US 12,315,978 B2
Dielectric filter and communication device
Dongchun Qiao, Yokohama (JP); Fanghai Xu, Shenzhen (CN); Jing Shi, Shanghai (CN); and Xiaoliang Du, Shanghai (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Mar. 30, 2022, as Appl. No. 17/709,085.
Application 17/709,085 is a continuation of application No. PCT/CN2019/109711, filed on Sep. 30, 2019.
Prior Publication US 2022/0223989 A1, Jul. 14, 2022
Int. Cl. H01P 1/208 (2006.01); H01P 1/20 (2006.01); H01P 1/205 (2006.01)
CPC H01P 1/2002 (2013.01) [H01P 1/2056 (2013.01); H01P 1/208 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A dielectric filter, comprising:
a dielectric body;
a first blind via and a second blind via wherein the first blind via and the second blind via are provided in the dielectric body;
a through hole located between the first blind via and the second blind via; and
an insulating portion, wherein inner walls of the first blind via, the second blind via, and the through hole each are covered with a metal layer, and an outer surface of the dielectric body is covered with a metal layer; and the insulating portion is implemented by not covering a metal layer on a surface of the dielectric body;
the through hole comprises a first through hole portion and a second through hole portion that are in communication, and an aperture of the first through hole portion is less than an aperture of the second through hole portion; and
a first opening of the first through hole portion is the first opening of the through hole, a second opening of the second through hole portion is the second opening of the through hole, the first through hole portion is in communication with the second through hole portion through a second opening of the first through hole portion and a first opening of the second through hole portion, the first opening of the through hole is provided on a first plane of the dielectric body, the second opening of the through hole is provided on a second plane of the dielectric body, and the first plane and the second plane are disposed oppositely;
the insulating portion is provided on the second plane and partially surrounds the second through hole portion;
a projection of the first opening of the first through hole portion on the second plane is at a non-central position of the second opening of the second through hole portion;
wherein the first through hole portion is cylindrical, and the second through hole portion has an elongated cross-section that has at least one linear side.