Ultrasound Transducer Design Based on Anti-Matching Layer Structure

The matching layer in ultrasound transducer design plays a crucial role in efficiently transmitting ultrasound waves, thereby significantly improving the performance of the transducers. Extensive research has been conducted on the design of matching layers due to their importance. Conversely, structures capable of suppressing acoustic waves are equally vital for transducer design. However, the mechanisms for acoustic wave suppression have not been thoroughly explored, leading to a lack of theoretical foundation and innovative design concepts for these application-specific transducers. In this article, we introduce a double-layer impedance anti-matching (AM) mechanism that identifies four cases of acoustic suppression. We validate the acoustic suppression performance of the AM structure through theoretical analysis, simulations, and experimental testing. Furthermore, we apply the double-layer AM structure in the design of an array ultrasound transducer and compare its performance with that of traditional transducers, presenting the AM structure as a novel approach to ultrasound transducer design.