US4450421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric filter
Assignee: Fujitsu Ltd
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Filing: 1982-06-30
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Granted: 1984-05-22
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Expires: 2002-06-30
Abstract
Abstract A comb-line type dielectric filter in which a plurality of resonator holes are made in a dielectric block at predetermined intervals and coupling adjustment holes are made between the resonator holes, the interior surfaces of the resonator holes and the surface of the dielectric block being entirely or partly covered with a conductor film. The coupling adjustment holes are disposed apart from the line joining the centers of the resonator holes, and a coupling adjusting member made of metal or dielectric material is inserted into each coupling adjustment hole.
Inventors
- 👤 Takeshi Meguro
- 👤 Yukio Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:47
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2056
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A dielectric filter comprising: a dielectric block; a plurality of resonator holes made in the dielectric block at predetermined intervals for forming resonators; and a hole made in the dielectric block between each adjacent pair of the resonator holes, for adjusting the coupling between the resonators, the interior surfaces of the resonator holes and the surface of the dielectric block, except the interior surface of each coupling adjustment hole, being at least partly covered with a conductor layer; wherein each said coupling adjustment hole is disposed apart from the line joining the centers of the resonator holes.
Claim 2
Dependent Claim
97 words
A dielectric filter comprising: a dielectric block; a plurality of resonator holes made in the dielectric block at predetermined intervals for forming resonators; and a hole made in the dielectric block between each adjacent pair of the resonator holes, for adjusting the coupling between the resonators, the interior surfaces of the resonator holes and the surface of the dielectric block, except the interior surface of each coupling adjustment hole, being at least partly covered with a conductor layer; wherein each said coupling adjustment hole is disposed apart from the line joining the centers of the resonator holes.
Claim 3
Dependent Claim
18 words
A dielectric filter according to claim 1 wherein each said coupling adjustment hole extends through the dielectric block.
Claim 4
Dependent Claim
22 words
A dielectric filter according to claim 1 wherein each coupling adjustment hole is made in the dielectric block to a selected depth.
Claim 5
Dependent Claim
33 words
A dielectric filter according to claim 1 or 2 wherein a coupling fine control member is inserted into each said coupling adjustment hole in a manner to be adjustable in its position therein.
Claim 6
Dependent Claim
18 words
A dielectric filter according to claim 4 wherein each said coupling fine control member is made of metal.
Claim 7
Dependent Claim
20 words
A dielectric filter according to claim 4 wherein each said coupling fine control member is made of a dielectric material.
Claim 8
Dependent Claim
25 words
The filter of claim 1, each said resonator hole having a cylindrical portion of its interior surface at one end of the hole left uncoated.
Claim 9
Dependent Claim
24 words
The filter of claim 1, comprising a fine control screw at one of each said resonator hole for adjusting the frequency of the resonators.
Claim 10
Dependent Claim
35 words
The filter of claim 1, said resonator holes being formed from an opposite surface of said dielectric block than each said hole for adjusting the coupling, all of said holes only partially penetrating said block.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |