Design of circularly polarized implantable antenna for wireless intracranial pressure monitoring system

2021 ◽  
Author(s):  
Wenjie Cui ◽  
Ziwei Li ◽  
Chao Fan ◽  
Mengjun Wang ◽  
Hongxing Zheng ◽  
...  
Keyword(s):  
Intracranial Pressure ◽  
Monitoring System ◽  
Intracranial Pressure Monitoring ◽  
Pressure Monitoring ◽  
Circularly Polarized ◽  
Implantable Antenna

scholarly journals Miniature Coplanar Implantable Antenna on Thin and Flexible Platform for Fully Wireless Intracranial Pressure Monitoring System

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
M. Waqas A. Khan ◽  
Elham Moradi ◽  
Lauri Sydänheimo ◽  
Toni Björninen ◽  
Yahya Rahmat-Samii ◽  
...  
Keyword(s):  
Intracranial Pressure ◽  
Monitoring System ◽  
Human Head ◽  
Intracranial Pressure Monitoring ◽  
Voltage Controlled Oscillator ◽  
Pressure Monitoring ◽  
Invasive Approach ◽  
Antenna Performance ◽  
Half Wavelength ◽  
Implantable Antenna

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.

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