Abstract
The operation of harmonic SAW delay lines up to 2 GHz has previously been reported [l], [2], using stepped- finger interdigital transducers (IDT) without sub-micron IDT fingers. These IDT's employed single-electrode finger geometries. Here, we examine the second-order distortion of the (sin X)/X passband response of such structures, as exemplified for a 1 GHz 5th harmonic delay line. From time-gated impulse response observations, the primary source of this passband distortion is attributed to finger reflections from the single-electrode IDT's, rather then to electromagnetic feedthrough. Illustrative experiments subsequently conducted on a 5th harmonic delay line with double-electrode IDT's confirmed this observation.
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