Patent US985701A successfully refreshed from Google Patents.
EP0448085A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dielectric filter
Assignee: Sanyo Electric Co Ltd
•
Filing: 1991-03-20
•
Granted: —
•
Expires: 2011-03-20
Abstract
Abstract A dielectric filter includes: a plurality of coaxial resonators (1,1') and external connection means; each of the coaxial resonators includes a dielectric block having an outer peripheral surface and an inner peripheral surface parallel to a common axis and having two end faces, a conductive layer formed on the outer and inner peripheral surfaces and on one of the end faces, and a depression part for accepting the external connection means and formed by removing a portion of the conductive layer on at least the outer peripheral surface in the vicinity of the other end face; and the external connection means includes a dielectric substrate (3), and an external connection electrode (3a',3a") formed on the dielectric substrate and capacitance-coupled with the conductive layer (1d,1d') on the inner peripheral surface.
Inventors
- 👤 Atsushi Itoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:47
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2053
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
A dielectric filter comprising: a plurality of coaxial resonators; and external connection means, each said coaxial resonator including a dielectric block having an outer peripheral surface and an inner peripheral surface both parallel to a common axis and having first and second end faces crossing over said common axis, first and second conductive layers formed respectively on said outer peripheral surface and said inner peripheral surface, a third conductive layer formed on said second end face and connecting the first and second conductive layers, and a depression part for accepting said external connection means and formed by removing a portion of the first conductive layer on at least said outer peripheral surface in the vicinity of said first end face, said external connection means including a dielectric substrate, and an electrode for an external connection formed on said dielectric substrate.
Claim 2
Dependent Claim
28 words
The dielectric filter of claim 1, wherein said external connection means includes a plurality of coupling electrodes formed to be capacitance-coupled with each other on said dielectric substrate.
Claim 3
Dependent Claim
40 words
The dielectric filter of claim 1, wherein each said coaxial resonator has a window formed by removing a portion of the first conductor layer on said outer peripheral surface in order to enable the mutual coupling between said coaxial resonators.
Claim 4
Dependent Claim
55 words
The dielectric filter of claim 3, wherein said window has a rectangular form and is provided on the vicinity of a center of said outer peripheral surface in a direction along said common axis so that a longer side of said rectangle may be in parallel with a direction substantially orthogonal to said common axis.
Claim 5
Dependent Claim
159 words
A dielectric filter comprising: a resonator; and external connection means, said resonator including a dielectric block having an outer peripheral surface parallel to an axis and a plurality of inner peripheral surfaces parallel to said axis and having first and second end faces crossing over said axis, a first conductive layer formed on said outer peripheral surface, a plurality of second conductive layers formed on said plurality of inner peripheral surfaces, a third conductive layer formed on said second end face and connecting the first and second conductive layers, and a depression part for accepting said external connection means and formed by removing a portion of the first conductive layer on at least said outer peripheral surface in the vicinity of said first end face, said external connection means including a dielectric substrate, and an electrode for an external connection formed on said dielectric substrate and capacitance-coupled with one of the second conductor layers on said inner peripheral surfaces.
Claim 6
Dependent Claim
64 words
The dielectric filter of claim 5, wherein said dielectric block includes a plurality of said depression parts in the vicinity of said first end face, and said external connection means includes a plurality of dielectric substrates and an electrode for an external connection formed on each of said dielectric substrates and capacitance-coupled with one of the second conductive layers on said inner peripheral surfaces.
Claim 7
Dependent Claim
175 words
A dielectric filter comprising: a resonator; external connection means; and a dielectric layer for filling a space between said resonator and said external connection means, said resonator including a dielectric block having an outer peripheral surface parallel to an axis and one or more inner peripheral surfaces parallel to said axis and having first and second end faces crossing over said axis, a first conductive layer formed on said outer peripheral surface, a second conductive layer formed on said one or more inner peripheral surfaces, a third conductive layer formed on said second end face and connecting the first and second conductive layers, and a depression part for accepting said dielectric layer and said external connection means and formed by removing a portion of the first conductive layer on at least said outer peripheral surface in the vicinity of said first end face, said external connection means including a dielectric substrate, and an electrode for an external connection formed on said dielectric substrate and capacitance-coupled with the second conductive layer on said inner peripheral surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.