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Patent Searching and Data


Title:
LADDER-TYPE FILTER, AND COMPOSITE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/006073
Kind Code:
A1
Abstract:
Provided is a ladder-type filter capable of ensuring an adequate amount of attenuation in a frequency range different from the own band thereof, and in particular in a frequency range separated from the own band thereof. A ladder-type filter 1 is provided with series-arm resonators S11 to S13, parallel-arm resonators P11 to P15, and first and second inductors L1, L2, wherein: other ends of each of the parallel-arm resonators P13 to P15 are connected in common and are connected to a ground potential; and one end of each of the first and second inductors L1, L2 is connected to a series arm 4, and the other ends thereof are connected in common and are connected to the ground potential via a capacitor C1.

Inventors:
YAMAZAKI SUNAO (JP)
Application Number:
PCT/JP2020/025300
Publication Date:
January 14, 2021
Filing Date:
June 26, 2020
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H7/46
Domestic Patent References:
WO2018003268A12018-01-04
Foreign References:
US20170244382A12017-08-24
JP2018129680A2018-08-16
JP2000349508A2000-12-15
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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