Title:
LONGITUDINALLY COUPLED RESONATOR-TYPE ELASTIC WAVE FILTER
Document Type and Number:
WIPO Patent Application WO/2022/075070
Kind Code:
A1
Abstract:
The present invention provides a longitudinally coupled resonator-type elastic wave filter in which degradation of attenuation characteristics does not readily occur. In this longitudinally coupled resonator-type elastic wave filter 1: a first IDT electrode 13 and a second IDT electrode 14 are provided on a piezoelectric substrate 2; the direction in which electrode fingers 13c, 13d, 14c, 14d of the IDT electrodes 13, 14 extend is set as a first direction, and a direction orthogonal to the first direction is set as a second direction; a ground-side bus bar 13b of the first IDT electrode 13 and a hot-side bus bar 14a of the second IDT electrode 14 face each other in the second direction; and there is provided a projection part 13b1 that is continuous from the ground-side bus bar 13b of the first IDT electrode 13 and that extends further toward the second IDT electrode 14 in the second direction than a crossover region of the first IDT electrode 13.
More Like This:
Inventors:
NOGUCHI AKIRA (JP)
Application Number:
PCT/JP2021/034858
Publication Date:
April 14, 2022
Filing Date:
September 22, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145
Domestic Patent References:
| WO2011099532A1 | 2011-08-18 |
Foreign References:
| JP2002314367A | 2002-10-25 | |||
| JPH10290141A | 1998-10-27 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
Download PDF: