Patent ID: 7800463

Claim:
A band pass filter comprising: partial filters, each of the partial filters having a pass band; wherein pass bands of different ones of the partial filters have center frequencies that are different; wherein a partial filter with a lowest center frequency has a pass band with a first low-frequency edge and a first high-frequency edge, the first low-frequency edge being steeper than the first high-frequency edge; wherein a partial filter with a highest center frequency has a pass band with a second low-frequency edge and a second high-frequency edge, the second high-frequency edge being steeper than the second low-frequency edge; and wherein the band pass filter comprises a surface acoustic wave filter; and a transducer having an acoustic track that is divided into partial tracks in a transverse direction; wherein each partial track forms one of the partial filters; wherein partial tracks are divided, in a longitudinal direction, into a number N of consecutive acoustic cells; wherein a partial track has acoustic cells of different cell types; and wherein acoustic cell type is defined by a sequence of electrode fingers of an acoustic cell.