Importance

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Abstract

A ladder filter includes a piezoelectric substrate, an antenna terminal, a transmission terminal, and ground terminals on the piezoelectric substrate, and IDT electrodes. Each of the IDT electrodes is disposed on the piezoelectric substrate and includes a plurality of electrode fingers and a pair of busbars to which first ends of the plurality of electrode fingers are connected commonly. The IDT electrodes define elastic wave resonators. The ladder filter further includes an interlayer insulating film disposed on at least one of the busbars and a thermally conductive member made of a material with thermal conductivity higher than that of the interlayer insulating film and disposed on the interlayer insulating film. The thermally conductive member is in contact with at least one of the antenna terminal, the transmission terminal, and the ground terminals.

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First Claim