US5448209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated dielectric filter
Assignee: NGK Insulators Ltd
•
Filing: 1994-03-29
•
Granted: 1995-09-05
•
Expires: 2014-03-29
Abstract
Abstract A laminated dielectric filter has a plurality of resonant elements disposed on a dielectric layer which constitute quarter-wave stripline resonators, respectively. The resonant elements have ends connected to a ground electrode. The dielectric layer also supports a plurality of electrodes having ends connected to the ground electrode and opposite ends spaced from and confronting respective open ends of the resonant elements. The laminated dielectric filter has another dielectric layer which supports thereon an electrode positioned in overlapping relationship to the resonant elements. Still another dielectric layer supports an input electrode positioned in overlapping relationship to the resonant elements and the electrode on the other dielectric layer and an output electrode positioned in overlapping relationship to the resonant elements and the electrode on the other dielectric layer. The laminated dielectric filter provides an attenuation pole to improve attenuation characteristics, suffers less variation of frequency at the pole, and can easily be reduced in size.
Inventors
- 👤 Takami Hirai
- 👤 Tatsumi Sugiura
- 👤 Shinsuke Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:44
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20345
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A laminated dielectric filter comprising: a dielectric body; at least one around electrode provided on an outer surface of said dielectric body; a first resonant element disposed in said dielectric body and having a first main surface and a second main surface opposite each other; a second resonant element disposed in said dielectric body and having a first main surface and a second main surface opposite each other; a first electrode disposed in said dielectric body in confronting relationship to a portion of said first main surface of said first resonant element and a portion of said first main surface of said second resonant element; and a second electrode disposed in said dielectric body in confronting relationship to a portion of said second main surface of said first resonant element and a portion of said first electrode, such that a capacitance is formed between said second electrode and said first electrode.
Claim 2
Dependent Claim
151 words
A laminated dielectric filter comprising: a dielectric body; at least one around electrode provided on an outer surface of said dielectric body; a first resonant element disposed in said dielectric body and having a first main surface and a second main surface opposite each other; a second resonant element disposed in said dielectric body and having a first main surface and a second main surface opposite each other; a first electrode disposed in said dielectric body in confronting relationship to a portion of said first main surface of said first resonant element and a portion of said first main surface of said second resonant element; and a second electrode disposed in said dielectric body in confronting relationship to a portion of said second main surface of said first resonant element and a portion of said first electrode, such that a capacitance is formed between said second electrode and said first electrode.
Claim 3
Dependent Claim
41 words
A laminated dielectric filter according to claim 1, further comprising a third electrode disposed in said dielectric body in confronting relationship to a portion of said second main surface of said second resonant element and a portion of said first electrode.
Claim 4
Dependent Claim
66 words
A laminated dielectric filter according to claim 2, further comprising a third resonant element disposed in said dielectric body on a side of said second resonant element opposite to said first resonant element, said third resonant element having a first main surface and a second main surface opposite each other, said third electrode confronting a portion of said second main surface of said third resonant element.
Claim 5
Dependent Claim
41 words
A laminated dielectric filter according to claim 3, further comprising a fourth electrode disposed in said dielectric body in confronting relationship to a portion of said first main surface of said third resonant element and a portion of said third electrode.
Claim 6
Dependent Claim
22 words
A laminated dielectric filter according to claim 1, wherein said second electrode is used as an input electrode or an output electrode.
Claim 7
Dependent Claim
37 words
A laminated dielectric filter according to claim 2, wherein said second electrode is used as an input electrode or an output electrode, and said third electrode is used as the other of the input and output electrodes.
Claim 8
Dependent Claim
37 words
A laminated dielectric filter according to claim 4, wherein said second electrode is used as an input electrode or an output electrode, and said fourth electrode is used as the other of the input and output electrodes.
Claim 9
Dependent Claim
32 words
A laminated dielectric filter according to claim 1, wherein said at least one ground electrode includes a pair of mutually electrically interconnected ground electrodes provided on respective sides of said dielectric body.
Claim 10
Dependent Claim
54 words
A laminated dielectric filter according to claim 1, wherein said second electrode extends from a side of the dielectric body and beyond the first resonant element, the portion of the second electrode which extends beyond the first resonant element being in confronting relationship to said first electrode, such that the capacitance is formed therebetween.
References Cited (Backward Citations)
US4418324A
Cited
JPS61258503A
Cited
US4692726A
Cited
JPS63224502A
Cited
JPH0262101A
Cited
US4963843A
Cited
EP0506476A1
Cited
US5332984A
Cited
JPH05251905A
Cited
JPH0677704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-04 | 2003-03-06 | 2003-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-04 | 2007-03-06 | 2007-09-05 | $7700.00 | Window Closed / Lapsed |