Title:
FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/100611
Kind Code:
A1
Abstract:
Provided is a filter device capable of suppressing tertiary distortion due to interfering waves. A filter device 1 is provided with a first filter 2A and a second filter 2B commonly connected to a common terminal 3, the first filter 2A having a first pass-band and the second filter 2B having a second pass-band located on the higher frequency side of the first pass-band. The first filter 2A comprises a parallel connection portion 5 in which a plurality of parallel arm resonators are connected in parallel to each other without passing through a series arm resonator. The plurality of parallel arm resonators in the parallel connection portion 5 include first and second parallel arm resonators having mutually different antiresonant frequencies. In the combined impedance frequency characteristics of the plurality of parallel arm resonators in the parallel connection portion, when the first pass-band is f1min to f1max and the second pass-band is f2min to f2max, at least one of the antiresonant frequencies other than a highest antiresonant frequency is 2f1min-f2min or higher and 2f1max-f2max or lower.
Inventors:
MICHIGAMI AKIRA (JP)
Application Number:
PCT/JP2020/042291
Publication Date:
May 27, 2021
Filing Date:
November 12, 2020
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/46; H03H9/64; H03H9/72
Domestic Patent References:
| WO2014196245A1 | 2014-12-11 | |||
| WO2019131501A1 | 2019-07-04 | |||
| WO2016088680A1 | 2016-06-09 | |||
| WO2016117676A1 | 2016-07-28 |
Foreign References:
| JP2014013959A | 2014-01-23 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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