Title:
BANDPASS FILTER
Document Type and Number:
WIPO Patent Application WO/2019/146441
Kind Code:
A1
Abstract:
Provided is a bandpass filter which is suppressed in decrease of the absolute value of S21 in frequency regions that are on the higher frequency side and the lower frequency side of the passband. A bandpass filter (100) according to the present invention is provided with: a first filter circuit (FC1) which comprises a first resonant circuit (RC1) that has a first inductor (L11) and a second resonant circuit (RC2) that has a second inductor (L12); a second filter circuit (FC2) which comprises a third resonant circuit (RC3) that has a third inductor (L21) and a fourth resonant circuit (RC4) that has a fourth inductor (L22); and a fifth resonant circuit (RC5) that has a fifth inductor (L31). The fifth inductor (L31) is electromagnetically coupled to the first inductor (L11), the second inductor (L12), the third inductor (L21) and the fourth inductor (L22), respectively.
Inventors:
TANIGUCHI TETSUO (JP)
Application Number:
PCT/JP2019/000849
Publication Date:
August 01, 2019
Filing Date:
January 15, 2019
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/09; H03H7/01
Domestic Patent References:
| WO2012077498A1 | 2012-06-14 |
Foreign References:
| JP2005045447A | 2005-02-17 | |||
| JPH0585120U | 1993-11-16 | |||
| JP2012120149A | 2012-06-21 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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