Accession Number : ADD013580

Title :   A SAW (Surface Acoustic Wave) Dispersive Delay Device.

Descriptive Note : Patent Application, Filed 24 Aug 87,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Mariani, Elio A

Report Date : 24 Aug 1987

Pagination or Media Count : 15

Abstract : A SAW dispersive delay device comprises a high-coupling piezoelectric substrate such as lithium niobate, and input and an output metallic transducer deposited on the piezoelectric substrate, and a pair of coextensive metallic reflective arrays deposited on the same substrate and respectively aligned with the transducers. The arrays comprise a number of shorted and open reflectors which are alternately interleaved. The reflectors are inclined substantially 45 deg with respect to the aligned transducer propagation direction. The periodicity of the reflectors varies along the length of each reflective array so that different frequencies are reflected at different locations along each array to thereby provide a different delay path. The periodicity variation is the same in the two arrays. The periodicity of these reflectors varies in a manner consistent with a prescribed dispersion characteristic.

Descriptors :   *ARRAYS, *DELAY CIRCUITS, *DISPERSING, *LITHIUM NIOBATES, *PIEZOELECTRIC MATERIALS, *REFLECTION, *REFLECTORS, *SUBSTRATES, *SURFACE ACOUSTIC WAVE DEVICES, *TRANSDUCERS, *PATENT APPLICATIONS, DELAY, DISPERSIONS, METALS, OUTPUT, PATHS, PROPAGATION, SURFACE ACOUSTIC WAVES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE