Now showing items 1-12 of 12

    • Bilateral CMUT cells and arrays: equivalent circuits, diffraction constants, and substrate impedance 

      Köymen, H.; Atalar, Abdullah; Taşdelen, A. S. (Institute of Electrical and Electronics Engineers Inc., 2017)
      We introduce the large-signal and small-signal equivalent circuit models for a capacitive micromachined ultrasonic transducer (CMUT) cell, which has radiating plates on both sides. We present the diffraction coefficient ...
    • Calculation of transformer ratio in mason's equivalent circuit for cMUTs 

      Olcum, S.; Atalar, Abdullah; Köymen H.; Senlik, M.N. (2006)
      We present a new method to calculate the transformer ratio of a cMUT in Mason's Equivalent circuit model. The effect of the spring softening capacitance is also included in the analysis. We use the existing turns ratio ...
    • Design and implementation of a wireless passive sensing system for structural health monitoring 

      Özbey, Burak (Bilkent University, 2016-06)
      Structural health monitoring (SHM) aims to ensure detection and prevention of damage in structures and protection of human life via observation of certain damage indicators. In SHM, one of the most important damage indicators ...
    • Designing circular CMUT cells using CMUT biasing chart 

      Köymen, Hayrettin; Atalar, Abdullah; Oğuz, H. Kağan (IEEE, 2012-10)
      A very accurate equivalent circuit model for circular CMUT cell is recently proposed. As a consequence of this model, the operating characteristics of the cell is derived and presented as a biasing chart for CMUTs. We ...
    • An equivalent circuit for collapse operation mode of CMUTs 

      Olcum, S.; Yamaner F.Y.; Bozkurt, A.; Koymen H.; Atalar, Abdullah (2010)
      Collapse mode of operation of the capacitive mi-cromachined ultrasonic transducers (CMUTs) was shown to be a very effective way for achieving high output pressures. However, no accurate model exists for understanding the ...
    • An equivalent circuit model for nested split-ring resonators 

      Ozbey, B.; Altintas, A.; Demir, H. V.; Ertürk, V. B. (Institute of Electrical and Electronics Engineers Inc., 2017)
      In this paper, an equivalent circuit model for nested split-ring resonators (NSRRs) is proposed. NSRRs are an emerging class of split ring resonators, preferred in a range of areas from sensing in biomedical or civil ...
    • An equivalent circuit model for transmitting capacitive micromachined ultrasonic transducers in collapse mode 

      Olcum, S.; Yamaner, F. Y.; Bozkurt, A.; Köymen, H.; Atalar, Abdullah (IEEE, 2011)
      The collapse mode of operation of capacitive micromachined ultrasonic transducers (CMUTs) was shown to be a very effective way to achieve high output pressures. However, no accurate analytical or equivalent circuit model ...
    • Equivalent circuit-based analysis of CMUT cell dynamics in arrays 

      Oğuz, H. K.; Atalar, Abdullah; Köymen, H. (IEEE, 2013)
      Capacitive micromachined ultrasonic transducers (CMUTs) are usually composed of large arrays of closely packed cells. In this work, we use an equivalent circuit model to analyze CMUT arrays with multiple cells. We study ...
    • An improved lumped element nonlinear circuit model for a circular CMUT cell 

      Koymen, H.; Atalar, Abdullah; Aydogdu, E.; Kocabas, C.; Oguz, H. K.; Olcum, S.; Ozgurluk, A.; Unlugedik, A. (IEEE, 2012)
      This paper describes a correction and an extension in the previously published large signal equivalent circuit model for a circular capacitive micromachined ultrasonic transducer (CMUT) cell. The force model is rederived ...
    • A novel equivalent circuit model for CMUTs 

      Oguz H.K.; Olcum, S.; Senlik, M.N.; Atalar, Abdullah; Köymen H. (2009)
      A nonlinear equivalent circuit for immersed transmitting capacitive micromachined ultrasonic transducers (CMUTs) is presented. The velocity profile across the CMUT surface maintains the same form over a wide frequency ...
    • Parametric nonlinear lumped element model for circular CMUTs in collapsed mode 

      Aydoǧdu, E.; Ozgurluk, A.; Atalar, Abdullah; Köymen, H. (2014)
      We present a parametric equivalent circuit model for a circular CMUT in collapsed mode. First, we calculate the collapsed membrane deflection, utilizing the exact electrical force distribution in the analytical formulation ...
    • VHF suspended plate transmitter antenna design for DVB-T and DAB-T 

      Ali, A.; Ciydem, M.; Altintas, A.; Koc, S. (John Wiley and Sons, 2018)
      This paper presents the design of stacked suspended plate transmitter antenna for digital video and audio broadcasting. Contrary to conventional dipole structures, we have designed the antenna in VHF band (174-254 MHz) ...