Patent ID: 7023300
Filing Date: 2006-04-04
Classification: H03H

Abstract:
1. A SAW (surface wave) device comprising: a first input IDT (inter-digital transducer) and a first output IDT forming a first SAW filter, at least one of the IDTs of the first SAW filter having a slanted finger geometry for SAWs at a plurality of different wavelengths over an aperture of the IDT; and a second SAW filter comprising a second input IDT and a second output IDT; wherein the second SAW filter is similar to the first SAW filter except that it provides a 180 degree phase change, relative to the first SAW filter, for SAWs regenerated at the output IDT and returned to the input IDT, said 180 degree phase change being provided respectively for said plurality of different wavelengths; the second input IDT being connected in parallel with the first input IDT so that said regenerated SAWs substantially cancel one another at the input IDTs for said plurality of wavelengths over said aperture.