Title:
ACOUSTIC WAVE FILTER AND MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2021/010379
Kind Code:
A1
Abstract:
An acoustic wave filter (40) is provided with a longitudinally coupled resonator (1) having a plurality of IDT electrodes and reflectors. When: [i] a distance between an electrode finger (Fe(k)) and an electrode finger (Fe(k+1)) is defined as a k-th electrode finger pitch (P(k)); [ii] in three neighboring electrode fingers that are an electrode finger (Fe(k-1)), the electrode finger (Fe(k)), and the electrode finger (Fe(k+1)), a value obtained by dividing, by an overall average electrode finger pitch (PT), a difference between the electrode finger pitch (P(k)) and a section average electrode finger pitch (PM(k)) which is an average of the electrode finger pitches (P(k-1)) and (P(k+1)) is defined as a pitch deviation rate (D(k)); and [iii] a distribution obtained by calculating pitch deviation rates (D(k)) regarding all electrode fingers included in the IDT electrodes or the reflectors is defined as a histogram of the pitch deviation rates (D(k)), then the plurality of IDT electrodes or reflectors have not less than 1.4% of a standard deviation (SD) of the pitch deviation rates (D) in the histogram.
More Like This:
| JP5046961 | High frequency elastic wave device |
| WO/2021/149501 | ELASTIC WAVE DEVICE |
Inventors:
NOGUCHI AKIRA (JP)
Application Number:
PCT/JP2020/027273
Publication Date:
January 21, 2021
Filing Date:
July 13, 2020
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145
Domestic Patent References:
| WO2018123657A1 | 2018-07-05 | |||
| WO2016208236A1 | 2016-12-29 |
Foreign References:
| JP2008252678A | 2008-10-16 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
Download PDF:
Previous Patent: WATER ABSORPTION DEVICE
Next Patent: SEMICONDUCTOR CHIP AND METHODS FOR MANUFACTURING SEMICONDUCTOR CHIP
Next Patent: SEMICONDUCTOR CHIP AND METHODS FOR MANUFACTURING SEMICONDUCTOR CHIP