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A polynomial approximation is proposed for the mutual acoustic impedancebetween uncollapsed capacitive micromachined ultrasonic transducer (CMUT) cellswith different radii in an infinite rigid baffle. The resulting approximationis employed in simulating CMUTs with a circuit model. A very good agreement isobtained with the corresponding finite element simulation (FEM) result.

Mutual Radiation Impedance of Uncollapsed CMUT Cells with Different Radii