Abstract: An elastic wave device includes elastic wave filters connected in parallel between an input and an output, and has reduced size and insertion loss, and improved electric power handling capability. An elastic wave filter chip is mounted on a die-attach surface of a wiring board and includes an input signal terminal and output signal terminals. At least one of the input and output signal terminals includes a plurality of signal terminals. A common connection wiring line to commonly connect the plurality of signal terminals of the elastic wave filter chip is provided in the wiring board.

Abstract: An elastic wave filter includes at least a piezoelectric substrate and a longitudinally coupled resonator-type elastic wave filter unit provided on the piezoelectric substrate. The longitudinally coupled resonator-type elastic wave filter unit includes first to fifth IDTs and first and second reflectors arranged on either side of the first to fifth IDTs. The third IDT includes first and second divided comb-shaped electrodes. The second and fourth IDTs are connected to an unbalanced signal terminal, the first IDT and the first divided comb-shaped electrode of the third IDT are connected to a first balanced signal terminal, and the fifth IDT and the second divided comb-shaped electrode of the third IDT are connected to a second balanced signal terminal. The first and fifth IDTs each have a constant electrode finger pitch, and the electrode finger pitch of the first IDT is less than that of the fifth IDT.

Abstract: An elastic wave filter includes at least a piezoelectric substrate and a longitudinally coupled resonator-type elastic wave filter unit provided on the piezoelectric substrate. The longitudinally coupled resonator-type elastic wave filter unit includes first to fifth IDTs and first and second reflectors arranged on either side of the first to fifth IDTs. The third IDT includes first and second divided comb-shaped electrodes. The second and fourth IDTs are connected to an unbalanced signal terminal, the first IDT and the first divided comb-shaped electrode of the third IDT are connected to a first balanced signal terminal, and the fifth IDT and the second divided comb-shaped electrode of the third IDT are connected to a second balanced signal terminal. The first and fifth IDTs each have a constant electrode finger pitch, and the electrode finger pitch of the first IDT is less than that of the fifth IDT.

Abstract: In an acoustic wave filter device, first and second acoustic wave filter elements are connected in parallel to an unbalance terminal. Of first to third IDTs, the second and third IDTs are connected to a first balance terminal. Of fourth to sixth IDTs, the fifth and sixth IDTs are connected to a second balance terminal. The first ground terminal is arranged at a position close to the side of the unbalance terminal and shifted to the side of the first acoustic wave filter element. The third ground terminal is arranged in a point-symmetric relationship relative to the first ground terminal with respect to a middle point between the first and second acoustic wave filter elements.

Abstract: An acoustic wave filter device which attains improved balancing between transmission characteristics of first and second balanced terminals includes first and second 3-IDT longitudinally coupled resonator type acoustic wave filter elements that are connected to an unbalanced terminal in parallel, and one terminal of a first IDT and one terminal of a fourth IDT are connected to each other and further connected to the unbalanced terminal, second and third IDTs are connected to each other and further connected to a first balanced terminal, fifth and sixth IDTs are connected to each other and further connected to a second balanced terminal, and a first ground line which electrically connects the second IDT which is nearer to a first ground terminal than the third IDT to the second ground terminal is longer than a second ground line which electrically connects the fifth IDT which is nearer to the first ground terminal than the sixth IDT to the first ground terminal.

Abstract: In an acoustic wave filter device, first and second acoustic wave filter elements are connected in parallel to an unbalance terminal. Of first to third IDTs, the second and third IDTs are connected to a first balance terminal. Of fourth to sixth IDTs, the fifth and sixth IDTs are connected to a second balance terminal. The first ground terminal is arranged at a position close to the side of the unbalance terminal and shifted to the side of the first acoustic wave filter element. The third ground terminal is arranged in a point-symmetric relationship relative to the first ground terminal with respect to a middle point between the first and second acoustic wave filter elements.

Abstract: An acoustic wave filter device which attains improved balancing between transmission characteristics of first and second balanced terminals includes first and second 3-IDT longitudinally coupled resonator type acoustic wave filter elements that are connected to an unbalanced terminal in parallel, and one terminal of a first IDT and one terminal of a fourth IDT are connected to each other and further connected to the unbalanced terminal, second and third IDTs are connected to each other and further connected to a first balanced terminal, fifth and sixth IDTs are connected to each other and further connected to a second balanced terminal, and a first ground line which electrically connects the second IDT which is nearer to a first ground terminal than the third IDT to the second ground terminal is longer than a second ground line which electrically connects the fifth IDT which is nearer to the first ground terminal than the sixth IDT to the first ground terminal.