US 12,348,210 B2
Multilayer filter
Masahiro Tatematsu, Tokyo (JP); Yuta Ashida, Tokyo (JP); Shuhei Sawaguchi, Tokyo (JP); Keigo Shibuya, Tokyo (JP); Tomonori Terui, Tokyo (JP); and Tetsuzo Goto, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Aug. 28, 2023, as Appl. No. 18/456,835.
Claims priority of application No. 2022-135775 (JP), filed on Aug. 29, 2022.
Prior Publication US 2024/0072754 A1, Feb. 29, 2024
Int. Cl. H03H 7/01 (2006.01); H03H 1/00 (2006.01)
CPC H03H 7/1775 (2013.01) [H03H 7/0115 (2013.01); H03H 2001/0085 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A multilayer filter, comprising:
a multilayer body in which a plurality of dielectric layers are stacked; and
a conductor unit provided inside the multilayer body,
wherein the conductor unit includes an input/output portion and first and second resonant circuits arranged in a direction crossing a stacking direction of the plurality of dielectric layers and connected to the input/output portion,
the input/output portion includes an input/output port group including an unbalanced port and a pair of balanced ports or an input/output port group including two pairs of balanced ports,
the second resonant circuit includes an inductor conductor having first and second ends, a first capacitor conductor connected to the first end, and a second capacitor conductor connected to the second end,
the plurality of dielectric layers include a first dielectric layer and a second dielectric layer having a dielectric constant lower than that of the first dielectric layer,
the first and second capacitor conductors are provided in the first dielectric layer, and
at least a part of the inductor conductor is provided in the second dielectric layer.