SURFACE ACOUSTIC WAVE DEVICE

摘要

A SURFACE ACOUSTIC WAVE DEVICE WHICH CAN GENERATE SURFACE ACOUSTIC WAVES IN AT LEAST TWO DIRECTIONS.THE DEVICE INCLUDES A PIEZOELECTRIC LAYER (17), AN ELASTIC SUBSTRATE (20) AND AN ELECTRODE LAYER WHICH INCLUDES TWO ARRAYS (23, 24) OF LINEAR ELECTRODES WITH GAP REGIONS (25) LOCATED BETWEEN THE ELECTRODES. ALTERNATIVELY, THE ELECTRODE LAYER MAY BE PATTERNED AS AN ARRAY OF CONCENTRIC ANNULAR STRIPS (26, 27, 28) FOR THE GENERATION OF ANNULAR SURFACE ACOUSTIC WAVES.(FIG 5)