Patent ID: 11955681
Assignee: TDK CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A band-pass filter comprising:
a first input/output port;
a second input/output port;
a plurality of resonators that are provided between the first input/output port and the second input/output port in circuit configuration and are configured so that two resonators adjacent to each other in circuit configuration are electromagnetically coupled to each other; and
a multilayer stack configured to integrate the first input/output port, the second input/output port, and the plurality of resonators, wherein:
the multilayer stack includes a plurality of stacked dielectric layers;
each of the resonators is an open-ended resonator formed of a conductor line in the multilayer stack;
at least one of the resonators includes a resonator conductor portion including a first line part and a second line part located away from each other in a direction orthogonal to a stacking direction of the plurality of dielectric layers, and a third line part connecting the first line part and the second line part;
the first to third line parts extend to surround a space between the first line part and the second line part;
the resonators include a first resonator, a second resonator, and at least one intermediate resonator provided between the first resonator and the second resonator in circuit configuration;
the first and second resonators each include the resonator conductor portion; and
the third line part of the resonator conductor portion of the first resonator and the third line part of the resonator conductor portion of the second resonator are adjacent to each other and both extend in the same direction orthogonal to the stacking direction.