Saw filter and communication device utilizing a weighted reflector

摘要

A SAW filter includes at least two IDTs arranged along a SAW propagation direction on a piezoelectric substrate and first and second reflectors sandwiching the IDTs. A group of electrode fingers of each of the first and second reflectors is interdigital-width weighted. Further, a method of interdigital-width weighting of the electrode fingers of the first reflector is different from that of interdigital-width weighting of the electrode fingers of the second reflector.