Patent ID: RE40036

Claim:
A band-pass filter having a pair of band-pass filter input common signal terminals and plural pairs of band-pass filter output signal terminals, comprising: a pair of SAW band- pass filters having respective pass bands and comprising a plurality of one-port SAW acoustic wave resonators connected in a multiple ladder structure, each having at least a first stage located at a side of the pair of band-pass filter input common signal terminals and a series-arm resonator located at the first stage, a pair of input terminals and a pair of output terminals; the pair of band-pass filter input common signal terminals being commonly connected to the respective pairs of input terminals of the pair pair of SAW band- pass filters; the plurality of pairs of band-pass filter output signal terminals being respectively connected to the respective pairs of output terminals of the pair pair of SAW band- pass filters; and an inductance element located between at least one side of only one of the SAW band- pass filters located at the first stage and the pair of band-pass filter input terminals and directly connected between the respective pair of input terminals of the at least one of the SAW filters and thereby in parallel to said at least one of the SAW filters one of the common signal terminals, and no inductance element being located between the other of the band- pass filters and one of the common signal terminals .