Surface acoustic wave devices
AssigneeBritish Secretary of State for Defence
InventorEdward George Sydney Paige
Life of this patent
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Abstract
A surface acoustic wave device comprises a piezoelectric substrate which carries input and output transducers for launching and receiving surface acoustic waves on the substrate, one or more reflective arrays for reflecting surface acoustic waves between the two transducers, wherein at least one array comprises numerous spaced reflecting elements of varying lengths arranged in two sets, one set being angled to reflect surface acoustic wave in one direction while the other set is angled to reflect surface acoustic wave in another direction. Varying the lengths of the reflecting elements provides weighting of signals passing through the device. Additionally pulse compression and expansion may be arranged with or without frequency dispersion.
Claims11
A surface acoustic wave device comprising a substrate able to support surface acoustic waves, a transducer for launching surface acoustic waves in a track on the substrate, a transducer for receiving surface acoustic waves from a track on the substrate, the substrate having piezo-electric regions at least at the transducers, and a first reflective array structure having two sets of varying length reflecting elements arranged across a surface acoustic wave track, one set angled to reflect some of the surface acoustic waves in the track into one direction and the other set angled to reflect some of the surface acoustic waves in the track into another direction.
A surface acoustic wave device comprising a piezoelectric substrate carrying an input and output transducer, a first reflective array structure for receiving surface acoustic waves from the input transducer and reflecting them into a second reflecting array arranged to reflect the surface acoustic waves into the output transducer, each array comprising several reflecting elements spaced parallel to one another, and wherein at least one of the arrays has two sets of reflecting elements one set angled to reflect surface acoustic waves between the two arrays and the other set angled to reflect surface acoustic waves away from the arrays.
Dependencies are inferred from the claim text.