Now showing items 1-11 of 11

    • Bio-implantable passive on-chip RF-MEMS strain sensing resonators for orthopaedic applications 

      Melik, R.; Perkgoz, N. K.; Unal, E.; Puttlitz, C.; Demir, Hilmi Volkan (Institute of Physics Publishing Ltd., 2008)
      One out of ten bone fractures does not heal properly due to improper load distribution and strain profiles during the healing process. To provide implantable tools for the assessment of bone fractures, we have designed ...
    • Circular high-Q resonating isotropic strain sensors with large shift of resonance frequency under stress 

      Melik, R.; Unal, E.; Perkgoz, N.K.; Puttlitz, C.; Demir, Hilmi Volkan (2009)
      We present circular architecture bioimplant strain sensors that facilitate a strong resonance frequency shift with mechanical deformation. The clinical application area of these sensors is for in vivo assessment of bone ...
    • Design and realization of a fully on-chip High-Q resonator at 15 GHz on silicon 

      Melik, R.; Perkgoz, N. K.; Unal, E.; Dilli, Z.; Demir, Hilmi Volkan (Institute of Electrical and Electronics Engineers, 2008-12)
      We develop and demonstrate an on-chip resonator working at 15 GHz with a high quality factor (Q-factor) of 93.81 while only requiring a small chip size of 195 mu m x 195 mu m on Si by using our new design methodology. In ...
    • Development and biocompatibility characterization of a biomems sensor for monitoring the progression of fracture healing 

      Santoni, B. G.; Melik, R.; Ünal, Emre; Perkgöz, N. K.; Kamstock, D. A.; Ryan, S. D.; Dernell W. S.; Demir, Hilmi Volkan; Puttlitz, C. M. (2009-06)
      Orthopaedic extremity injuries present a large medical and financial burden to the United States and world-wide communities [1]. Approximately six million long bone fractures are reported annually in the United States and ...
    • Flexible metamaterials for wireless strain sensing 

      Melik, R.; Unal, E.; Perkgoz, N. K.; Puttlitz, C.; Demir, Hilmi Volkan (American Institute of Physics, 2009-11-04)
      We proposed and demonstrated flexible metamaterial-based wireless strain sensors that include arrays of split ring resonators (SRRs) to telemetrically measure strain. For these metamaterial sensors, we showed that a flexible ...
    • Implementation of high quality-factor on-chip tuned microwave resonators at 7GHz 

      Melik, R.; Demir, Hilmi Volkan (WILEY, 2009)
      We report on the design, analytical modeling, numerical simulation, fabrication, and experimental characterization of chip-scale microwave resonators that exhibit high quality-factors (Q-factors) in the microwave frequency ...
    • Metamaterial based telemetric strain sensing in different materials 

      Melik, R.; Unal, E.; Perkgoz, N.K.; Puttlitz, C.; Demir, Hilmi Volkan (Optical Society of American (OSA), 2010)
      We present telemetric sensing of surface strains on different industrial materials using split-ring-resonator based metamaterials. For wireless strain sensing, we utilize metamaterial array architectures for high sensitivity ...
    • Metamaterial-based wireless strain sensors 

      Melik, R.; Unal, E.; Perkgoz, N. K.; Puttlitz, C.; Demir, Hilmi Volkan (American Institute of Physics, 2009-07-07)
      We proposed and demonstrated metamaterial-based strain sensors that are highly sensitive to mechanical deformation. Their resonance frequency shift is correlated with the surface strain of our test material and the strain ...
    • Nested metamaterials for wireless strain sensing 

      Melik, R.; Unal, E.; Perkgoz, N. K.; Santoni, B.; Kamstock, D.; Puttlitz, C.; Demir, Hilmi Volkan (IEEE, 2009-12-28)
      We designed, fabricated, and characterized metamaterial-based RF-microelectromechanical system (RF-MEMS) strain sensors that incorporate multiple split ring resonators (SRRs) in a compact nested architecture to measure ...
    • Real-Time In Vivo Control of Neural Membrane Potential by Electro-Ionic Modulation 

      Soybas, Z.; Şimşek, S.; Erol, F. M. B.; Erdogan, U. Ç.; Şimşek, E. N.; Şahin, B.; Marçalı, M.; Aydogdu, B.; Elbüken, Çağlar; Melik, R. (Elsevier, 2019)
      Theoretically, by controlling neural membrane potential (Vm) in vivo, motion, sensation, and behavior can be controlled. Until now, there was no available technique that can increase or decrease ion concentration in vivo ...
    • RF-MEMS load sensors with enhanced Q-factor and sensitivity in a suspended architecture 

      Melik, R.; Unal, E.; Perkgoz, N. K.; Puttlitz, C.; Demir, Hilmi Volkan (Elsevier, 2010-11-09)
      In this paper, we present and demonstrate RF-MEMS load sensors designed and fabricated in a suspended architecture that increases their quality-factor (Q-factor), accompanied with an increased resonance frequency shift ...