Bandwidth, power and noise considerations in airborne cMUTs
Author
Şenlik, Muhammed N.
Olcum, Selim
Köymen, Hayrettin
Atalar, Abdullah
Date
2009-09Source Title
2009 IEEE International Ultrasonics Symposium - Proceedings
Print ISSN
1051-0117
Publisher
IEEE
Pages
438 - 441
Language
English
Type
Conference PaperItem Usage Stats
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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 transducerImpedance mismatch
Mechanical impedances
Radiation resistance
Transmit power
Transmitted power
Bandwidth
Noise figure
Transducers
Ultrasonics
Ultrasonic transducers