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：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.