Efficient Modeling of Transduction and Reflection Properties of Finite Aperiodic SAW Transducers

IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI:10.1109/ULTSYM.1985.198481

O. Manner, A. Baghai-Wadji, E. Ehrmann-Falkenau

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引用次数: 6

Abstract

Our paper describes the modeling of finite, aperiodic SAW transducers of arbitrary polarity sequence and phasing in the presence of reflections caused by field shorting and mass loading. Electrostatic interactions are described by a chargepotential interrelation (CPI) matrix, and the coupling to surface waves by a mixed nodal impedance/scattering (MNIS) formalism which completely accounts for electroacoustic interactions within the transducer. Starting with the solution of the electrostatic problem, we compute the acoustically induced charge distribution, the excited SAW, and the reflection coefficient, input conductance and susceptance of the IDT. The susceptance is obtained directly without the need of a Hilbert transform. By exploiting special properties of the CPI and MNIS matrices, we present an algorithm whose computer time and memory requirements increase only linearly with the finger count of the IDT. As an example, the Hanma-Hunsinger singlephase unidirectional transducer (SPUDT) configuration is analyzed and its tripletransit suppression performance evaluated. This SPUDT is of particular interest because it requires no extra metallization step.

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有限非周期SAW换能器的高效转导和反射特性建模

本文描述了在存在由场短路和质量载荷引起的反射的情况下，任意极性序列和相位的有限非周期SAW换能器的建模。静电相互作用由电荷电位相互关系(CPI)矩阵描述，与表面波的耦合由混合节点阻抗/散射(MNIS)形式描述，该形式完全解释了换能器内的电声相互作用。从解决静电问题开始，我们计算了声诱导电荷分布，激发声表面波，以及IDT的反射系数，输入电导和电纳。电纳直接得到，不需要希尔伯特变换。通过利用CPI和MNIS矩阵的特殊性质，我们提出了一种算法，其计算机时间和内存需求仅随IDT的手指数线性增加。以汉马-亨辛格单相单向换能器(SPUDT)为例，对其三次传输抑制性能进行了分析和评价。这种SPUDT特别有趣，因为它不需要额外的金属化步骤。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE 1985 Ultrasonics Symposium

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