Abstract
This chapter gives an overview of three decades of technology development in surface acoustic wave (SAW) ultrasonics. SAW technology, as applied to modern electronic systems, was born with the concept of a thin-metal interdigital electrode transducer (IDT) on a polished piezoelectric plate and spent its youth exploring the limits of time and frequency domain signal processing functions. Since then it has matured as a manufacturing technology in consumer electronics, found economic success in frequency selectivity for telecommunications, and continues to grow and support a variety of wireless and sensor applications. Its secret to success has been the slow wave velocity accorded elastic waves, its accessibility to surface displacements and electric fields, its passive device nature, its high-frequency capability, the availability of a large dynamic range, and the simplicity of its manufacture. A technology with an explosive beginning, it has evolved into a respected and much needed component for time and frequency control in electronic systems and has a promising applications-filled future.
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