded Implantable Loop Antenna in the Cerebral Spinal Fluid

A capacitively loaded implantable loop antenna operating at 400 MHz is proposed for the implantation in the cerebral spinal fluid (CSF) above the brain. The specific absorption rate and temperature analysis were carried out to investigate the maximum input power for the implantable antenna without violating the safety considerations inside an anatomical realistic human head model. The implantable antenna achieves a maximum input power of 15.7 mW with 1 °C increase in the temperature of the human head tissue. Thus, the implantable antenna can be integrated with a low-power RF neural module.