Title:
SURFACE ACOUSTIC WAVE FILTER
Document Type and Number:
Japanese Patent JP2015119452
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a ladder-type surface acoustic wave filter which widens the normal bandwidth while reducing the loss, and enhances the degree of suppression outside of pass-band.SOLUTION: A surface acoustic wave filter includes a multilayer substrate consisting of a multilayer structure of a piezoelectric film/a low sound speed film/a high sound speed film/a support substrate, and an interdigital electrode formed thereon, where first one terminal pair surface acoustic wave resonators 21 having a predetermined resonance frequency are arranged in parallel arm 22, second one terminal pair surface acoustic wave resonators 23 having a resonance frequency substantially matching the antiresonant frequency of the first resonator are arranged in a series arm 24. Furthermore, an inductance 25 is added in series with the first surface acoustic wave resonator 21.
Inventors:
KOBAYASHI MASAYA
MASUDA MICHIMASA
IWAMOTO HIDEKI
MASUDA MICHIMASA
IWAMOTO HIDEKI
Application Number:
JP2013263583A
Publication Date:
June 25, 2015
Filing Date:
December 20, 2013
Export Citation:
Assignee:
MURATA MANUFACTURING CO
International Classes:
H03H9/64; H03H9/145; H03H9/25
Domestic Patent References:
| JPH05183380A | 1993-07-23 | |||
| JP2015119449A | 2015-06-25 |
Foreign References:
| WO2012086639A1 | 2012-06-28 |
Attorney, Agent or Firm:
Patent business corporation Miya saki, table of contents patent office
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