US5621365A
Expired / Lapsed
US
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Laminated dielectric resonator and filter
Assignee: FDK Corp
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Filing: 1994-11-11
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Granted: 1997-04-15
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Expires: 2014-11-11
Abstract
Abstract PCT No. PCT/JP94/01913 Sec. 371 Date Sep. 20, 1995 Sec. 102(e) Date Sep. 20, 1995 PCT Filed Nov. 11, 1994 PCT Pub. No. WO95/23438 PCT Pub. Date Aug. 31, 1995In a laminated dielectric resonator and filter having a folded microstrip line type resonator structure, an internal-to-external grounding conductor distance within which an open-end-side internal conductor pattern is disposed is selected to be shorter than an internal-to-external grounding conductor distance within which a short-circuit-side internal conductor pattern is disposed. In this constitution, since the front end of the resonator structure is loaded with a capacity, the resonance frequency is lowered so that it is possible to provide a resonator having a reduced longitudinal resonator size with respect to the same resonance frequency. In addition, since the resonator has no steps, manufacture and mounting are easy. Accordingly, it is possible to reduce the sizes of the laminated dielectric resonator and filter to a further extent, whereby it is possible to reduce a resonator or filter mounting area in a device.
Inventors
- 👤 Kazuhisa Yamazaki
- 👤 Nobuaki Nakamura
- 👤 Yasue Nishino
- 👤 Kazuaki Endo
- 👤 Yasuo Suzuki
- 👤 Mitsuru Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:36
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20345; H01P7/00; H01P7/08; H01P7/082
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
213 words
A laminated dielectric resonator comprising: a block-shaped dielectric material made up of a plurality of sheets laminated; an in-resonator conductor formed in said block-shaped dielectric material; said in-resonator conductor including a short-circuit-side internal conductor pattern and an open-end-side internal conductor pattern which are opposed to each other in spaced apart relationship in a pattern-thickness direction, as well as a via connection part which connects one end of said short-circuit-side internal conductor pattern to one end of said open-end-side internal conductor pattern; an external grounding conductor formed on an external surface of said dielectric material in such a manner as to be connected to the other end of said short-circuit-side internal conductor pattern but not to the other end of said open-end-side internal conductor pattern; and an internal grounding conductor provided between said internal conductor patterns formed in said dielectric material, said internal grounding conductor being connected to said external grounding conductor but not to said via connection part, thereby forming a folded microstrip line type resonator structure, wherein the distance between said internal grounding conductor and said external grounding conductor between which said open-end-side internal conductor pattern is disposed is shorter than the distance between said internal grounding conductor and said external grounding conductor between which said short-circuit-side internal conductor pattern is disposed.
Claim 2
Dependent Claim
213 words
A laminated dielectric resonator comprising: a block-shaped dielectric material made up of a plurality of sheets laminated; an in-resonator conductor formed in said block-shaped dielectric material; said in-resonator conductor including a short-circuit-side internal conductor pattern and an open-end-side internal conductor pattern which are opposed to each other in spaced apart relationship in a pattern-thickness direction, as well as a via connection part which connects one end of said short-circuit-side internal conductor pattern to one end of said open-end-side internal conductor pattern; an external grounding conductor formed on an external surface of said dielectric material in such a manner as to be connected to the other end of said short-circuit-side internal conductor pattern but not to the other end of said open-end-side internal conductor pattern; and an internal grounding conductor provided between said internal conductor patterns formed in said dielectric material, said internal grounding conductor being connected to said external grounding conductor but not to said via connection part, thereby forming a folded microstrip line type resonator structure, wherein the distance between said internal grounding conductor and said external grounding conductor between which said open-end-side internal conductor pattern is disposed is shorter than the distance between said internal grounding conductor and said external grounding conductor between which said short-circuit-side internal conductor pattern is disposed.
Claim 3
Dependent Claim
67 words
A laminated dielectric resonator according to claim 1, wherein the following relationship is satisfied: 0.4<t.sub.1 /t.sub.2 <1.0 where t 1 indicates said distance between said internal grounding conductor and said external grounding conductor between which said open-end-side internal conductor pattern is disposed and t 2 indicates said distance between said internal grounding conductor and said external grounding conductor between which said short-circuit-side internal conductor pattern is disposed.
Claim 4
Dependent Claim
75 words
A laminated dielectric resonator according to claim 1, wherein said other end of said open-end-side internal conductor pattern is exposed on a surface portion of said dielectric material, an open end face in which said external grounding conductor is absent is formed around said surface portion on which said other end of said open-end-side internal conductor pattern is exposed, and the entire surface excluding said open end face is covered with said external grounding conductor.
