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Impact of multiple tissue layers on an implantable LC sensor
Author(s) -
Yvanoff Marie,
Venkataraman Jayanti,
Fuller Lynn
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23216
Subject(s) - capacitance , microwave , capacitor , materials science , specific absorption rate , biotelemetry , antenna (radio) , frequency shift , capacitance probe , optoelectronics , absorption (acoustics) , electronic engineering , electrical engineering , acoustics , engineering , physics , telecommunications , optics , electrode , telemetry , voltage , composite material , quantum mechanics
Abstract The impact of multiple tissue layers in a biotelemetry link consisting of a single loop antenna and an implantable LC sensor is investigated through simulation and measurements. The shift in resonant frequency due to the dispersive media encapsulating the sensor is analyzed. It is seen that the resonant frequency is strongly affected by the properties of the first layer, whereas additional layers prove to have little to no effect. Further, the capacitance values as well as the type of capacitor play a dominant role on the shift in the resonant frequency. It is demonstrated that smaller capacitance values would be required for determining the properties of the tissue region in which the sensor is embedded. The complexity of the multiple tissue layers is shown to be important in determining specific absorption rate (SAR) levels. An experimental validation has been done by immersing a LC sensor in single and multiple dispersive regions. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 783–787, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23216