US 12,438,513 B2
Filter
Takuya Satou, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Aug. 28, 2023, as Appl. No. 18/238,768.
Application 18/238,768 is a continuation of application No. PCT/JP2022/006799, filed on Feb. 19, 2022.
Claims priority of application No. 2021-040872 (JP), filed on Mar. 12, 2021; and application No. 2021-073706 (JP), filed on Apr. 24, 2021.
Prior Publication US 2023/0402985 A1, Dec. 14, 2023
Int. Cl. H03H 7/09 (2006.01); H03H 7/01 (2006.01)
CPC H03H 7/09 (2013.01) [H03H 7/0115 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A filter, comprising:
a first input/output terminal;
a second input/output terminal;
a third input/output terminal;
a fourth input/output terminal;
a first stage resonant circuit connected between the first input/output terminal and the second input/output terminal;
at least one intermediate stage resonant circuit; and
a final stage resonant circuit connected between the third input/output terminal and the fourth input/output terminal; wherein
the first stage resonant circuit and the final stage resonant circuit each include an inductor;
the at least one intermediate stage resonant circuit includes an inductor and a capacitor connected in parallel to each other, and one end of the inductor and one end of the capacitor connected in parallel to the inductor are connected to a reference potential; and
at least two of the first stage resonant circuit, the at least one intermediate stage resonant circuit, and the final stage resonant circuit are coupled to each other.