Patent ID: 7889025

Claim:
An anti-reflective acoustic diffusion acoustic wave device, comprising: an acoustic wave substrate hosts at least one interdigitated transducer; said substrate having a surface with at least one end; an anti-reflective acoustic diffusion apparatus is positioned on said end; said transducer propagates an incident acoustic wave toward said diffusion apparatus; said diffusion apparatus further comprising a group of irregularly dimensioned diffusing elements being substantially irregular with respect to at least one of size, shape, composition, and location; said acoustic wave being diffused into a plurality of scattered reflected waves when encountering said diffusion apparatus; and said plurality of scattered reflected waves, having a nearly uniform distributed acoustic energy with a random phase, eliminate a plurality of unwanted acoustic reflections from said diffusion apparatus and an acoustic cross-talk from a surface wave leakage to allow an improved acoustic wave device performance without any increase in the size of said substrate; each of said plurality of scattered waves being statistically random with respect to each other; said diffusion apparatus providing both an isolation of any given SAW device from acoustic waves generated by another SAW device on the same substrate and an anti-reflection; the anti-reflective acoustic diffusion acoustic wave device further comprising: said at least one interdigitated transducer being a plurality of interdigitated transducers; said diffusion apparatus being positioned on a plurality of unoccupied substrate regions between and surrounding said plurality of interdigitated transducers; said plurality of unoccupied substrate regions allowing a plurality of unobstructed external circuit connections; and said plurality of interdigitated transducers being connected to said plurality of external connections by a plurality of metallization regions; the anti-reflective acoustic diffusion acoustic wave device further comprising: said acoustic wave being a surface acoustic wave propagated by a surface acoustic wave device; and said plurality of scattered reflected waves being primarily a plurality of surface acoustic waves; and the anti-reflective acoustic diffusion acoustic wave device further comprising said plurality of scattered reflected waves including a plurality of bulk acoustic waves.