US 12,374,769 B2
Dielectric ceramic filter
Joung Hoe Kim, Hwaseong-si (KR); and Sang Yoong Kim, Hwaseong-si (KR)
Assigned to KMW INC., Hwaseong-si (KR)
Filed by KMW INC., Hwaseong-si (KR)
Filed on May 13, 2022, as Appl. No. 17/743,583.
Application 17/743,583 is a continuation of application No. PCT/KR2020/015604, filed on Nov. 9, 2020.
Claims priority of application No. 10-2019-0144935 (KR), filed on Nov. 13, 2019; and application No. 10-2020-0147854 (KR), filed on Nov. 6, 2020.
Prior Publication US 2022/0271411 A1, Aug. 25, 2022
Int. Cl. H01P 3/16 (2006.01); H01P 1/20 (2006.01); H01P 1/205 (2006.01); H01P 11/00 (2006.01)
CPC H01P 11/006 (2013.01) [H01P 1/2002 (2013.01); H01P 1/2056 (2013.01); H01P 3/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dielectric ceramic filter comprising:
a dielectric block filled with a ceramic material and having an outer surface surrounded by a metal component;
a plurality of resonance parts provided in the dielectric block, each having a space with a circular horizontal cross-section, and separated from the dielectric block by a metal film, wherein each of the resonance parts includes a cylindrical wall having the metal film formed on an inner surface thereof; and
a tuning cover coupled to the dielectric block, configured to cover one side of each of the resonance parts, and positioned at a portion corresponding to the resonance parts, wherein the tuning cover includes a tuning correction hole corresponding to each of the resonance parts, and a deformed portion formed by a dot peen structure, the deformed portion being deformed at a position in corresponding to the metal film and spaced apart from the tuning correction hole by a predetermined distance in a radial direction.