Patent ID: 6353374
Filing Date: 2002-03-05
Classification: H01P,Y10T

Abstract:
A dielectric filter, comprising:a dielectric block having an outer surface including first and second end surfaces and a side surface extending between the first and second end surfaces; an external conductor disposed on the outer surface of the dielectric block, said external conductor substantially completely covering said outer surface; a hole extending through the dielectric body between said first and second end surfaces, said hole having a respective inner surface; said hole having a respective pair of internal conductors disposed on the corresponding inner surface thereof and conductively connected to said external conductor respectively at said first and second end surfaces, a respective non-conductive portion at said corresponding inner surface being spaced from both of said end surfaces and thereby separating said corresponding pair of internal conductors and defining a respective capacitance between said corresponding pair of internal conductors; a predetermined portion of one of said first and second end surfaces of the dielectric block having a shape such that a first portion of the external conductor at said predetermined portion is closer to at least one of said pair of internal conductors of said hole, as compared with a second portion of the external conductor at a portion of the dielectric block other than the predetermined portion; wherein said predetermined portion of said one of said first and second end surfaces is located in a plurality of recesses located in the dielectric block in said one of said first and second end surfaces, the external conductor extending into and over a bottom surface of said plurality of recesses.