Patent ID: 11909086
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A dielectric filter comprising:
a dielectric body, wherein a surface of the dielectric body is covered with a conductive layer;
a wideband filtering structure comprising a groove and at least one first resonator, wherein:
the groove is disposed on a first surface of the dielectric body and is configured to adjust a frequency position of the passband of the wideband filtering structure;
the first resonator comprises a through hole and an open loop, the through hole penetrates the bottom of the groove and a second surface of the dielectric body, and a hole wall of the through hole is covered with the conductive layer;
the open loop is located on a bottom surface of the groove and is disposed around an opening of the through hole; and
a side surface of the groove and a part, other than the open loop, of the bottom surface of the groove are covered with the conductive layer;

a narrowband filtering structure comprising at least one second resonator, which comprises a blind hole disposed on the first surface or the second surface of the dielectric body, wherein a hole wall and a bottom surface of the blind hole are covered with the conductive layer; and the first surface and the second surface of the dielectric body are disposed oppositely;
wherein both the wideband filtering structure and the narrowband filtering structure are disposed in the dielectric body; a passband of the narrowband filtering structure is located within a passband of the wideband filter structure.