Metamaterial-based wireless RF-MEMS strain sensors
Author
Melik, Rohat
Ünal, Emre
Perkgoz, Nihan Kosku
Puttlitz, C.
Demir, Hilmi Volkan
Date
2010Source Title
SENSORS, 2010 IEEE
Publisher
IEEE
Pages
2173 - 2176
Language
English
Type
Conference PaperItem Usage Stats
136
views
views
116
downloads
downloads
Abstract
Approximately 10% of the fractures do not heal properly because of the inability to monitor fracture healing. Standard radiography is not capable of discriminating whether bone healing is occurring normally or aberrantly. We propose and develop an implantable wireless sensor that monitors strain on implanted hardware in real time telemetrically. This enables clinicians to monitor fracture healing. Here we present the development and demonstration of metamaterial-based radiofrequency (RF) micro-electro-mechanical system (MEMS) strain sensors for wireless strain sensing to monitor fracture healing. The operating frequency of these sensors shifts under mechanical loading; this shift is related to the surface strain of the implantable test material. In this work, we implemented metamaterials in two different architectures as bio-implantable wireless strain sensors for the first time. These custom-design metamaterials exhibit better performance as sensors than traditional RF structures (e.g., spiral coils) because of their unique structural properties (splits). They feature a low enough operating frequency to avoid the background absorption of soft tissue and yield higher Q-factors compared to the spiral structures (because their gaps have much higher electric field density). In our first metamaterial architecture of an 5x5 array, the wireless sensor shows high sensitivity (109kHz/kgf, 5.148kHz/microstrain) with low nonlinearity-error (<200microstrain). Using our second architecture, we then improved the structure of classical metamaterial and obtained nested metamaterials that incorporate multiple metamaterials in a compact nested structure and measured strain telemetrically at low operating frequencies. This novel nested metamaterial structure outperformed classical metamaterial structure as wireless strain sensors. By employing nested metamaterial architecture, the operating frequency is reduced from 529.8 MHz to 506.2 MHz while the sensitivity is increased from 0.72 kHz/kgf to 1.09 kHz/kgf. ©2010 IEEE.
Keywords
MetamaterialNested metamaterials
Remote sensing
RF-MEMS
Sensitivity
Split ring resonator
Strain
Nested metamaterials
Resonance frequency
RF-MEMS
Sensitivity
Split ring resonator
Architecture
Composite micromechanics
Electric fields
Fracture
Metamaterials
Microelectromechanical devices
Natural frequencies
Optical resonators
Radiology
Remote sensing
Electronic equipment
Permalink
http://hdl.handle.net/11693/28438Published Version (Please cite this version)
http://dx.doi.org/10.1109/ICSENS.2010.5690582Collections
Related items
Showing items related by title, author, creator and subject.
-
How to design and characterize metal-dielectric based metamaterials: experimental demonstrations of metamaterial applications at the millimeter-wave regime
Alıcı, Kamil Boratay; Özbay, Ekmel (OSA, 2008-10)In the present work, after detailed explanation of the metamaterials design methods, we demonstrate two different double negative metamaterial media and their properties in terms of radiation and negative refaraction at ... -
Novel wireless RF-bioMEMS implant sensors of metamaterials
Melik, Rohat (Bilkent University, 2010)Today approximately one out of ten patients with a major bone fracture does not heal properly because of the inability to monitor fracture healing. Standard radiography is not capable of discriminating whether bone healing ... -
Waveguiding of electromagnetic waves and investigation of negative phase velocity in photonic crystals and metamaterials
Çolak, İlyas Evrim (Bilkent University, 2012)Electromagnetic wave propagation is characterized in periodic dielectric and metallic structures: Photonic Crystals (PCs) and Metamaterials, respectively. The applications of these structures are demonstrated in ...