Patent ID: 7327206

Claim:
A surface acoustic wave branching filter comprising: a first surface acoustic wave filter having a ladder-type circuit structure including a plurality of parallel-arm resonators and a plurality of series-arm resonators, the first surface acoustic wave filter having a relatively low passband; a second surface acoustic wave filter having a relatively high passband that is higher than said relatively low passband; a first common terminal to which one end of each of the first and second surface acoustic wave filters is connected, the first common terminal being connected to an antenna; and a phase adjustment element located between the second surface acoustic wave filter and the first common terminal; wherein one of the plurality of series-arm resonators and parallel-arm resonators that is closest to the first common terminal is a parallel-arm resonator and the capacitance of the parallel-arm resonator that is closest to the first common terminal is less than about ½ of the capacitance of another one of the plurality of parallel-arm resonators; and the amount of phase delay of the phase adjustment element is less than about 90 degrees from a central frequency of the first surface acoustic wave filter and, when seen from the side of the first common terminal, at least about 50% of the passband of the second surface acoustic wave filter is inductive.