Design and analysis of innovative multi-frequency ultrasonic probe characteristics.

This study presents the development of a novel multifrequency ultrasound probe distinguished by its broad bandwidth and high sensitivity. A comprehensive investigation was conducted using theoretical analysis, numerical simulations, and experimental validation to characterize the probe's multiband performance through the effective electromechanical coupling coefficient (ECCt). The probe satisfies the bandwidth requirements for skin tissue detection, demonstrating potential for applications such as automated injections. Finite element simulations were employed to determine the resonance conditions of the layered piezoelectric structure, informing the probe's design and fabrication process. Impedance analysis identified resonant frequencies at 1.70, 2.44, 3.10, 4.53 and 7.16 MHz. The probe exhibited a linear acoustic response exceeding 5 MPa and achieved an electromechanical coupling coefficient below 0.5, underscoring its superior penetration capability and overall performance.