×

Dielectric resonator filter having a portion of the outer surface closer to the resonators

  • US 6,014,067 A
  • Filed: 04/14/1997
  • Issued: 01/11/2000
  • Est. Priority Date: 01/22/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A dielectric filter with integral electromagnetic shielding, comprising:

  • a dielectric block having an outer surface including first and second end surfaces and a first-mentioned 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 so as to provide said integral electromagnetic shielding of said dielectric filter;

    at least one hole extending through the dielectric body between said first and second end surfaces, said at least one hole having a respective inner surface with a substantially constant cross-sectional shape along an axial direction of said at least one hole;

    said at least one hole having a respective pair of internal conductors provided in the corresponding hole and conductively connected to said external conductor at respective ends of said corresponding hole, a respective non-conductive portion at said inner surface of the corresponding hole being spaced from both ends of said respective hole and thereby separating said corresponding pair of internal conductors and thereby defining a respective capacitance between said corresponding pair of internal conductors, a surface of said respective non-conductive portion being substantially flush with the remainder of said inner surface of the corresponding hole;

    signal input and output electrodes provided on the outer surface of the dielectric body and electrically isolated from said external conductor for respectively providing capacitive coupling with at least one of said internal conductors of said at least one hole, and closely surrounded by said external conductor for respectively providing capacitive coupling with said external conductor; and

    a predetermined portion of said first-mentioned side surface 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 internal conductors of said at least one hole, as compared with a second portion of the external conductor at a portion of the dielectric block other than the predetermined portion.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×