Patent ID: 6911878

Claim:
A surface acoustic wave filter comprising: an antenna terminal; a transmitting filter coupled to the antenna terminal, the transmitting filter including, a first end series-arm SAW resonator having a first resistance value, a middle series-arm SAW resonator coupled to the first end series-arm SAW resonator, wherein the middle series-arm SAW resonator has a second resistance value that is higher than the first resistance value, a second end series-arm SAW resonator coupled to the middle series-arm SAW resonator, a first parallel-arm SAW resonator coupled to the first end series-arm SAW resonator and the middle series-arm SAW resonator, a second parallel-arm SAW resonator coupled to the second end series-arm SAW resonator and the middle series-arm SAW resonator, the second parallel-arm SAW resonator being coupled to the first parallel-arm SAW resonator through a common node, wherein the common node is coupled to a ground potential; and a receiving filter coupled to the ground potential.