Claim 5
Dependent Claim
225 words
A laminated dielectric filter comprising: a block-shaped dielectric material made up of a plurality of sheets laminated; a plurality of in-resonator conductors formed in said block-shaped dielectric material in spaced apart relationship in a pattern-width direction; each of said in-resonator conductors including a short-circuit-side internal conductor pattern and an open-end-side internal conductor pattern which are opposed to each other in spaced apart relationship in a pattern-thickness direction, as well as a via connection part which connects one end of said short-circuit-side internal conductor pattern to one end of said open-end-side internal conductor pattern; an external grounding conductor formed on an external surface of said dielectric material in such a manner as to be connected to the other end of said short-circuit-side internal conductor pattern but not to the other end of said open-end-side internal conductor pattern; and an internal grounding conductor provided between said internal conductor patterns formed in said dielectric material, said internal grounding conductor being connected to said external grounding conductor but not to said via connection part, thereby forming a folded microstrip line type resonator structure, wherein the distance between said internal grounding conductor and said external grounding conductor between which said open-end-side internal conductor pattern is disposed is shorter than the distance between said internal grounding conductor and said external grounding conductor between which said short-circuit-side internal conductor pattern is disposed.
Claim 6
Dependent Claim
225 words
A laminated dielectric filter comprising: a block-shaped dielectric material made up of a plurality of sheets laminated; a plurality of in-resonator conductors formed in said block-shaped dielectric material in spaced apart relationship in a pattern-width direction; each of said in-resonator conductors including a short-circuit-side internal conductor pattern and an open-end-side internal conductor pattern which are opposed to each other in spaced apart relationship in a pattern-thickness direction, as well as a via connection part which connects one end of said short-circuit-side internal conductor pattern to one end of said open-end-side internal conductor pattern; an external grounding conductor formed on an external surface of said dielectric material in such a manner as to be connected to the other end of said short-circuit-side internal conductor pattern but not to the other end of said open-end-side internal conductor pattern; and an internal grounding conductor provided between said internal conductor patterns formed in said dielectric material, said internal grounding conductor being connected to said external grounding conductor but not to said via connection part, thereby forming a folded microstrip line type resonator structure, wherein the distance between said internal grounding conductor and said external grounding conductor between which said open-end-side internal conductor pattern is disposed is shorter than the distance between said internal grounding conductor and said external grounding conductor between which said short-circuit-side internal conductor pattern is disposed.
Claim 7
Dependent Claim
30 words
A laminated dielectric filter according to claim 4, wherein said plurality of in-resonator conductors constitute a comb-line structure in which said via connection parts are positioned on the same side.
Claim 8
Dependent Claim
30 words
A laminated dielectric filter according to claim 4, wherein said plurality of in-resonator conductors constitute an interdigital structure in which said via connection parts are alternately positioned on opposite sides.
Claim 9
Dependent Claim
88 words
A dielectric filter comprising: a dielectric block body formed by a plurality of dielectric blocks disposed in lamination; an in-resonator conductor formed in a folded state between said plurality of dielectric blocks; a grounding pattern disposed inward of a folded portion of said folded in-resonator conductor in the state of being superposed in part over said folded in-resonator conductor, at a position spaced a predetermined distance apart from said folded portion in a thickness direction; and a communication part provided in a predetermined portion of said grounding pattern.
Claim 10
Dependent Claim
88 words
A dielectric filter comprising: a dielectric block body formed by a plurality of dielectric blocks disposed in lamination; an in-resonator conductor formed in a folded state between said plurality of dielectric blocks; a grounding pattern disposed inward of a folded portion of said folded in-resonator conductor in the state of being superposed in part over said folded in-resonator conductor, at a position spaced a predetermined distance apart from said folded portion in a thickness direction; and a communication part provided in a predetermined portion of said grounding pattern.
Claim 11
Dependent Claim
29 words
A dielectric filter according to claim 7, wherein said communication part is formed in a portion of said grounding pattern which excludes a portion superposed on said in-resonator conductor.
Claim 12
Dependent Claim
92 words
A dielectric filter according to claim 7, wherein said grounding pattern is made up of a plurality of auxiliary grounding patterns spaced a predetermined distance apart from each other in a thickness direction and disposed to be held at the same potential, each of said auxiliary grounding patterns having a removed portion formed by removing a predetermined portion, said auxiliary grounding patterns being superposed on each other in such a manner that said removed portion of either of said auxiliary grounding patterns is covered by a pattern portion of any other one.
Claim 13
Dependent Claim
25 words
A dielectric filter according to claim 9, wherein said plurality of auxiliary grounding patterns are electrically connected to each other via a conductive through hole.
Claim 14
Dependent Claim
17 words
A dielectric filter according to claim 7, wherein said communication part is made from a through hole.
Claim 15
Dependent Claim
16 words
A dielectric filter according to claim 7, wherein said communication part is made from a cutout.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-04-14 | 2000-10-14 | 2001-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-14 | 2004-10-14 | 2005-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-14 | 2008-10-14 | 2009-04-15 | $7700.00 | Window Closed / Lapsed |