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      Bandwidth, power and noise considerations in airborne cMUTs

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      Author
      Şenlik, Muhammed N.
      Olcum, Selim
      Köymen, Hayrettin
      Atalar, Abdullah
      Date
      2009-09
      Source Title
      2009 IEEE International Ultrasonics Symposium - Proceedings
      Print ISSN
      1051-0117
      Publisher
      IEEE
      Pages
      438 - 441
      Language
      English
      Type
      Conference Paper
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      Abstract
      Capacitive micromachined ultrasonic transducers (cMUTs) offer wider bandwidth in air due to their low mechanical impedances. The impedance mismatch between the air and transducer decreases with the smaller device dimensions increasing the bandwidth at the expense of the degradation in the transmit power and the receive sensitivity. In this work, the bandwidth of cMUT is optimized by increasing its radiation resistance. This is done by properly choosing the size of cMUT membranes and their placement within an array. This selection not only brings an improvement in the transmitted power when it is used as a transmitter, but also improves the noise figure when it is used as a receiver. A further improvement in the noise figure is possible when the cells are clustered and connected to separate receivers. ©2009 IEEE.
      Keywords
      Capacitive micromachined ultrasonic transducer
      Impedance mismatch
      Mechanical impedances
      Radiation resistance
      Transmit power
      Transmitted power
      Bandwidth
      Noise figure
      Transducers
      Ultrasonics
      Ultrasonic transducers
      Permalink
      http://hdl.handle.net/11693/28632
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/ULTSYM.2009.5441775
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      • Department of Electrical and Electronics Engineering 3524
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