Kyocera Corporation

Masahisa Shimozono

Tetsuya Kishino

Naofumi Kasamatsu

Tatsuya Doumoto

Hongnian Li

Masaki Nanbu

Hiroyuki Tanaka

Kenji Yamamoto

Takanori Ikuta

Kyohei Kobayashi

Tsuyoshi Nakai

Michiaki Nishimura

Junya Nishii

Yusuke Morimoto

Yuriko Nishimura

An acoustic wave elementaccording to the present disclosure includes a piezoelectric substrateand an IDT electrodeon the piezoelectric substrate. The IDT electrodeincludes a multilayer structure of a first layercomprised of Al containing 10% or less of a sub-component and a second layercomprised of a CuAlalloy. The second layerenables the acoustic wave elementto have excellent electric power resistance.

Acoustic wave element, filter element, and communication apparatus

An elastic wave element having a piezoelectric substrate equipped with a first main surface, and an excitation electrode arranged on the first main surface and having multiple electrode fingers, wherein, in a cross-sectional view in the direction orthogonal to the first main surface, the width of the electrode fingers at a first height at a distance from the first main surface is greater than the width at a second height located closest to the first main surface.

Elastic wave element, filter element, and communication device

A communication module includes a serial resonator of a transmission filter and an auxiliary resonator of a reception filter. Each of the serial resonator and the auxiliary resonator includes a piezoelectric substrate and a positive-side comb-shaped electrode and negative-side comb-shaped electrode meshing with each other. The positive-side comb-shaped electrode in the transmission filter and the negative-side comb-shaped electrode in the reception filter are connected to each other. The orientation from the positive-side comb-shaped electrode to the negative-side comb-shaped electrode relative to the crystal orientation of the piezoelectric substrate in the transmission filter and the orientation from the negative-side comb-shaped electrode to the positive-side comb-shaped electrode relative to the crystal orientation of the piezoelectric substrate in the reception filter are inverse to each other.

Acoustic wave module

A branchingfilter has an antenna terminalwhich receives signal waves and disturbance waves, a transmission filterwhich is connected to the antenna terminal, a reception filterwhich is connected to the antenna terminaland receives a portion of the signal waves and has, as a passband, a frequency range higher than a passband of the transmission filter, and a disturbance wave resonator which is connected to the antenna terminaland to the ground and positioned closer to the antenna terminalside than the transmission filterand the reception filter. The disturbance wave resonatoris connected to antenna terminalat a position closer to the antenna terminalside than the transmission filterand the reception filter. A resonance frequency of the disturbance wave resonatoris within a frequency range smaller than the passband of the transmission filter and includes a frequency range of the disturbance waves.

Duplexer and communication module

A SAW element has a substrate; an IDT electrode located on an upper surface of the substrate and comprises Al or an alloy containing Al; a first film located on an upper surface of the IDT electrode; and a protective layer which covers the IDT electrode provided with the first film and the portion of the substrate exposed from the IDT electrode, which has a thickness from the upper surface of the substrate larger than a total thickness of the IDT electrode and first film, and which contains a silicon oxide. The first film contains a material which has a larger acoustic impedance than the material (Al or the alloy containing Al) of the IDT electrode and the silicon oxide and which has a slower propagation velocity of an acoustic wave than the material of the IDT electrode and the silicon oxide.

Acoustic wave element and acoustic wave device using same

A surface acoustic wave SAW (SAW) device has a substrate and a filter provided at the substrate. The filter has a plurality of interdigital transducers (IDT) electrodes arranged along a propagation direction of a SAW. Each of the plurality of IDT electrodes has an electrode finger group including a plurality of electrode fingers which extent in a direction orthogonal to the propagation direction and are arranged along the propagation direction. At least one of the plurality of IDT electrodes has a wide pitch section including an adjacent first and second electrode finger among the plurality of electrode fingers. The interval between the first electrode finger and the second electrode finger is larger than the average value of the intervals between the remaining electrode fingers of the plurality of electrode fingers.

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Kyoto, Japan

Masahisa Shimozono