Abstract
In this work, a high-frequency lead-free ultrasonic transducer was designed and fabricated based on high-performance (K0.44Na0.56)NbO3-0.5mol%Mn (Mn-KNN) piezoelectric single crystal. The Krimholtz, Leedom, and Mattaei (KLM) equivalent circuit model was utilized to simulate and optimize the pulse-echo response combined with PiezoCAD software. Theoretically a ∼20MHz medical ultrasonic transducer with an optimized bandwidth up to 85.1% was obtained. The experimental results exhibited a center frequency of 20.9MHz with −6dB bandwidth of 65.3%. The excellent acoustic performance makes this lead-free single-crystal transducer potential for practical applications.
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