公开(公告)号：US20250125781A1

公开(公告)日：2025-04-17

申请号：US18910435

申请日：2024-10-09

Applicant: TDK CORPORATION

Inventor： Yuta ASHIDA ,  Shin Takane ,  Shuhei Sawaguchi ,  Tomonori Terui ,  Keigo Shibuya ,  Tetsuzo Goto ,  Masahiro Tatematsu

IPC: H03H7/01

Abstract: A filter device includes a stack including a plurality of dielectric layers stacked together, and a resonator configured using a conductor integrated into the stack. Each of the plurality of dielectric layers is formed of a dielectric material, and has a resonance frequency that changes depending on a temperature. In the dielectric material, the resonance frequency changes linearly with respect to a change in the temperature when the temperature is within a first temperature range, and the resonance frequency changes nonlinearly with respect to the change in the temperature when the temperature is within a second temperature range.

公开(公告)号：US20230282954A1

公开(公告)日：2023-09-07

申请号：US18175098

申请日：2023-02-27

Applicant: TDK CORPORATION

Inventor： Yuta ASHIDA ,  Masahiro Tatematsu ,  Shuhei Sawaguchi ,  Keigo Shibuya ,  Tetsuzo Goto

IPC: H01P1/207 ,  H01P7/06

CPC classification number: H01P1/207 ,  H01P7/06

Abstract: A filter circuit includes two ports, a first resonant circuit, and a second resonant circuit. The first resonant circuit is provided between the two ports in a circuit configuration and coupled with both of the two ports. The second resonant circuit is provided between the two ports in the circuit configuration and coupled with at least one of the two ports. Coupling of the second resonant circuit and the two ports is weaker than coupling of the first resonant circuit and the two ports.

公开(公告)号：US20240387969A1

公开(公告)日：2024-11-21

申请号：US18661108

申请日：2024-05-10

Applicant: TDK CORPORATION

Inventor： Shuhei SAWAGUCHI ,  Tetsuzo Goto ,  Yuto Ashida ,  Masahiro Tatematsu ,  Keigo Shibuya ,  Tomonori Terui

IPC: H01P1/203

Abstract: A filter includes: a first ground conductor layer and a second ground conductor layer arranged to be spaced from each other, a resonator conductor layer arranged between the first ground conductor layer and the second ground conductor layer and constituting a part of a resonator, a through hole connecting the first ground conductor layers and the resonator conductor layer and constituting a different part of the resonator, and a body. The resonator conductor layer is not directly connected to the second ground conductor layer.