Patent ID: 8405472

Claim:
An elastic wave filter device comprising: a substrate having a laminated structure including an upper surface and a lower surface; an elastic wave filter chip mounted on the upper surface of the laminated substrate by flip-chip bonding; and first and second inductance elements provided in the laminated substrate; wherein the first inductance element includes a first coil pattern provided in a plane at a certain height level in the laminated substrate, the second inductance element includes a second coil pattern provided in the plane at the certain height level at which the first coil pattern is provided, and the second coil pattern is arranged in a region in which the first coil pattern is arranged in the plane; in the region in which the first coil pattern is arranged, the first coil pattern has a planar or substantially planar shape including a substantially horseshoe shaped recess that is open in a certain direction and the second coil pattern is arranged in the recess; a third coil pattern is provided in the plane; and the third coil pattern is arranged on a side of the first coil pattern opposite to the direction in which the recess in the first coil pattern is open.