Patent ID: 7999636

Claim:
A surface acoustic wave (SAW) filter arrangement, comprising: a first gate configured to operate symmetrically or asymmetrically; a second gate configured to operate symmetrically; a double-mode surface acoustic wave (DMS) filter structure, comprising: an input connected to the first gate; and an output comprising a terminal pair that includes two symmetrical terminals configured to operate symmetrically, wherein each of the two symmetrical terminals of the terminal pair is electrically connected at the output of the DMS filter structure to a respective cascaded resonator, each cascaded resonator comprising a cascaded double-gate resonator that includes pair of resonators connected in series between the terminal pair on the output of the DMS filter structure and the second gate with the pair of resonators connected in series to the output of the DMS filter structure having a resonance frequency and the DMS filter structure having a transmission range having a middle end and an upper end, and the resonance frequency is between the middle end and the upper end of the transmission range.