US 12,278,609 B2
Filter device and radio-frequency front-end circuit including the same
Keisuke Ogawa, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Feb. 9, 2023, as Appl. No. 18/107,552.
Application 18/107,552 is a continuation of application No. PCT/JP2021/035278, filed on Sep. 27, 2021.
Claims priority of application No. 2020-167576 (JP), filed on Oct. 2, 2020; and application No. 2021-050290 (JP), filed on Mar. 24, 2021.
Prior Publication US 2023/0188111 A1, Jun. 15, 2023
Int. Cl. H03H 7/01 (2006.01); H01F 27/28 (2006.01); H01F 27/29 (2006.01); H01G 4/012 (2006.01); H01G 4/30 (2006.01); H01P 1/203 (2006.01); H03H 1/00 (2006.01)
CPC H03H 7/0115 (2013.01) [H01F 27/2804 (2013.01); H01F 27/29 (2013.01); H01G 4/012 (2013.01); H01G 4/30 (2013.01); H01P 1/20345 (2013.01); H03H 7/0161 (2013.01); H01F 2027/2809 (2013.01); H03H 2001/0085 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A filter device comprising:
a body;
an input terminal;
an output terminal;
a ground terminal; and
a plurality of resonators provided in the body to be coupled to each other by electromagnetic field coupling; wherein
the plurality of resonators include:
a first resonator coupled to the input terminal;
a second resonator coupled to the output terminal and adjacent to the first resonator in a first direction;
a third resonator adjacent to the first resonator in a second direction perpendicular to the first direction; and
a fourth resonator adjacent to the third resonator in the first direction;
the third resonator and the fourth resonator partially share a path connected to the ground terminal;
the plurality of resonators each include:
a plate electrode;
a first via including one end connected to the plate electrode and another end connected to the ground terminal via a capacitor; and
a second via including one end connected to the plate electrode and another end connected to the ground terminal; and
the second via of the third resonator and the second via of the fourth resonator are combined in a shared manner.