ELASTIC WAVE DEVICE AND MODULE INCLUDING THE ELASTIC WAVE DEVICE

To provide an elastic wave device with improved power resistance.SOLUTION: An elastic wave device includes a piezoelectric substrate and a plurality of resonators constituting a bandpass filter formed on the piezoelectric substrate. At least one of the plurality of resonators is a multistep split resonator including a first split resonator to which an input electric signal is input first, a second split resonator to which the input electric signal is input the last, and a third split resonator disposed between the first split resonator and the second split resonator, which are split in series. The resonance frequency of the multistep split resonator is on the high frequency side among bandpass filter frequency bands. The resonance frequency of the first split resonator and the resonance frequency of the second split resonator are lower than the resonance frequency of the third split resonator.SELECTED DRAWING: Figure 3 【課題】耐電力が向上した弾性波デバイスを提供する。【解決手段】圧電基板と、前記圧電基板上に形成されたバンドパスフィルタを構成する複数の共振器とを備え、前記複数の共振器の少なくとも１つは、直列に分割された、入力される電気信号が最初に入力される第１分割共振器と、入力される電気信号が最後に入力される第２分割共振器と、前記第１分割共振器と前記第２分割共振器の間に配置された第３分割共振器とを含む多段分割共振器であり、前記多段分割共振器の共振周波数は、前記バンドパスフィルタ周波数帯域のうち、高周波側であり、前記第１分割共振器の共振周波数および前記第２分割共振器の共振周波数は、前記第３分割共振器の共振周波数よりも低い弾性波デバイス。【選択図】図３