Dielectric filter having respective capacitance gaps flushed with the inner surface of corresponding holes
First Claim
1. A dielectric filter with surface electromagnetic shielding, comprising:
- a dielectric body having an outer surface;
an external conductor substantially completely covering the outer surface of the dielectric body so as to provide said surface electromagnetic shielding of said dielectric filter; and
a plurality of holes extending through the dielectric body, each hole having a respective inner surface with a substantially constant cross-sectional shape along an axial direction of the corresponding hole;
at least one hole of said plurality of boles 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 rest of said inner surface of the corresponding hole; and
signal input and output electrodes provided on the outer surface of the dielectric body and electrically isolated from said external conductor for providing capacitive coupling with respective internal conductors of two of the plurality of holes, and closely surrounded by said external conductor for providing capacitive coupling with said external conductor.
0 Assignments
0 Petitions
Accused Products
Abstract
A dielectric block having an external conductor on the outer surface and a plurality of holes with internal conductors formed therein; no internal conductors are provided near one end of each of the plurality of holes. Portions of the dielectric block and the external conductor are removed so as to obtain a dielectric resonator having desired resonator characteristics. In another embodiment, portions of the dielectric block are removed so as to bring the external conductor closer to the internal conductors thereby obtaining a dielectric resonator resonant with a desired frequency. The dielectric resonators limit leakage of electromagnetic field and do not require additional parts such as terminals and case.
20 Citations
13 Claims
-
1. A dielectric filter with surface electromagnetic shielding, comprising:
-
a dielectric body having an outer surface; an external conductor substantially completely covering the outer surface of the dielectric body so as to provide said surface electromagnetic shielding of said dielectric filter; and a plurality of holes extending through the dielectric body, each hole having a respective inner surface with a substantially constant cross-sectional shape along an axial direction of the corresponding hole; at least one hole of said plurality of boles 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 rest of said inner surface of the corresponding hole; and signal input and output electrodes provided on the outer surface of the dielectric body and electrically isolated from said external conductor for providing capacitive coupling with respective internal conductors of two of the plurality of holes, and closely surrounded by said external conductor for providing capacitive coupling with said external conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A dielectric filter with integral electromagnetic shielding, comprising:
-
a dielectric body having an outer surface; an external conductor substantially completely covering the outer surface of the dielectric body so as to provide said integral electromagnetic shielding of said dielectric filter; and at least one hole extending through the dielectric body, said at least one hole having a respective inner surface with a substantially constant cross-sectional shape along an axial direction of the corresponding 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 rest of said inner surface of the corresponding hole; and signal input and output electrodes provided on the outer surface of the dielectric body and electrically isolated from said external conductor for 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 providing capacitive coupling with said external conductor.
-
Specification