Patent ID: 6498548
Filing Date: 2002-12-24
Classification: H03H

Abstract:
A surface acoustic wave filter having interdigital electrodes formed on a piezoelectric substrate, the surface acoustic wave filter comprising:an interdigital transducer having interdigital electrodes; and reflectors arranged on the outside of said transducer, wherein a ratio h/&lgr; of thickness h of the interdigital electrodes to wavelength &lgr; lies within the range of 0.05&lE;h/&lgr;&lE;0.15, a ratio wr/pr of a reflector electrodes width wr to an electrode pitch pr lies within the range of 0.5&lE;wr/pr<0.6, and a ratio wi/pi of an interdigital electrode width wi to a pitch pi lies within the range of 0.6&lE;wi/pi &lE;0.9.