Surface acoustic wave resonator, surface acoustic wave filter and surface acoustic wave duplexer, and communications equipment
AssigneeKYOCERA Corporation
InventorsMasayuki Funami, Yuuko Yokota, Kiyohiro Iioka
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Abstract
Disclosed is a surface acoustic wave resonator which comprises, on a piezoelectric substrate 19, an IDT electrode 1 including bus bar electrodes 12a, reflector electrodes 2 disposed to be adjacent to both sides of the IDT electrode 1 in a main propagation direction F of surface acoustic waves at the IDT electrode 1, and auxiliary reflector electrodes 3 that are disposed at four positions external to the reflector electrodes 2 on virtual straight lines extending from the bus bar electrodes 12a of the IDT electrode 1 in an inclined manner so that the periodic direction G of periodically arranged electrodes 14b is oriented toward the IDT electrode 1.
Claims17
A surface acoustic wave resonator comprising:
- a piezoelectric substrate;
- an IDT electrode on the piezoelectric substrate, including a bus bar electrode substantially in parallel to a direction along which a surface acoustic wave propagates;
- reflector electrodes on the piezoelectric substrate, adjacent to both sides of the IDT electrode in the direction;
- and
- an auxiliary reflector electrode on the piezoelectric substrate, including a plurality of grating electrodes and disposed on a virtual straight line extending from the bus bar electrode of the IDT electrode, the auxiliary reflector electrode being more distant from the IDT electrode than the reflector electrode.
Dependencies are inferred from the claim text.