EP0508733A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Adjustable ceramic filter
Assignee: Pulse Finland Oy
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Filing: 1992-04-08
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Granted: —
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Expires: 2012-04-08
Abstract
Abstract A filter comprises several resonators in a dielectric block (1). An electrically conductive cover (10) is provided adjacent the top surface (3) of the dielectric block. The cover has a respective cut-out tab portion (71-77) located over each of the resonator holes (61-67) whereby the individual tabs may be bent to adjust the resonant frequency of the associated resonator. Alternatively, the coupling between resonators may be adjusted if the bendable tabs (111-117) are located between adjacent resonators. A cover (9) with bendable tabs, may also be disposed adjacent a side face (5) of the dielectric block, the tabs (121-127) being provided between resonators whereby the inter-resonant coupling may be adjusted. <IMAGE>
Inventors
- 👤 Pauli Nappa
- 👤 Keijo Salonen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:22
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2056
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A filter comprising a dielectric block (1) with top, bottom and side surfaces, and having at least one hole extending from the top surface to the bottom surface, the interior surface of said hole(s) and the surfaces of the block being substantially covered, with the exception of at least a part of the top surface (3) and/or one side surface (5), with conductive material (4) in order to provide a transmission line resonator at each hole, electrode means being present on the upper surface and/or on said one side surface for providing electrical signal coupling to the resonators, characterised in that an electrically conductive member (9 and/or 10) is disposed adjacent the top surface (3) and/or said one side surface of the block, said electrically conductive member having at least one cut-out portion (7 1 -7 7 ;11 1 -11 7 ;12 1 -12 7 ) which can be bent towards and away from the block to adjust the tuning of at least one of the resonators.
Claim 2
Dependent Claim
52 words
A filter as claimed in claim 1, wherein the electrically conductive member (10) is disposed adjacent the top surface (3) of the dielectric block (1), and the electrically conductive member (10) has a respective bendable cut-out portion (7 1 ,7 7 ) located over each resonator hole (6 1 -6 7 ).
Claim 3
Dependent Claim
41 words
A filter as claimed in claim 1, wherein the electrically conductive member (10) is disposed adjacent the top surface of the dielectric block (1), and the electrically conductive member (10) has a respective bendable cut-out portion located between neighbouring resonator holes.
Claim 4
Dependent Claim
58 words
A filter as claimed in any of the preceding claims, wherein the electrically conductive member (1) is disposed adjacent said one side surface (5) of the dielectric block (1), and the electrically conductive member (9) has a respective bendable cut-out portion (12 1 -12 7 ) located in line with each resonator hole (6 1 -6 7 ).
Claim 5
Dependent Claim
54 words
A filter as claimed in any of claims 1 to 3, wherein the electrically conductive member (9) is disposed adjacent said one side surface (5) of the dielectric block (1), and the electrically conductive member (9) has a respective bendable cut-out portion (12 1 -12 7 ) located opposite an area between adjacent resonators.
Claim 6
Dependent Claim
30 words
A filter as claimed in any of the preceding claims, wherein the electrically conductive member includes at least one bent side face which is fastened to the dielectric block (1).
Claim 7
Dependent Claim
30 words
A filter as claimed in any of the preceding claims, wherein the electrically conductive member is disposed in substantially parallel relationship to the top surface and/or said one side surface.
Claim 8
Dependent Claim
40 words
A filter as claimed in any of the preceding claims, wherein the electrically conductive member comprises a portion disposed adjacent the top surface of the dielectric block, and a portion disposed adjacent said one side surface of the dielectric block.
Claim 9
Dependent Claim
31 words
A filter as claimed in any of the preceding claims, wherein the electrically conductive member is in the form of a cover made by cutting and bending a unitary metal pre-form.
Claim 10
Dependent Claim
40 words
A filter as claimed in any of the preceding claims, wherein the electrically conductive member is provided with spacing members which bear against the dielectric block to define a predetermined spacing between the electrically conductive member and the dielectric block.
References Cited (Backward Citations)
No citation records indexed.
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