The present invention relates to a high frequency surface acoustic wave
device, which may be manufactured by the same manufacturing equipment,
and with the same material, as those required for manufacturing a low
frequency surface acoustic wave device. The disclosed high frequency
surface acoustic wave device comprises: a piezoelectric substrate; a high
acoustic velocity layer formed on the surface of the piezoelectric
substrate whose acoustic velocity of the surface acoustic wave is larger
than 5000 m/sec; an input transducing part; and an output transducing
part; wherein the input transducing part and the output transducing part
are formed in pair on or below the surface of the high acoustic velocity
layer. Besides, the high acoustic velocity layer is preferably made of
aluminum oxide, and formed on the surface of the piezoelectric substrate
by an electron-beam evaporation process. The thickness thereof is
preferably between 2 .mu.m and 20 .mu.m.