Abstract
We present a meandered triple-band planar-inverted-F antenna (PIFA) for integration into brain-implantable biotelemetric systems. The target applications are wireless data communication, far-field wireless power transfer, and switching control between sleep/wake-up mode at the Medical Device Radiocommunication Service (MedRadio) band (401–406 MHz) and Industrial, Scientific and Medical (ISM) bands (902–928 MHz and 2400–2483.5 MHz), respectively. By embedding meandered slots into the radiator and shorting it to the ground, we downsized the antenna to the volume of 11 × 20.5 × 1.8 mm3. We optimized the antenna using a 7-layer numerical human head model using full-wave electromagnetic field simulation. In the simulation, we placed the implant in the cerebrospinal fluid (CSF) at a depth of 13.25 mm from the body surface, which is deeper than in most works on implantable antennas. We manufactured and tested the antenna in a liquid phantom which we replicated in the simulator for further comparison. The measured gain of the antenna reached the state-of-the-art values of −43.6 dBi, −25.8 dBi, and −20.1 dBi at 402 MHz, 902 MHz, and 2400 MHz, respectively.
Highlights
Implantable wireless medical devices are a major focus of health technology development. ey enable the minimally intrusive long-term monitoring and management of medical conditions [1,2,3,4,5,6,7]. is conception has sparked the research on antennas and wireless technology that meets the demands of modern medical applications [1,2,3,4,5,6], and multiple frequency bands have become available for wireless implant communications
We set the thickness of the dura layer to 0.5 mm. e thicknesses of the skull and the width of the subarachnoid space (SAS) are filled with the cerebrospinal fluid (CSF) depend upon the individual and the location. us, we followed our previous approach [37], where we established averaged values for the thickness of the skull and CSF layers based on the dimensions measured from the cross section slices of the anatomical head model of an adult male provided by ANSYS. e simulation utilized frequency-dependent electrical properties of the head tissues
Wireless brain care that is based on medical implants is a novel approach in the biomedical field
Summary
Small Triple-Band Meandered PIFA for Brain-Implantable Biotelemetric Systems: Development and Testing in a Liquid Phantom. We present a meandered triple-band planar-inverted-F antenna (PIFA) for integration into brain-implantable biotelemetric systems. We optimized the antenna using a 7-layer numerical human head model using full-wave electromagnetic field simulation. We placed the implant in the cerebrospinal fluid (CSF) at a depth of 13.25 mm from the body surface, which is deeper than in most works on implantable antennas. We manufactured and tested the antenna in a liquid phantom which we replicated in the simulator for further comparison. E measured gain of the antenna reached the state-of-the-art values of −43.6 dBi, −25.8 dBi, and −20.1 dBi at 402 MHz, 902 MHz, and 2400 MHz, respectively We manufactured and tested the antenna in a liquid phantom which we replicated in the simulator for further comparison. e measured gain of the antenna reached the state-of-the-art values of −43.6 dBi, −25.8 dBi, and −20.1 dBi at 402 MHz, 902 MHz, and 2400 MHz, respectively
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