Patent ID: 7304553

Claim:
A component operating with surface-proximal acoustic waves, said component comprising: at least three interdigital transducers being arranged on a surface of a piezoelectric substrate, said interdigital transducers being respectively provided with a first and a second electrical connection and being electrically circuited with one another via said first and second electrical connections, so that the interdigital transducers are selected from serial and parallel interdigital transducers; at least one serial interdigital transducer being arranged in at least one serial branch serving as a signal path, said at least one serial branch connecting an input and an output of the component and in which all elements contained therein are electrically connected in series; at least one parallel branch in which is arranged a parallel interdigital transducer being connected parallel thereto against a reference potential; at least one of the serial or parallel interdigital transducers being arranged in series with an additional interdigital transducer in a propagation direction of the acoustic wave, so that both interdigital transducers are acoustically coupled with one another, so that the transducers coupling with each other differ from each other by at least one of the following features selected from a group consisting of: a) the interdigital transducers possessing a different aperture, b) the interdigital transducers possessing a different pitch, c) the interdigital transducers belong to different branches of the component, d) of the interdigital transducers, at least one is arranged in the serial branch and the transducers being not directly electrically connected with one another, e) the interdigital transducers comprising a different number of interdigital electrode fingers, f) the interdigital transducers exhibiting a different metallization ratio, and g) the interdigital transducers being weighted and exhibiting a different weighting; and both coupled interdigital transducers being arranged in a serial branch.