TY - JOUR A2 - Ferrara, Flaminio AU - Khan, M. Waqas A. AU - Moradi, Elham AU - Sydänheimo, Lauri AU - Björninen, Toni AU - Rahmat-Samii, Yahya AU - Ukkonen, Leena PY - 2017 DA - 2017/01/10 TI - Miniature Coplanar Implantable Antenna on Thin and Flexible Platform for Fully Wireless Intracranial Pressure Monitoring System SP - 9161083 VL - 2017 AB - Minimally invasive approach to intracranial pressure monitoring is desired for long-term diagnostics. The monitored pressure is transmitted outside the skull through an implant antenna. We present a new miniature (6 mm × 5 mm) coplanar implant antenna and its integration on a sensor platform to establish a far-field data link for the sensor readout at distances of 0.5 to 1 meter. The implant antenna was developed using full-wave electromagnetic simulator and measured in a liquid phantom mimicking the dielectric properties of the human head. It achieved impedance reflection coefficient better than −10 dB from 2.38 GHz to 2.54 GHz which covers the targeted industrial, scientific, and medical band. Experiments resulted in an acceptable peak gain of approximately −23 dBi. The implant antenna was submerged in the liquid phantom and interfaced to a 0.5 mW voltage controlled oscillator. To verify the implant antenna performance as a part of the ICP monitoring system, we recorded the radiated signal strength using a spectrum analyzer. Using a half-wavelength dipole as the receiving antenna, we captured approximately −58.7 dBm signal at a distance of 1 m from the implant antenna which is well above for the reader with sensitivity of −80 dBm. SN - 1687-5869 UR - https://doi.org/10.1155/2017/9161083 DO - 10.1155/2017/9161083 JF - International Journal of Antennas and Propagation PB - Hindawi KW - ER -