Title:
複合型フィルタ装置、高周波フロントエンド回路および通信装置
Document Type and Number:
Japanese Patent JP6822444
Kind Code:
B2
Abstract:
To provide a composite filter device by which the loss of a pass band of each filter can be reduced easily.SOLUTION: A composite filter device 120 comprises: a common terminal 12; a transmission-side terminal 13; a receiving-side terminal 15; a transmission filter 100; and a receiving filter 200 having a pass band which is higher than a pass band of the transmission filter 100. The transmission filter 100 is connected between the common terminal 12 and the transmission-side terminal 13, and the receiving filter 200 is connected between the common terminal 12 and the receiving-side terminal 15. On a path connecting the common terminal 12 to the receiving-side terminal 15, an inductor 14 is provided between the common terminal 12 and the receiving filter 200. The resonant frequency of a parallel arm resonator 206 in the receiving filter 200, which is a resonator closest to the common terminal 12 is lower than a high end frequency of the pass band of the transmission filter 100 and lower than any resonant frequency of other parallel arm resonators of the receiving filter 200.SELECTED DRAWING: Figure 1
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Inventors:
Toshiaki Takada
Application Number:
JP2018117003A
Publication Date:
January 27, 2021
Filing Date:
June 20, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H03H9/72; H03H7/46; H03H9/17; H03H9/54; H03H9/64; H03H9/70; H04B1/00; H04B1/52
Domestic Patent References:
| JP2008294780A | ||||
| JP2008160562A | ||||
| JP2009207075A |
Foreign References:
| WO2016208670A1 |
Attorney, Agent or Firm:
Fukami patent office