Abstract
A grating structure serves as the most fundamental element of inter-digital transducers (IDTs). IDTs are used for excitation and detection of surface acoustic waves (SAW) in Ultra wide band (UWB) SAW devices. Reflections on the metal fingers greatly affect the functionality of IDTs, and thus that of the SAW devices they are used in. Hence, this effect has been studied extensively and several models and theories have been proposed for this purpose. The signal properties of IDT devices can be controlled by varying several parameters like the number of fingers (electrodes) of the IDT or the spatial distribution of the pitch of the array of fingers. Here, we wish to study the generation and propagation of SAW inside a chirped IDT.
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