Wrap-around surface-wave delay lines

Abstract
Acoustic-surface-wave beams at 100 MHz have been circulated in multiple transits around the periphery of small lithiumniobate samples. A time delay of 22 μs per round-trip transit with propagation loss of 5.75 dB per round-trip transit has been observed. This has potential application to delay lines of very long delay using a helical path between input and output transducers, and to delay lines having lower insertion loss and triple-transit signals than conventional lines.

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