Title:
ACOUSTIC WAVE DEVICE, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/195446
Kind Code:
A1
Abstract:
Provided is an acoustic wave device with which it is possible to obtain satisfactory filter characteristics using Rayleigh waves in a filter having a passband on a relatively low side, while suppressing degradation of the filter characteristics of a filter having a passband on the high side. A first filter 3 and a second filter 4 each including an acoustic wave resonator are connected to an antenna common terminal 2 via a common connecting point 6. F1< F2, where F1 and F2 are first and second passbands of the first and second filters 3, 4 respectively. The first filter 3 includes at least one acoustic wave resonator. The acoustic wave resonator employs Rayleigh waves propagating through LiNbO3, includes an IDT electrode which contains a Pt film and is disposed on a piezoelectric layer comprising LiNbO3, and is provided with a silicon oxide film covering the IDT electrode. The thickness of the silicon oxide film is at most equal to 33% of the wavelength λ of the IDT electrode.
Inventors:
SAJI MARI (JP)
YASUDA JUNPEI (JP)
YASUDA JUNPEI (JP)
Application Number:
PCT/JP2017/008839
Publication Date:
November 16, 2017
Filing Date:
March 06, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145; H03H9/72; H04B1/18
Domestic Patent References:
| WO2012098816A1 | 2012-07-26 | |||
| WO2012176455A1 | 2012-12-27 | |||
| WO2014125980A1 | 2014-08-21 | |||
| WO2015041125A1 | 2015-03-26 |
Foreign References:
| JP2014207540A | 2014-10-30 | |||
| JP2015023474A | 2015-02-02 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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